JP4748480B2 - 水または含水物の凍結を促進するための材料 - Google Patents
水または含水物の凍結を促進するための材料 Download PDFInfo
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- JP4748480B2 JP4748480B2 JP2006225536A JP2006225536A JP4748480B2 JP 4748480 B2 JP4748480 B2 JP 4748480B2 JP 2006225536 A JP2006225536 A JP 2006225536A JP 2006225536 A JP2006225536 A JP 2006225536A JP 4748480 B2 JP4748480 B2 JP 4748480B2
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- Prior art keywords
- water
- antifreeze protein
- carrier
- immobilized
- antifreeze
- Prior art date
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Description
(1)水または含水物の凍結を促進するためのポリペプチド固定化担体であって、分子表面に水分子結合側鎖を有するポリペプチドが担体上に集積して固定化されている、前記ポリペプチド固定化担体。
(2)ポリペプチドが、その水分子結合側鎖が露出するように配向されて担体上に固定化されている、(1)記載のポリペプチド固定化担体。
(3)ポリペプチドが、1×10-13〜1×10-9mol/cm2の量で固定化されている、(1)または(2)記載のポリペプチド固定化担体。
(4)不凍タンパク質が担体上に集積して固定化されている、不凍タンパク質固定化担体。
(5)不凍タンパク質が、その氷結晶結合部位が露出するように配向されて担体上に固定化されている、(4)記載の不凍タンパク質固定化担体。
(7)不凍タンパク質がIII型不凍タンパク質である、(4)〜(6)のいずれかに記載
の不凍タンパク質固定化担体。
(8)不凍タンパク質がシステインを導入した不凍タンパク質であり、該システイン導入不凍タンパク質が該システインのチオール基を介して担体に固定化されている、(4)〜(7)のいずれかに記載の不凍タンパク質固定化担体。
(9)不凍タンパク質が、1×10-13〜1×10-9mol/cm2の量で固定化されている、(4)〜(8)のいずれかに記載の不凍タンパク質固定化担体。
(10)(1)〜(3)のいずれかに記載のポリペプチド固定化担体または(4)〜(9)のいずれかに記載の不凍タンパク質固定化担体と水または含水物とを接触させることにより、該水または含水物の凍結を促進する方法。
(12)(1)〜(3)のいずれかに記載のポリペプチド固定化担体または(4)〜(9)のいずれかに記載の不凍タンパク質固定化担体と含水物とを接触させることにより、該含水物の水以外の成分を濃縮しながら水成分を凍結する方法。
魚類由来III型不凍タンパク質(AFP)を特開2004-083546公報に記載の方法により、ナガガジ属魚類(ナガガジ:Zoarces elongatus Kner)の魚体すり身から調製した。用いた魚類由来III型不凍タンパク質のアミノ酸配列(配列番号2)および該不凍タンパク質をコードするDNAの塩基配列(配列番号1)を配列表に示す。
(a)発現ベクターの構築
魚類由来III型不凍タンパク質(AFP)のアミノ末端6アミノ酸をコードし、さらに開始コドン(ATG)の直後にCysのコドン(TGC)を挿入したDNAプライマーと不凍タンパク質のカルボキシ末端及び終止コドンをコードするDNAプライマーを化学合成した。次に、合成したこれらのプライマーを用いて不凍タンパク質をコードするDNAを鋳型としてPCRを行った。増幅されたDNA断片をNde IとXho Iで制限酵素消化し、同酵素で消化したpET20bベクターに組込んだ(pETCys-AFP)。魚類由来のIII型不凍タンパク質のアミノ末端へシステインを導入するためのDNAの塩基配列(配列番号3)とそれによって発現されるアミノ酸
配列(配列番号4)を配列表に示す。
プラスミドpETCys-AFPで大腸菌BL21(DE3)を形質転換した。プラスミドpETCys-AFPにはアンピシリン耐性遺伝子が導入されているため、アンピシリン100μg/ml含有LB寒天培地に大腸菌を広げ、一晩28℃でインキュベートすることで形質転換体を選択した。形成されたコロニーの一つを100μg/mlのアンピシリンを含んだLB培地2 mlに植え28℃で一晩培養した。この培養液を100μg/mlのアンピシリンを含んだLB培地100 mlに植え継ぎし、さらに28℃で一晩培養した。100 mlの培養液のうち20 mlを100μg/mlのアンピシリンを含んだLB培地2000 mlに植え継ぎし、波長600 nmの吸光度で大腸菌の増殖度をモニターしながら28℃で培養した。波長600 nmの吸光度が0.5になったところでイソプロピル-β-D(−)-チオガラクトピラノシドを終濃度0.5 mM になるように加えることによりCys-AFPの発現を誘導し、さらに8時間培養を行った。
培養液を3600 × g、4℃で15分遠心分離し、菌体を回収した。菌体を10 mM トリス-塩酸緩衝液 / 1mM エチレンジアミン四酢酸ニナトリウム (pH 8.0) (TE緩衝液)に縣濁し、氷中で超音波破砕した。これを11900 × g、4℃で30分遠心分離し、可溶性画分と不溶性画分に分離した。可溶性画分を50mMクエン酸ナトリウム緩衝液(pH 2.9)に対して透析し、溶液の置換を行った。透析によって生じた沈殿は11900 × g、4℃で30分遠心分離することで除去し、上澄み液を回収した。上澄み液からのCys-AFPの精製には50mMクエン酸ナトリウム緩衝液(pH 2.9)で平衡化したHigh−Sカラム(BIO-RAD)を接続したDUO Flowシステム(BIO-RAD)を用いた。まず、上澄み液をカラムに通した後、カラム体積の3倍量の緩衝液A、50mMクエン酸ナトリウム緩衝液(pH 2.9)でカラムを洗浄した。次に一定の割合で緩衝液B、50mMクエン酸ナトリウム緩衝液1M塩化ナトリウム(pH 2.9)の混合比率を増加させながら緩衝液Aをカラムに通しCys-AFPの溶出を行った。Cys-AFPの溶出は波長280nmおよび214 nmの吸光度で検出し、溶出Cys-AFPをフラクションコレクターで回収した。精製操作は常に4℃のチャンバー内で行い、流速は1ml/min、1フラクションあたりの回収量は1 mlとした。
一般的な手順に従い、電気泳動装置 (ATTO) 用いて精製したCys-AFPを15% ポリアクリ
ルアミドゲルで泳動した。分子量測定のため、broad range SDS-PAGE standard (BIO-RAD) を同時に泳動した。サンプル緩衝液は、0.065 M トリス-塩酸緩衝液 (pH6.8) / 2 % ドデシル硫酸ナトリウム / 10 % ショ糖 / 5 % β-メルカプトエタノール / 0.001 % ブロモフェノールブルーを用いた。濃縮ゲルは0.5 M トリス-塩酸緩衝液 (pH 6.8) 0.75 ml、30 % アクリルアミド / ビス (37.5 : 1) 混合液 0.45 ml、10 % ドデシル硫酸ナトリウム 0.12 ml、蒸留水1.78 mlを混合して作製し、分離ゲルは1.5 M トリス-塩酸緩衝液 (pH8.8) 2.25 ml、30% アクリルアミド / ビス (37.5 : 1) 混合液 4.5 ml、10 % ドデシル硫酸ナトリウム 0.36 ml、蒸留水1.89 mlを混合して作製した。泳動用緩衝液は、トリス(ヒドロキシメチル)アミノメタン 3.03g、グリシン 14.4g及びドデシル硫酸ナトリウム 1gを合計1 lの蒸留水中に溶解させたものを用いた。ゲルの染色はメタノール 20 ml、硫酸アンモニウム 12.5g、 リン酸 2.5ml、0.04 % クマシーブリリアントブルー G-250を100mlの蒸留水の溶液に溶かした染色液を用いて一晩行い、蒸留水で脱染色した。分子量 7 KDa のCys-AFPとその二量体のそれぞれ単一のバンドが観測され純度高く精製されているのが確認できた。
(1)で調製した天然AFPおよび(2)で調製したCys-AFPを50mM リン酸緩衝液 / 0.05M NaCl水溶液(pH6.0)に対して透析し、緩衝液置換を行った後に1mg/mlになるまで限外濾過により濃縮を行った。なお、注目する検体液が不凍活性を有するか否かの評価は、低温顕微鏡下でのバイピラミッド型氷結晶観察実験をすることで1μlの液に対してでも実施できる。
(a)天然AFPの固定化
シリコンウェーハ(111)上に金を500Åの厚さで蒸着した金薄膜基板を、0.1 mMのメルカプトプロピオン酸のエタノール溶液に一晩浸漬し、メルカプトプロピオン酸のチオール基と金との結合を利用してプロピオン酸基を露出させた界面を作製した。この界面上のプロピオン酸のカルボキシル基を2mMのカルボジイミドおよび5mMのスクシンイミド混合溶液(100 mMリン酸緩衝液(pH7.0))に25℃で1時間浸漬することで活性化した後、天然AFP溶液(10 mMリン酸緩衝液(pH 8.0))に4℃で一晩浸漬し、天然AFPのアミノ基、すなわち最も溶媒中に露出され反応性が高いと考えられるN末端のアミノ基、と活性化カルボキシル基のペプチド縮合を利用して不凍タンパク質を金薄膜に固定化した。
シリコンウェーハ(111)上に金を500Åの厚さで蒸着した金薄膜基板を、0.1 mMのCys-AFPの溶液(50mM リン酸緩衝液 / 0.05M NaCl水溶液(pH6.0))に25℃で一晩浸漬し、システイン残基のチオール基と金との結合を利用して不凍タンパク質を金薄膜上に固定した。
本方法により作製された不凍タンパク質固定化担体の分析を、X線電子分光法、反射赤外分光法、表面増強赤外分光法、電気化学分析法、水晶振動子マイクロバランス(QCM)法により行った。
不凍タンパク質を固定化した基板の凍結促進活性を評価するために以下の実験を行った。
Claims (8)
- 不凍タンパク質が担体上に集積して固定化されている、不凍タンパク質固定化担体であって、該不凍タンパク質が、その氷結晶結合部位が露出するように配向されて担体上に固定化されている、上記不凍タンパク質固定化担体。
- 不凍タンパク質が、その氷結晶結合部位が平面構造を形成しているものである、請求項1記載の不凍タンパク質固定化担体。
- 不凍タンパク質がIII型不凍タンパク質である、請求項1または2記載の不凍タンパク質固定化担体。
- 不凍タンパク質がシステインを導入した不凍タンパク質であり、該システイン導入不凍タンパク質が該システインのチオール基を介して担体に固定化されている、請求項1〜3のいずれか1項記載の不凍タンパク質固定化担体。
- 不凍タンパク質が、1×10-13〜1×10-9mol/cm2の量で固定化されている、請求項1〜4のいずれか1項記載の不凍タンパク質固定化担体。
- 請求項1〜5のいずれか1項記載の不凍タンパク質固定化担体と水または含水物とを接触させることにより、該水または含水物の凍結を促進する方法。
- 請求項1〜5のいずれか1項記載の不凍タンパク質固定化担体と水または含水物とを接触させることにより、該水または含水物に含まれる気体を除去しながら該水または含水物を凍結する方法。
- 請求項1〜5のいずれか1項記載の不凍タンパク質固定化担体と含水物とを接触させることにより、該含水物の水以外の成分を濃縮しながら水成分を凍結する方法。
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JP2010248160A (ja) * | 2009-04-20 | 2010-11-04 | National Institute Of Advanced Industrial Science & Technology | 細胞延命効果を有するペプチド |
JP5536874B2 (ja) * | 2010-03-16 | 2014-07-02 | 独立行政法人産業技術総合研究所 | 不凍タンパク質を用いる多孔体の製造方法 |
US20130153818A1 (en) * | 2010-08-26 | 2013-06-20 | Nichirei Foods Inc. | Method for increasing thermal hysteresis activity, method for reducing thermal inactivation of thermal hysteresis activity, and composition for increasing thermal hysteresis activity |
JP2012176940A (ja) * | 2011-02-01 | 2012-09-13 | National Institute Of Advanced Industrial Science & Technology | 細胞延命効果を有するペプチドを用いた牛胚の非凍結低温保存液及び保存方法 |
JP5935132B2 (ja) * | 2012-03-24 | 2016-06-15 | 国立研究開発法人国際農林水産業研究センター | 蛋白質の整列方法 |
US9394327B1 (en) * | 2013-03-15 | 2016-07-19 | The Trustees Of California State University | Nucleoside crystals, crystal nucleation and growth control with antifreeze proteins |
CN108027203B (zh) * | 2015-07-22 | 2020-11-03 | 北卡罗来纳-查佩尔山大学 | 具有利用冰成核剂的冻结-解冻阀的流体装置和相关的操作和分析方法 |
WO2021063943A1 (en) * | 2019-09-30 | 2021-04-08 | Logon Patentverwertungs-Verwaltungs Gmbh | Bacterial preparations for ice nucleation |
US20220411537A1 (en) * | 2020-05-06 | 2022-12-29 | Universidad De Los Andes | Bio-nanocompound as an agent for nucleating aqueous-based compounds and production method thereof |
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US4784943A (en) * | 1987-05-22 | 1988-11-15 | Advanced Genetic Sciences, Inc. | Ice nucleation immunoassay |
DE10060746A1 (de) | 1999-12-21 | 2001-06-28 | Merck Patent Gmbh | Maleinimid-Linker mit geschützter Thiol- oder Disulfid-Funktionalität |
JP4228068B2 (ja) | 2001-11-21 | 2009-02-25 | 独立行政法人産業技術総合研究所 | 魚類由来の不凍タンパク質 |
ATE410450T1 (de) * | 2003-01-22 | 2008-10-15 | Bionanophotonics As | Licht-induzierte immobilisierung |
JP2004344033A (ja) * | 2003-05-21 | 2004-12-09 | National Institute Of Advanced Industrial & Technology | 魚類が有する不凍タンパク質 |
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ATE445635T1 (de) | 2009-10-15 |
EP1829890A1 (en) | 2007-09-05 |
DE602006009755D1 (de) | 2009-11-26 |
US7700718B2 (en) | 2010-04-20 |
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US20070134647A1 (en) | 2007-06-14 |
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