Dequalinium

Identification

Summary

Dequalinium is a quaternary ammonium cation antimicrobial agent used to treat common infections of the mouth and throat, as well as vaginal candidiasis.

Generic Name
Dequalinium
DrugBank Accession Number
DB04209
Background

Dequalinium is an antibacterial agent with multi-targeted actions. It also possesses antifungal, antiparasitic, antiviral, anticancer, and neuroprotective properties.9 It is a quaternary ammonium compound,10 as it consists of an amphipathic cation with two aminoquinaldinium rings at both ends of a long hydrophobic hydrocarbon chain. Due to its flexible structure, dequalinium was investigated to build drug and gene delivery systems.9

First used as an antiseptic and disinfectant in the 1950s, dequalinium is still found in various OTC products to treat conditions of oral infections and inflammation.9 It is also used in vaginal tablets to treat bacterial vaginosis.10

Type
Small Molecule
Groups
Approved, Investigational
Structure
Weight
Average: 456.6654
Monoisotopic: 456.3252973
Chemical Formula
C30H40N4
Synonyms
  • 1,1'-(1,10-Decanediyl)bis(4-amino-2-methylquinolinium) dichloride
  • 1,1'-Decamethylenebis(4-aminoquinaldinium chloride)
  • Decamethylenebis(4-aminoquinaldinium chloride)
External IDs
  • LSM-5846

Pharmacology

Indication

Dequalinium is used in several OTC products to treat mouth infections and inflammation, such as tonsillitis, pharyngitis, and gingivitis.9 As vaginal tablets, dequalinium is indicated for the treatment of bacterial vaginosis in adult women under 55 years of age.10

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Associated Conditions
Indication TypeIndicationCombined Product DetailsApproval LevelAge GroupPatient CharacteristicsDose Form
Treatment ofBacterial vaginosis (bv)•••••••••••••••••••••••
Used in combination for symptomatic treatment ofBreath odourCombination Product in combination with: Benzalkonium (DB11105)••• •••••••••••
Used in combination to treatGingivitisCombination Product in combination with: Benzalkonium (DB11105)••• •••••••••••
Treatment ofInflammation of mouth••• •••
Used in combination to treatInflammation of mouthCombination Product in combination with: Benzalkonium (DB11105)••• •••••••••••
Associated Therapies
Contraindications & Blackbox Warnings
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Pharmacodynamics

In vitro, dequalinium possesses antimicrobial activity against gram-positive and gram-negative bacteria, yeasts, and protozoa.6 Dequalinium has a rapid bactericidal and fungicidal action.1 The antiparasitic and antiviral properties of dequalinium have also been noted. For example, dequalinium can bind to the membrane-proximal external region (MPER) of the spike envelope of the human immunodeficiency virus HIV-1.9

As with other quaternary ammonium compounds similar to dequalinium, gram-positive bacteria are more sensitive to dequalinium than gram-negative bacteria.6,10 The bactericidal and fungicidal effects of dequalinium can occur within 30 to 60 minutes.7 According to in vitro studies, the minimal inhibitory concentration (MIC) for dequalinium against relevant vaginal pathogens ranges from 0.2 to ≥ 1024 µg/mL.10

There is evidence that dequalinium exhibits anticancer activity in human leukemia cells: dequalinium induces a cytotoxic effect by altering redox balance, downregulating Raf/MEK/ERK1/2 and PI3K/Akt signalling pathways, and promoting apoptosis of leukemic cells.3,4,5 Dequalinium was also shown to block small conductance Ca2+-activated K+ channels, called SK channels, which are often expressed in some cancer cells to play a role in cell proliferation and migration.9 One study showed that dequalinium reduced macrophage motility in mice, inhibiting macrophage infiltration of irradiated tumours and attenuating local metastasis.2

Interestingly, dequalinium was shown to modulate and induce self-oligomerization of alpha-synuclein, a synaptic protein known to cause aggregates in several neurodegenerative disorders. This finding highlights the neuroprotective actions of dequalinium; however, further investigations are warranted as dequalinium is a neurotoxic agent.9

Mechanism of action

Dequalinium has multiple modes of action. Dequalinium absorbs into the bacterial cell surface and diffuses through the cell wall, disrupting bacterial cell permeability.6,9 It is taken up by the bacteria rapidly.9 Once in the bacteria, dequalinium denatures proteins involved in the respiratory chain and glycolysis of bacteria, interfering with bacterial cell metabolism and ribosomal protein synthesis.1,6,9 By inhibiting bacterial F1-ATPase, dequalinium inhibits mitochondrial ATP synthesis and blocks glucose metabolism. These molecular actions ultimately deplete bacterial energy sources.1 As dequalinium accumulates in the mitochondria, it is considered a mitochondrial poison.8,9

Dequalinium can also precipitate nucleic acids, as it can intercalate one of its quinoline chromophores between DNA base pairs.1,9 Depending on the drug concentration, dequalinium can lyse the bacterial cell by promoting osmotic imbalance.1,6

TargetActionsOrganism
ASmall conductance calcium-activated potassium channel protein 1
blocker
Humans
ACyclic nucleotide-gated channel alpha-2
blocker
Humans
ASmall conductance calcium-activated potassium channel protein 2
blocker
Humans
AE3 ubiquitin-protein ligase XIAP
antagonist
inhibitor
Humans
ACyclic nucleotide-gated channel alpha-1
blocker
Humans
ASmall conductance calcium-activated potassium channel protein 3
blocker
Humans
UCalcium-activated potassium channel subunit alpha-1
inhibitor
Humans
UHTH-type transcriptional regulator QacR
regulator
Staphylococcus aureus
UResponse regulator RamR
regulator
Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)
UProtein kinase C
inhibitor
Humans
UAlpha-synuclein
modulator
Humans
UL-cysteine:1D-myo-inositol 2-amino-2-deoxy-alpha-D-glucopyranoside ligase
inhibitor
Mycobacterium tuberculosis (strain ATCC 25177 / H37Ra)
UCalmodulin
antagonist
Humans
Absorption

Following vaginal administration, dequalinium is not readily absorbed into the systemic circulation. The concentration of dequalinium chloride in vaginal fluid was 2000 to 4000 mg/L in vitro after dissolution of one vaginal tablet (equivalent of 10 mg dequalinium chloride) in an estimated 2.5 to 5 mg/L of vaginal fluid.10

Volume of distribution

There is no information available.

Protein binding

There is no information available.

Metabolism

There is no information available.

Route of elimination

There is no information available.

Half-life

There is no information available.

Clearance

There is no information available.

Adverse Effects
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Toxicity

The LD50 was 18300 ug/kg following intraperitoneal administration and 70 mg/kg following subcutaneous administration in mice.11 There is limited clinical experience of drug overdose with dequalinium. While dequalinium is generally well tolerated and considered as safe at recommended therapeutic doses, dequalinium is a neurotoxic agent and mitochondrial poison. At a high dose in mice, the drug caused damages to the liver and kidneys, and caused renal and hepatic failure.9

Pathways
Not Available
Pharmacogenomic Effects/ADRs
Not Available

Interactions

Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
DrugInteraction
AcenocoumarolThe risk or severity of bleeding can be increased when Dequalinium is combined with Acenocoumarol.
AmbroxolThe risk or severity of methemoglobinemia can be increased when Dequalinium is combined with Ambroxol.
ArticaineThe risk or severity of methemoglobinemia can be increased when Dequalinium is combined with Articaine.
BCG vaccineThe therapeutic efficacy of BCG vaccine can be decreased when used in combination with Dequalinium.
Benzyl alcoholThe risk or severity of methemoglobinemia can be increased when Dequalinium is combined with Benzyl alcohol.
Food Interactions
No interactions found.

Products

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Product Ingredients
IngredientUNIICASInChI Key
Dequalinium acetateP8W4UX112S4028-98-2IWYNVAJACBPVLT-UHFFFAOYSA-N
Dequalinium bromideNot AvailableNot AvailableNot applicable
Dequalinium chlorideXYS8INN1I6522-51-0LTNZEXKYNRNOGT-UHFFFAOYSA-N
Dequalinium iodideNot AvailableNot AvailableNot applicable
Dequalinium undecenoateNot AvailableNot AvailableNot applicable
Brand Name Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
VablysTablet10 mgVaginalDuchesnay Inc.2022-05-17Not applicableCanada flag
Over the Counter Products
NameDosageStrengthRouteLabellerMarketing StartMarketing EndRegionImage
AXCEL DEXXON LOZENGESLozengeOralKOTRA PHARMA (M) SDN. BHD.2020-09-08Not applicableMalaysia flag
Citrex DQM Lozenges Lemon Ginger 0.25mgLozenge0.25 mgOralIDAMAN PHARMA MANUFACTURING SDN BHD2020-09-082021-12-12Malaysia flag
Citrex DQM Lozenges Lemon Honey 0.25mgLozenge0.25 mgOralIDAMAN PHARMA MANUFACTURING SDN BHD2020-09-082024-02-24Malaysia flag
Citrex DQM Lozenges Orange 0.25mgLozenge0.25 mgOralIDAMAN PHARMA MANUFACTURING SDN BHD2020-09-082024-02-24Malaysia flag
DELINLozenge0.25 mgOralบริษัท โรงงานเภสัชกรรมแอตแลนติค จำกัด2020-06-22Not applicableThailand flag
Mixture Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing EndRegionImage
BUCOSEPTOL® TABLETASDequalinium chloride (0.25 mg) + Benzocaine (15 mg)TabletOralLABORATORIOS NEOLTDA.2013-03-052013-05-23Colombia flag
CEQUALINDequalinium chloride (250 mcg) + Ascorbic acid (51.55 mg)LozengeOralErlangga Edi Laboratories (Erela)2018-03-292025-02-01Indonesia flag
DECATYLEN LOZENGEDequalinium chloride (0.25 mg) + Cinchocaine hydrochloride (0.03 mg)LozengeOralAPEX PHARMA MARKETING PTE. LTD.1990-06-25Not applicableSingapore flag
DECATYLEN LOZENGESDequalinium chloride (0.25 mg) + Cinchocaine hydrochloride (0.03 mg)LozengeOralMEPHARM (MALAYSIA) SDN. BHD.2020-09-082024-06-28Malaysia flag
DEQ LOZENGEDequalinium chloride (0.25 mg) + Tyrothricin (1 mg)LozengeOralATLANTIC LABORATORIES (M) SDN. BHD.2020-09-082024-06-28Malaysia flag

Categories

ATC Codes
D08AH01 — DequaliniumR02AA02 — DequaliniumG01AC05 — Dequalinium
Drug Categories
Chemical TaxonomyProvided by Classyfire
Description
This compound belongs to the class of organic compounds known as 4-aminoquinolines. These are organic compounds containing an amino group attached to the 4-position of a quinoline ring system.
Kingdom
Organic compounds
Super Class
Organoheterocyclic compounds
Class
Quinolines and derivatives
Sub Class
Aminoquinolines and derivatives
Direct Parent
4-aminoquinolines
Alternative Parents
Methylpyridines / Aminopyridines and derivatives / Pyridinium derivatives / Benzenoids / Heteroaromatic compounds / Azacyclic compounds / Primary amines / Organopnictogen compounds / Hydrocarbon derivatives / Organic cations
Substituents
4-aminoquinoline / Amine / Aminopyridine / Aromatic heteropolycyclic compound / Azacycle / Benzenoid / Heteroaromatic compound / Hydrocarbon derivative / Methylpyridine / Organic cation
Molecular Framework
Aromatic heteropolycyclic compounds
External Descriptors
quinolinium ion (CHEBI:41872)
Affected organisms
  • Candida albicans and other yeasts
  • Trichomonas vaginalis, Giardia duodenalis, and Entamoeba histolytica
  • Bacteria and protozoa
  • Bacteroides
  • Peptostreptococcus

Chemical Identifiers

UNII
E7QC7V26B8
CAS number
6707-58-0
InChI Key
PCSWXVJAIHCTMO-UHFFFAOYSA-P
InChI
InChI=1S/C30H38N4/c1-23-21-27(31)25-15-9-11-17-29(25)33(23)19-13-7-5-3-4-6-8-14-20-34-24(2)22-28(32)26-16-10-12-18-30(26)34/h9-12,15-18,21-22,31-32H,3-8,13-14,19-20H2,1-2H3/p+2
IUPAC Name
4-amino-1-[10-(4-amino-2-methylquinolin-1-ium-1-yl)decyl]-2-methylquinolin-1-ium
SMILES
CC1=CC(N)=C2C=CC=CC2=[N+]1CCCCCCCCCC[N+]1=C(C)C=C(N)C2=C1C=CC=C2

References

General References
  1. Mendling W, Weissenbacher ER, Gerber S, Prasauskas V, Grob P: Use of locally delivered dequalinium chloride in the treatment of vaginal infections: a review. Arch Gynecol Obstet. 2016 Mar;293(3):469-84. doi: 10.1007/s00404-015-3914-8. Epub 2015 Oct 27. [Article]
  2. Timaner M, Bril R, Kaidar-Person O, Rachman-Tzemah C, Alishekevitz D, Kotsofruk R, Miller V, Nevelsky A, Daniel S, Raviv Z, Rotenberg SA, Shaked Y: Dequalinium blocks macrophage-induced metastasis following local radiation. Oncotarget. 2015 Sep 29;6(29):27537-54. doi: 10.18632/oncotarget.4826. [Article]
  3. Sancho P, Galeano E, Estan MC, Ganan-Gomez I, Boyano-Adanez Mdel C, Garcia-Perez AI: Raf/MEK/ERK signaling inhibition enhances the ability of dequalinium to induce apoptosis in the human leukemic cell line K562. Exp Biol Med (Maywood). 2012 Aug;237(8):933-42. doi: 10.1258/ebm.2012.011423. Epub 2012 Aug 8. [Article]
  4. Garcia-Perez AI, Galeano E, Nieto E, Sancho P: Dequalinium induces human leukemia cell death by affecting the redox balance. Leuk Res. 2011 Oct;35(10):1395-401. doi: 10.1016/j.leukres.2011.03.012. Epub 2011 Apr 8. [Article]
  5. Garcia-Perez AI, Galeano E, Nieto E, Estan MC, Sancho P: Dequalinium induces cytotoxicity in human leukemia NB4 cells by downregulation of Raf/MEK/ERK and PI3K/Akt signaling pathways and potentiation of specific inhibitors of these pathways. Leuk Res. 2014 Jul;38(7):795-803. doi: 10.1016/j.leukres.2014.01.009. Epub 2014 Jan 28. [Article]
  6. Della Casa V, Noll H, Gonser S, Grob P, Graf F, Pohlig G: Antimicrobial activity of dequalinium chloride against leading germs of vaginal infections. Arzneimittelforschung. 2002;52(9):699-705. [Article]
  7. D'Auria FD, Simonetti G, Strippoli V: [Antimicrobial characteristics of a tincture of dequalinium chloride]. Ann Ig. 1989 Sep-Oct;1(5):1227-41. [Article]
  8. Weiss MJ, Wong JR, Ha CS, Bleday R, Salem RR, Steele GD Jr, Chen LB: Dequalinium, a topical antimicrobial agent, displays anticarcinoma activity based on selective mitochondrial accumulation. Proc Natl Acad Sci U S A. 1987 Aug;84(15):5444-8. [Article]
  9. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]
  10. Health Canada Approved Drug Products: VABLYS (Dequalinium) Vaginal Tablets [Link]
  11. Cayman Chemical: Dequalinium MSDS [Link]
PubChem Compound
2993
PubChem Substance
46507206
ChemSpider
2886
BindingDB
50048403
RxNav
3226
ChEBI
41872
ChEMBL
CHEMBL333826
ZINC
ZINC000001655706
Guide to Pharmacology
GtP Drug Page
PDBe Ligand
DEQ
Drugs.com
Drugs.com Drug Page
Wikipedia
Dequalinium
PDB Entries
1jt6 / 1oyd / 3arp / 3art / 3br1 / 3br2 / 3bt9 / 3btj / 3vw0

Clinical Trials

Clinical Trials
Clinical Trial & Rare Diseases Add-on Data Package
Explore 4,000+ rare diseases, orphan drugs & condition pairs, clinical trial why stopped data, & more. Preview package
PhaseStatusPurposeConditionsCountStart DateWhy Stopped100+ additional columns
Not AvailableCompletedNot AvailableBacterial Vaginoses1somestatusstop reasonjust information to hide
4CompletedTreatmentVulvovaginal Candidiasis1somestatusstop reasonjust information to hide
4TerminatedTreatmentBacterial Vaginosis (BV) / Vaginal Diseases / Vaginal Infections1somestatusstop reasonjust information to hide
3CompletedTreatmentBacterial Vaginosis (BV)1somestatusstop reasonjust information to hide

Pharmacoeconomics

Manufacturers
Not Available
Packagers
Not Available
Dosage Forms
FormRouteStrength
TabletOral
TabletOral
LozengeOral0254 MG
LozengeOral0.25 mg
TabletOral0.25 mg
LozengeOral
LozengeOral250 mcg
SolutionOral
SprayOral
LozengeOral.25 mg / loz
SolutionBuccal0.5 % w/v
LiquidOral0.5 %
TabletOral0.25 mg
SolutionOral
InsertVaginal10 mg
SolutionTopical5 mg/mL
LozengeOral25 mg
OintmentTopical
TabletVaginal
TabletVaginal10 mg
PastilleOral
PastilleOral
TabletVaginal10.000 mg
LozengeOral
SolutionOral1 mg/10ml
LozengeOral0.25 mg
Prices
Not Available
Patents
Patent NumberPediatric ExtensionApprovedExpires (estimated)Region
US4946849No1990-08-072002-10-01US flag

Properties

State
Solid
Experimental Properties
PropertyValueSource
boiling point (°C)300https://datasheets.scbt.com/sds/aghs/en/sc-214869.pdf
Predicted Properties
PropertyValueSource
Water Solubility4.77e-07 mg/mLALOGPS
logP0.16ALOGPS
logP-3.6Chemaxon
logS-9ALOGPS
pKa (Strongest Basic)-0.34Chemaxon
Physiological Charge2Chemaxon
Hydrogen Acceptor Count2Chemaxon
Hydrogen Donor Count2Chemaxon
Polar Surface Area59.8 Å2Chemaxon
Rotatable Bond Count11Chemaxon
Refractivity147 m3·mol-1Chemaxon
Polarizability56.76 Å3Chemaxon
Number of Rings4Chemaxon
Bioavailability1Chemaxon
Rule of FiveYesChemaxon
Ghose FilterNoChemaxon
Veber's RuleNoChemaxon
MDDR-like RuleYesChemaxon
Predicted ADMET Features
PropertyValueProbability
Human Intestinal Absorption+0.5208
Blood Brain Barrier+0.924
Caco-2 permeable+0.5756
P-glycoprotein substrateSubstrate0.6725
P-glycoprotein inhibitor INon-inhibitor0.7203
P-glycoprotein inhibitor IIInhibitor0.7281
Renal organic cation transporterInhibitor0.6769
CYP450 2C9 substrateNon-substrate0.8745
CYP450 2D6 substrateNon-substrate0.5072
CYP450 3A4 substrateNon-substrate0.5434
CYP450 1A2 substrateNon-inhibitor0.6703
CYP450 2C9 inhibitorNon-inhibitor0.9119
CYP450 2D6 inhibitorInhibitor0.8931
CYP450 2C19 inhibitorNon-inhibitor0.9026
CYP450 3A4 inhibitorInhibitor0.6677
CYP450 inhibitory promiscuityHigh CYP Inhibitory Promiscuity0.5512
Ames testAMES toxic0.5875
CarcinogenicityNon-carcinogens0.9063
BiodegradationNot ready biodegradable0.9969
Rat acute toxicity2.6736 LD50, mol/kg Not applicable
hERG inhibition (predictor I)Weak inhibitor0.823
hERG inhibition (predictor II)Inhibitor0.9123
ADMET data is predicted using admetSAR, a free tool for evaluating chemical ADMET properties. (23092397)

Spectra

Mass Spec (NIST)
Not Available
Spectra
SpectrumSpectrum TypeSplash Key
Predicted 1H NMR Spectrum1D NMRNot Applicable
Predicted 13C NMR Spectrum1D NMRNot Applicable
Chromatographic Properties
Collision Cross Sections (CCS)
AdductCCS Value (Å2)Source typeSource
[M-H]-247.722742
predicted
DarkChem Lite v0.1.0
[M-H]-210.51427
predicted
DeepCCS 1.0 (2019)
[M+H]+250.236742
predicted
DarkChem Lite v0.1.0
[M+H]+212.87224
predicted
DeepCCS 1.0 (2019)
[M+Na]+247.766642
predicted
DarkChem Lite v0.1.0
[M+Na]+218.9654
predicted
DeepCCS 1.0 (2019)

Targets

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insights and accelerate drug research.
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Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Blocker
General Function
Small conductance calcium-activated potassium channel that mediates the voltage-independent transmembrane transfer of potassium across the cell membrane through a constitutive interaction with calmodulin which binds the intracellular calcium allowing its opening (PubMed:17142458, PubMed:8781233, PubMed:9287325). The current is characterized by a voltage-independent activation, an intracellular calcium concentration increase-dependent activation and a single-channel conductance of about 3 picosiemens (PubMed:8781233). Also presents an inwardly rectifying current, thus reducing its already small outward conductance of potassium ions, which is particularly the case when the membrane potential displays positive values, above + 20 mV (Probable). Activation is followed by membrane hyperpolarization (By similarity). Thought to regulate neuronal excitability by contributing to the slow component of synaptic afterhyperpolarization (By similarity)
Specific Function
calcium-activated potassium channel activity
Gene Name
KCNN1
Uniprot ID
Q92952
Uniprot Name
Small conductance calcium-activated potassium channel protein 1
Molecular Weight
59986.87 Da
References
  1. Zhou Y, Zhang Y, Zhao D, Yu X, Shen X, Zhou Y, Wang S, Qiu Y, Chen Y, Zhu F: TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res. 2024 Jan 5;52(D1):D1465-D1477. doi: 10.1093/nar/gkad751. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Blocker
General Function
Pore-forming subunit of the olfactory cyclic nucleotide-gated channel. Operates in the cilia of olfactory sensory neurons where chemical stimulation of the odorant is converted to an electrical signal. Mediates odorant-induced cAMP-dependent Ca(2+) influx triggering neuron depolarization. The rise of intracellular Ca(2+) levels potentiates the olfactory response by activating Ca(2+)-dependent Cl(-) channels, but it also serves as a negative feedback signal to desensitize the channel for rapid adaptation to odorants. Conducts cAMP- and cGMP-gated ion currents, with permeability for monovalent and divalent cations
Specific Function
calcium channel activity
Gene Name
CNGA2
Uniprot ID
Q16280
Uniprot Name
Cyclic nucleotide-gated channel alpha-2
Molecular Weight
76047.505 Da
References
  1. Zhou Y, Zhang Y, Zhao D, Yu X, Shen X, Zhou Y, Wang S, Qiu Y, Chen Y, Zhu F: TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res. 2024 Jan 5;52(D1):D1465-D1477. doi: 10.1093/nar/gkad751. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Blocker
General Function
Small conductance calcium-activated potassium channel that mediates the voltage-independent transmembrane transfer of potassium across the cell membrane through a constitutive interaction with calmodulin which binds the intracellular calcium allowing its opening (PubMed:10991935, PubMed:33242881, PubMed:9287325). The current is characterized by a voltage-independent activation, an intracellular calcium concentration increase-dependent activation and a single-channel conductance of about 3 picosiemens (PubMed:10991935). Also presents an inwardly rectifying current, thus reducing its already small outward conductance of potassium ions, which is particularly the case when the membrane potential displays positive values, above + 20 mV (PubMed:10991935). The inward rectification could be due to a blockade of the outward current by intracellular divalent cations such as calcium and magnesium and could also be due to an intrinsic property of the channel pore, independent of intracellular divalent ions. There are three positively charged amino acids in the S6 transmembrane domain, close to the pore, that collectively control the conductance and rectification through an electrostatic mechanism. Additionally, electrostatic contributions from these residues also play an important role in determining the intrinsic open probability of the channel in the absence of calcium, affecting the apparent calcium affinity for activation. Forms an heteromeric complex with calmodulin, which is constitutively associated in a calcium-independent manner. Channel opening is triggered when calcium binds the calmodulin resulting in a rotary movement leading to the formation of the dimeric complex to open the gate (By similarity). Plays a role in the repolarization phase of cardiac action potential (PubMed:13679367)
Specific Function
alpha-actinin binding
Gene Name
KCNN2
Uniprot ID
Q9H2S1
Uniprot Name
Small conductance calcium-activated potassium channel protein 2
Molecular Weight
63759.03 Da
References
  1. Zhou Y, Zhang Y, Zhao D, Yu X, Shen X, Zhou Y, Wang S, Qiu Y, Chen Y, Zhu F: TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res. 2024 Jan 5;52(D1):D1465-D1477. doi: 10.1093/nar/gkad751. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Antagonist
Inhibitor
General Function
Multi-functional protein which regulates not only caspases and apoptosis, but also modulates inflammatory signaling and immunity, copper homeostasis, mitogenic kinase signaling, cell proliferation, as well as cell invasion and metastasis (PubMed:11257230, PubMed:11257231, PubMed:11447297, PubMed:12121969, PubMed:12620238, PubMed:17560374, PubMed:17967870, PubMed:19473982, PubMed:20154138, PubMed:22103349, PubMed:9230442). Acts as a direct caspase inhibitor (PubMed:11257230, PubMed:11257231, PubMed:12620238). Directly bind to the active site pocket of CASP3 and CASP7 and obstructs substrate entry (PubMed:11257230, PubMed:11257231, PubMed:16352606, PubMed:16916640). Inactivates CASP9 by keeping it in a monomeric, inactive state (PubMed:12620238). Acts as an E3 ubiquitin-protein ligase regulating NF-kappa-B signaling and the target proteins for its E3 ubiquitin-protein ligase activity include: RIPK1, RIPK2, MAP3K2/MEKK2, DIABLO/SMAC, AIFM1, CCS, PTEN and BIRC5/survivin (PubMed:17560374, PubMed:17967870, PubMed:19473982, PubMed:20154138, PubMed:22103349, PubMed:22607974, PubMed:29452636, PubMed:30026309). Acts as an important regulator of innate immunity by mediating 'Lys-63'-linked polyubiquitination of RIPK2 downstream of NOD1 and NOD2, thereby transforming RIPK2 into a scaffolding protein for downstream effectors, ultimately leading to activation of the NF-kappa-B and MAP kinases signaling (PubMed:19667203, PubMed:22607974, PubMed:29452636, PubMed:30026309). 'Lys-63'-linked polyubiquitination of RIPK2 also promotes recruitment of the LUBAC complex to RIPK2 (PubMed:22607974, PubMed:29452636). Regulates the BMP signaling pathway and the SMAD and MAP3K7/TAK1 dependent pathways leading to NF-kappa-B and JNK activation (PubMed:17560374). Ubiquitination of CCS leads to enhancement of its chaperone activity toward its physiologic target, SOD1, rather than proteasomal degradation (PubMed:20154138). Ubiquitination of MAP3K2/MEKK2 and AIFM1 does not lead to proteasomal degradation (PubMed:17967870, PubMed:22103349). Plays a role in copper homeostasis by ubiquitinating COMMD1 and promoting its proteasomal degradation (PubMed:14685266). Can also function as E3 ubiquitin-protein ligase of the NEDD8 conjugation pathway, targeting effector caspases for neddylation and inactivation (PubMed:21145488). Ubiquitinates and therefore mediates the proteasomal degradation of BCL2 in response to apoptosis (PubMed:29020630). Protects cells from spontaneous formation of the ripoptosome, a large multi-protein complex that has the capability to kill cancer cells in a caspase-dependent and caspase-independent manner (PubMed:22095281). Suppresses ripoptosome formation by ubiquitinating RIPK1 and CASP8 (PubMed:22095281). Acts as a positive regulator of Wnt signaling and ubiquitinates TLE1, TLE2, TLE3, TLE4 and AES (PubMed:22304967). Ubiquitination of TLE3 results in inhibition of its interaction with TCF7L2/TCF4 thereby allowing efficient recruitment and binding of the transcriptional coactivator beta-catenin to TCF7L2/TCF4 that is required to initiate a Wnt-specific transcriptional program (PubMed:22304967)
Specific Function
cysteine-type endopeptidase inhibitor activity
Gene Name
XIAP
Uniprot ID
P98170
Uniprot Name
E3 ubiquitin-protein ligase XIAP
Molecular Weight
56684.41 Da
References
  1. Orzaez M, Gortat A, Sancho M, Carbajo RJ, Pineda-Lucena A, Palacios-Rodriguez Y, Perez-Paya E: Characterization of dequalinium as a XIAP antagonist that targets the BIR2 domain. Apoptosis. 2011 May;16(5):460-7. doi: 10.1007/s10495-011-0582-4. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Blocker
General Function
Pore-forming subunit of the rod cyclic nucleotide-gated channel. Mediates rod photoresponses at dim light converting transient changes in intracellular cGMP levels into electrical signals. In the dark, cGMP levels are high and keep the channel open enabling a steady inward current carried by Na(+) and Ca(2+) ions that leads to membrane depolarization and neurotransmitter release from synaptic terminals. Upon photon absorption cGMP levels decline leading to channel closure and membrane hyperpolarization that ultimately slows neurotransmitter release and signals the presence of light, the end point of the phototransduction cascade. Conducts cGMP- and cAMP-gated ion currents, with permeability for monovalent and divalent cations. The selectivity for Ca(2+) over Na(+) increases with cGMP concentrations, whereas the selectivity among monovalent ions is independent of the cGMP levels
Specific Function
calcium channel activity
Gene Name
CNGA1
Uniprot ID
P29973
Uniprot Name
Cyclic nucleotide-gated channel alpha-1
Molecular Weight
79125.225 Da
References
  1. Rosenbaum T, Islas LD, Carlson AE, Gordon SE: Dequalinium: a novel, high-affinity blocker of CNGA1 channels. J Gen Physiol. 2003 Jan;121(1):37-47. [Article]
  2. Zhou Y, Zhang Y, Zhao D, Yu X, Shen X, Zhou Y, Wang S, Qiu Y, Chen Y, Zhu F: TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res. 2024 Jan 5;52(D1):D1465-D1477. doi: 10.1093/nar/gkad751. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Yes
Actions
Blocker
General Function
Small conductance calcium-activated potassium channel that mediates the voltage-independent transmembrane transfer of potassium across the cell membrane through a constitutive interaction with calmodulin which binds the intracellular calcium allowing its opening (PubMed:12808432, PubMed:20562108, PubMed:31155282, PubMed:36502918). The current is characterized by a voltage-independent activation, an intracellular calcium concentration increase-dependent activation and a single-channel conductance of 10 picosiemens (PubMed:12808432, PubMed:20562108, PubMed:31155282, PubMed:36502918). Also presents an inwardly rectifying current, thus reducing its already small outward conductance of potassium ions, which is particularly the case when the membrane potential displays positive values, above + 20 mV (PubMed:12808432). Activation is followed by membrane hyperpolarization. Thought to regulate neuronal excitability by contributing to the slow component of synaptic afterhyperpolarization (By similarity)
Specific Function
calmodulin binding
Gene Name
KCNN3
Uniprot ID
Q9UGI6
Uniprot Name
Small conductance calcium-activated potassium channel protein 3
Molecular Weight
81384.63 Da
References
  1. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]
  2. Zhou Y, Zhang Y, Zhao D, Yu X, Shen X, Zhou Y, Wang S, Qiu Y, Chen Y, Zhu F: TTD: Therapeutic Target Database describing target druggability information. Nucleic Acids Res. 2024 Jan 5;52(D1):D1465-D1477. doi: 10.1093/nar/gkad751. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Inhibitor
General Function
Potassium channel activated by both membrane depolarization or increase in cytosolic Ca(2+) that mediates export of K(+) (PubMed:14523450, PubMed:29330545, PubMed:31152168). It is also activated by the concentration of cytosolic Mg(2+). Its activation dampens the excitatory events that elevate the cytosolic Ca(2+) concentration and/or depolarize the cell membrane. It therefore contributes to repolarization of the membrane potential. Plays a key role in controlling excitability in a number of systems, such as regulation of the contraction of smooth muscle, the tuning of hair cells in the cochlea, regulation of transmitter release, and innate immunity. In smooth muscles, its activation by high level of Ca(2+), caused by ryanodine receptors in the sarcoplasmic reticulum, regulates the membrane potential. In cochlea cells, its number and kinetic properties partly determine the characteristic frequency of each hair cell and thereby helps to establish a tonotopic map. Kinetics of KCNMA1 channels are determined by alternative splicing, phosphorylation status and its combination with modulating beta subunits. Highly sensitive to both iberiotoxin (IbTx) and charybdotoxin (CTX)
Specific Function
actin binding
Gene Name
KCNMA1
Uniprot ID
Q12791
Uniprot Name
Calcium-activated potassium channel subunit alpha-1
Molecular Weight
137558.115 Da
References
  1. Castle NA, Haylett DG, Morgan JM, Jenkinson DH: Dequalinium: a potent inhibitor of apamin-sensitive K+ channels in hepatocytes and of nicotinic responses in skeletal muscle. Eur J Pharmacol. 1993 May 19;236(2):201-7. [Article]
Kind
Protein
Organism
Staphylococcus aureus
Pharmacological action
Unknown
Actions
Regulator
General Function
Transcriptional repressor of qacA. Binds to IR1, an unusually long 28 bp operator, which is located downstream from the qacA promoter and overlaps its transcription start site. QacR is induced from its IR1 site by binding to one of many structurally dissimilar cationic lipophilic compounds, which are also substrates of QacA.
Specific Function
DNA binding
Gene Name
qacR
Uniprot ID
P0A0N4
Uniprot Name
HTH-type transcriptional regulator QacR
Molecular Weight
22174.175 Da
References
  1. Peters KM, Schuman JT, Skurray RA, Brown MH, Brennan RG, Schumacher MA: QacR-cation recognition is mediated by a redundancy of residues capable of charge neutralization. Biochemistry. 2008 Aug 5;47(31):8122-9. doi: 10.1021/bi8008246. Epub 2008 Jul 11. [Article]
  2. Murray DS, Schumacher MA, Brennan RG: Crystal structures of QacR-diamidine complexes reveal additional multidrug-binding modes and a novel mechanism of drug charge neutralization. J Biol Chem. 2004 Apr 2;279(14):14365-71. doi: 10.1074/jbc.M313870200. Epub 2004 Jan 15. [Article]
Kind
Protein
Organism
Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)
Pharmacological action
Unknown
Actions
Regulator
General Function
A transcription factor required for aerial hyphae formation on rich medium (PubMed:12100547, PubMed:12453210). Activates transcription of ramC. Might be part of a two-component regulatory system (PubMed:12453210). Binds the promoter of ramC (PubMed:12100547, PubMed:12453210). Non-phosphorylated protein cooperatively binds multiple sites in the ramC promoter. Has not been seen to autophosphorylate using the small molecule phosphodonors phosphoramidate, acetyl phosphate or carbamoyl phosphate (PubMed:16051268). Upon low expression suppresses the bald (bld, no aerial hyphae) phenotype of citA but not bldJ mutants; higher expression also suppresses the bldJ mutant as well as several other bld mutations, inducing SapB production even on media where SapB is normally not produced (PubMed:12453210). Expression of the ram locus (ramA, ramB and ramR) induces rapid aerial mycelium formation in S.lividans (PubMed:8206859). Overexpression suppresses the no aerial hyphae phenotype of a chaplin-negative strain, probably by inducing expression of SapB (PubMed:17462011). Overexpression of RamR show there are about 280 genes having at least a threefold increase or fourfold decrease in RNA abundance versus wild-type including gene cluster SCO4072-SCO4075 (PubMed:16925552).
Specific Function
DNA binding
Gene Name
ramR
Uniprot ID
Q7AKE4
Uniprot Name
Response regulator RamR
Molecular Weight
21489.545 Da
References
  1. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]
Kind
Protein group
Organism
Humans
Pharmacological action
Unknown
Actions
Inhibitor
General Function
Calcium-activated, phospholipid- and diacylglycerol (DAG)-dependent serine/threonine-protein kinase that is involved in positive and negative regulation of cell proliferation, apoptosis, differentiation, migration and adhesion, tumorigenesis, cardiac hypertrophy, angiogenesis, platelet function and inflammation, by directly phosphorylating targets such as RAF1, BCL2, CSPG4, TNNT2/CTNT, or activating signaling cascade involving MAPK1/3 (ERK1/2) and RAP1GAP. Involved in cell proliferation and cell growth arrest by positive and negative regulation of the cell cycle. Can promote cell growth by phosphorylating and activating RAF1, which mediates the activation of the MAPK/ERK signaling cascade, and/or by up-regulating CDKN1A, which facilitates active cyclin-dependent kinase (CDK) complex formation in glioma cells. In intestinal cells stimulated by the phorbol ester PMA, can trigger a cell cycle arrest program which is associated with the accumulation of the hyper-phosphorylated growth-suppressive form of RB1 and induction of the CDK inhibitors CDKN1A and CDKN1B. Exhibits anti-apoptotic function in glioma cells and protects them from apoptosis by suppressing the p53/TP53-mediated activation of IGFBP3, and in leukemia cells mediates anti-apoptotic action by phosphorylating BCL2. During macrophage differentiation induced by macrophage colony-stimulating factor (CSF1), is translocated to the nucleus and is associated with macrophage development. After wounding, translocates from focal contacts to lamellipodia and participates in the modulation of desmosomal adhesion. Plays a role in cell motility by phosphorylating CSPG4, which induces association of CSPG4 with extensive lamellipodia at the cell periphery and polarization of the cell accompanied by increases in cell motility. During chemokine-induced CD4(+) T cell migration, phosphorylates CDC42-guanine exchange factor DOCK8 resulting in its dissociation from LRCH1 and the activation of GTPase CDC42 (PubMed:28028151). Is highly expressed in a number of cancer cells where it can act as a tumor promoter and is implicated in malignant phenotypes of several tumors such as gliomas and breast cancers. Negatively regulates myocardial contractility and positively regulates angiogenesis, platelet aggregation and thrombus formation in arteries. Mediates hypertrophic growth of neonatal cardiomyocytes, in part through a MAPK1/3 (ERK1/2)-dependent signaling pathway, and upon PMA treatment, is required to induce cardiomyocyte hypertrophy up to heart failure and death, by increasing protein synthesis, protein-DNA ratio and cell surface area. Regulates cardiomyocyte function by phosphorylating cardiac troponin T (TNNT2/CTNT), which induces significant reduction in actomyosin ATPase activity, myofilament calcium sensitivity and myocardial contractility. In angiogenesis, is required for full endothelial cell migration, adhesion to vitronectin (VTN), and vascular endothelial growth factor A (VEGFA)-dependent regulation of kinase activation and vascular tube formation. Involved in the stabilization of VEGFA mRNA at post-transcriptional level and mediates VEGFA-induced cell proliferation. In the regulation of calcium-induced platelet aggregation, mediates signals from the CD36/GP4 receptor for granule release, and activates the integrin heterodimer ITGA2B-ITGB3 through the RAP1GAP pathway for adhesion. During response to lipopolysaccharides (LPS), may regulate selective LPS-induced macrophage functions involved in host defense and inflammation. But in some inflammatory responses, may negatively regulate NF-kappa-B-induced genes, through IL1A-dependent induction of NF-kappa-B inhibitor alpha (NFKBIA/IKBA). Upon stimulation with 12-O-tetradecanoylphorbol-13-acetate (TPA), phosphorylates EIF4G1, which modulates EIF4G1 binding to MKNK1 and may be involved in the regulation of EIF4E phosphorylation. Phosphorylates KIT, leading to inhibition of KIT activity. Phosphorylates ATF2 which promotes cooperation between ATF2 and JUN, activating transcription. Phosphorylates SOCS2 at 'Ser-52' facilitating its ubiquitination and proteasomal degradation (By similarity). Phosphorylates KLHL3 in response to angiotensin II signaling, decreasing the interaction between KLHL3 and WNK4 (PubMed:25313067). Phosphorylates and activates LRRK1, which phosphorylates RAB proteins involved in intracellular trafficking (PubMed:36040231)
Specific Function
ATP binding

Components:
References
  1. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]
Kind
Protein
Organism
Humans
Pharmacological action
Unknown
Actions
Modulator
General Function
Neuronal protein that plays several roles in synaptic activity such as regulation of synaptic vesicle trafficking and subsequent neurotransmitter release (PubMed:20798282, PubMed:26442590, PubMed:28288128, PubMed:30404828). Participates as a monomer in synaptic vesicle exocytosis by enhancing vesicle priming, fusion and dilation of exocytotic fusion pores (PubMed:28288128, PubMed:30404828). Mechanistically, acts by increasing local Ca(2+) release from microdomains which is essential for the enhancement of ATP-induced exocytosis (PubMed:30404828). Acts also as a molecular chaperone in its multimeric membrane-bound state, assisting in the folding of synaptic fusion components called SNAREs (Soluble NSF Attachment Protein REceptors) at presynaptic plasma membrane in conjunction with cysteine string protein-alpha/DNAJC5 (PubMed:20798282). This chaperone activity is important to sustain normal SNARE-complex assembly during aging (PubMed:20798282). Also plays a role in the regulation of the dopamine neurotransmission by associating with the dopamine transporter (DAT1) and thereby modulating its activity (PubMed:26442590)
Specific Function
actin binding
Gene Name
SNCA
Uniprot ID
P37840
Uniprot Name
Alpha-synuclein
Molecular Weight
14460.155 Da
References
  1. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]
Kind
Protein
Organism
Mycobacterium tuberculosis (strain ATCC 25177 / H37Ra)
Pharmacological action
Unknown
Actions
Inhibitor
Curator comments
Dequalinium inhibits this enzyme, also known as mycothiol ligase (MshC).
General Function
Catalyzes the ATP-dependent condensation of GlcN-Ins and L-cysteine to form L-Cys-GlcN-Ins.
Specific Function
ATP binding
Gene Name
mshC
Uniprot ID
A5U4F6
Uniprot Name
L-cysteine:1D-myo-inositol 2-amino-2-deoxy-alpha-D-glucopyranoside ligase
Molecular Weight
45594.045 Da
References
  1. Gutierrez-Lugo MT, Baker H, Shiloach J, Boshoff H, Bewley CA: Dequalinium, a new inhibitor of Mycobacterium tuberculosis mycothiol ligase identified by high-throughput screening. J Biomol Screen. 2009 Jul;14(6):643-52. doi: 10.1177/1087057109335743. Epub 2009 Jun 12. [Article]
Kind
Protein group
Organism
Humans
Pharmacological action
Unknown
Actions
Antagonist
General Function
Calmodulin acts as part of a calcium signal transduction pathway by mediating the control of a large number of enzymes, ion channels, aquaporins and other proteins through calcium-binding (PubMed:16760425, PubMed:23893133, PubMed:26969752, PubMed:27165696, PubMed:28890335, PubMed:31454269, PubMed:35568036). Calcium-binding is required for the activation of calmodulin (PubMed:16760425, PubMed:23893133, PubMed:26969752, PubMed:27165696, PubMed:28890335, PubMed:31454269, PubMed:35568036). Among the enzymes to be stimulated by the calmodulin-calcium complex are a number of protein kinases, such as myosin light-chain kinases and calmodulin-dependent protein kinase type II (CaMK2), and phosphatases (PubMed:16760425, PubMed:23893133, PubMed:26969752, PubMed:27165696, PubMed:28890335, PubMed:31454269, PubMed:35568036). Together with CCP110 and centrin, is involved in a genetic pathway that regulates the centrosome cycle and progression through cytokinesis (PubMed:16760425). Is a regulator of voltage-dependent L-type calcium channels (PubMed:31454269). Mediates calcium-dependent inactivation of CACNA1C (PubMed:26969752). Positively regulates calcium-activated potassium channel activity of KCNN2 (PubMed:27165696). Forms a potassium channel complex with KCNQ1 and regulates electrophysiological activity of the channel via calcium-binding (PubMed:25441029). Acts as a sensor to modulate the endoplasmic reticulum contacts with other organelles mediated by VMP1:ATP2A2 (PubMed:28890335)
Specific Function
adenylate cyclase activator activity

Components:
References
  1. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]

Transporters

Kind
Protein
Organism
Escherichia coli (strain K12)
Pharmacological action
Unknown
Actions
Substrate
General Function
AcrA-AcrB-AcrZ-TolC is a drug efflux protein complex with broad substrate specificity that uses the proton motive force to export substrates.
Specific Function
efflux transmembrane transporter activity
Gene Name
acrB
Uniprot ID
P31224
Uniprot Name
Multidrug efflux pump subunit AcrB
Molecular Weight
113572.75 Da
References
  1. Bailly C: Medicinal applications and molecular targets of dequalinium chloride. Biochem Pharmacol. 2021 Apr;186:114467. doi: 10.1016/j.bcp.2021.114467. Epub 2021 Feb 10. [Article]
  2. Yu EW, Aires JR, McDermott G, Nikaido H: A periplasmic drug-binding site of the AcrB multidrug efflux pump: a crystallographic and site-directed mutagenesis study. J Bacteriol. 2005 Oct;187(19):6804-15. doi: 10.1128/JB.187.19.6804-6815.2005. [Article]

Drug created at June 13, 2005 13:24 / Updated at October 17, 2024 17:19