JP5358604B2 - ルックスルー突然変異誘発 - Google Patents
ルックスルー突然変異誘発 Download PDFInfo
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- JP5358604B2 JP5358604B2 JP2011062697A JP2011062697A JP5358604B2 JP 5358604 B2 JP5358604 B2 JP 5358604B2 JP 2011062697 A JP2011062697 A JP 2011062697A JP 2011062697 A JP2011062697 A JP 2011062697A JP 5358604 B2 JP5358604 B2 JP 5358604B2
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Description
その部分)をコードするポリヌクレオチドを指す。したがって変異体ポリヌクレオチドは、異なるアミノ酸の発現を生じるよう変更された1つまたは複数のコドンを含有する。
は一緒に混合され、結繋されて、全長二本鎖分子を生成する(例えば図8参照)。便利な制限部位は、適切なベクター中へのクローニングのために合成遺伝子の末端近くに設計され得る。全長分子は、それらの制限酵素で切断されて、適切なベクターに結繋され得る。便利な制限部位は、突然変異原性カセットの導入を促すために、合成遺伝子の配列中にも組入れられ得る。
A. and Skerra, A., Meth. Enzymol. 178: 476-515 (1989); Skerra, A. et al.,
Biotechnology 9: 273-278 (1991))により記載されたものにおいて発現され得る。突然変異体タンパク質は、M. Better and A. Horwitz, Meth. Enzymol. 178: 476 (1989)により記載されているように、媒質中でおよび/または細菌の細胞質中での分泌のために発現され得る。一実施形態では、VHおよびVLをコードする単一ドメインは各々、シグナル配列、例えばompA、phoAまたはpelBシグナル配列をコードする一配列の3’末端に結合される(Lei, S.P. et al., J. Bacteriol.
169: 4379 (1987))。これらの遺伝子融合物は、それらが単一ベクターから発現され、そして大腸菌のペリプラズム空間中に分泌され、ここでそれらは再フォールディングされて、活性形態で回収され得る(Skerra, A. et al., Biotechnology 9: 273-278 (1991))。例えば抗体重鎖遺伝子は、抗体軽鎖遺伝子と同時発生的に発現されて、抗体または抗体断片を産生し得る。
バイオパルピング製法における工業的応用、バイオマスの燃料またはその他の化学物質への転化、廃水夾雑物の転化、石炭のバイオプロセシング、ならびに有害有機化合物の解毒は、新規のタンパク質の考え得る用途である。
Harbor Laboratory Press(1989);DNA
Cloning, Vols. 1 and 2, (D.N. Glover, Ed. 1985); Oligonucleotide Synthesis(M.J.
Gait, Ed. 1984); PCR Handbook Current Protocols in Nucleic Acid Chemistry,
Beaucage, Ed. John Wiley & Sons (1999)(Editor); Oxford Handbook of Nucleic
Acid Structure, Neidle, Ed., Oxford Univ Press (1999); PCR Protocols: A Guide
to Methods and Applications, Innis et al., Academic Press (1990); PCR Essential
Techniques: Essential Techniques, Burke, Ed., John Wiley & Son Ltd (1996);
The PCR Technique: RT-PCR Siebert, Ed., Eaton Pub. Co. (1998); Antibody
Engineering Protocols (Methods in Molecular Biology), 510, Paul, S., Humana Pr
(1996); Antibody Engineering: A Practical Approach (Practical Approach Series,
169), McCafferty, Ed., Irl Pr (1999); Antibodies: A Laboratory Manual, Harlow
et al., C.S.H.L. Press, Pub. (1999); Current Protocols in Molecular Biology,
eds. Ausubel et al., John Wiley & Sons (1992); Large-Scale Mammalian Cell
Culture Technology, Lubiniecki, A., Ed., Marcel Dekker, Pub., (1990). Phage
Display: A Laboratory Manual, C. Barbas (Ed.), CSHL Press, (2001); Antibody
Phage Display, P O’Brien (Ed.), Humana Press (2001); Border et al., Yeast
surface display for screening combinatorial polypeptide libraries, Nature
Biotechnology, 15(6): 553-7 (1997); Border et al., Yeast surface display for
directed evolution of protein expression, affinity, and stability, Methods
Enzymol., 328: 430-44 (2000);米国特許第6,348,315号(Pluckthun等)に記載されたようなリボソーム ディスプレー、ならびに米国特許第6,258,558号;第6,261,804号および第6,214,553号(Szostak等)に記載されたようなプロヒュージョンTMを参照されたい。
Pluckthun, A. et al., Cold Spring Harbor Symp. Quant. Biol., Vol. LII: 105-112
(1987)参照)。MCPC603抗体に関するCDRは、図2に示したように同定されている。重鎖において、CDR1はアミノ酸残基位置31〜35に亘り、CDR2は位置50〜69に亘り、そしてCDR3は位置101〜111に及ぶ。軽鎖では、CDR1のアミノ酸残基は24〜40であり、CDR2はアミノ酸55〜62に亘り、そしてCDR3はアミノ酸95〜103に及ぶ。
V.A. et al., Proc. Natl. Acad. Sci. USA 87: 6654-6658 (1990))。この情報は、MCPC603のx線構造からのデータと一緒に用いて、突然変異誘発のために標的化されるCDRの中の密接接触の見込みのある領域を選択する。構造/モデリング情報により誘導されるこの種類のルック・スルー突然変異誘発は、「ガイド・スルー」突然変異誘発と呼ばれ得る。
et al. (2001) Infect. Immun. 69: 570に記載された抗BoNT/A抗体は、少なくとも1等級だけそれらの親和性を改善する目的で用い得る。BoNT/A重鎖結合ドメイン(BoNT/A Hc)抗原は、Metabiologics, Inc., WIから入手し得る。
10701-10705)。ディスプレー系は、a−アグルチニン酵母接着受容体を利用して、細胞表面にタンパク質を表示する。当該タンパク質は、本発明の場合、抗BoTN/BscFv LTMライブラリーまたは抗BoTN/AscFv LTMライブラリーを、Aga2タンパク質との融合相手として発現する。これらの融合タンパク質は、細胞から分泌され、そしてAga1タンパク質とジスルフィド結合されるようになり、これが酵母細胞壁に付着される(Invitrogen、pYD1酵母ディスプレー産物文献参照)。さらに包含されるカルボキシル末端タグが存在し、これを用いて、発現レベルをモニタリングし、および/または結合親和性測定値を正規化し得る。
(1997) Exp. Neurol. 147: 96-102)MPAにおいて、左横隔膜神経を、左片側横隔膜と一緒に、マウスから切除する。次に横隔膜神経を、組織浴中で、連続的に電気刺激する。精製抗体を、BoNT/BまたはBoNT/Aとともにインキュベートし、組織浴に付加する。毒素誘導性麻痺を、初期筋肉痙攣の50%低減と定義する。
Claims (38)
- ポリペプチド類似体のライブラリーであって、以下の:
ポリペプチドのアミノ酸配列の限定領域を選択し;
限定領域内の各アミノ酸位置で置換されるべきアミノ酸残基を確定し;
限定領域をコードする個々のポリヌクレオチドを合成し、ポリヌクレオチドは集合的に以下の判定基準に従って考え得る変異体ポリヌクレオチドを表し:
i)各ポリヌクレオチドが、限定領域中の各コドン位置に、ポリペプチドのアミノ酸残基に必要なコドンまたは予定アミノ酸残基に関するコドンを含有し、
ii)各ポリヌクレオチドが予定アミノ酸残基に関する1つ以下のコドンを含有する;
それにより、予定アミノ酸残基が限定領域内の各アミノ酸位置に出現するポリヌクレオチドのライブラリーを生成する
ことを包含する方法により調製されるライブラリー。 - 所望の構造または性能を有するポリペプチドの同定方法であって、以下の:
ポリペプチドのアミノ酸配列の限定領域を選択し;
限定領域内の各アミノ酸位置で置換されるべきアミノ酸残基を確定し;
限定領域をコードする個々のポリヌクレオチドを合成し、ポリヌクレオチドは集合的
に以下の判定基準に従って考え得る変異体ポリヌクレオチドを表し:
i)各ポリヌクレオチドが、限定領域中の各コドン位置に、ポリペプチドのアミノ酸残基に必要なコドンまたは予定アミノ酸残基に関するコドンを含有し、
ii)各ポリヌクレオチドが予定アミノ酸残基に関する1つ以下のコドンを含有する;
それにより、ポリヌクレオチドを含有する発現ライブラリーを生成し;
ポリペプチド類似体を生成するために発現ライブラリーを発現し; そして
所望の構造または機能を有するポリペプチドに関して選択されるポリペプチド類似体をスクリーニングする
ことを包含する方法。 - 選定ポリペプチド類似体をコードするポリヌクレオチドを同定する過程をさらに包含する、請求項2記載の方法。
- スクリーニングがポリペプチドを標的基質と接触することを包含し、ポリペプチドがポリペプチドをコードするポリヌクレオチドと関連づけられ、ポリヌクレオチドが検出可能部分をさらに含み、したがって標的基質を結合し得る変異体ポリペプチドが検出され、それによりポリヌクレオチドによりコードされると同定される、請求項2記載の方法。
- 検出可能部分が蛍光部分、UV部分および可視光吸収部分からなる群から選択される、請求項4記載の方法。
- 検出可能部分がビオチン部分、GST部分およびHisタグ部分からなる群か選択される、請求項4記載の方法。
- ポリヌクレオチドがリボソームディスプレーを用いてポリペプチド類似体と関連づけられる、請求項4記載の方法。
- ポリペプチド内の2つまたはそれ以上の限定領域が突然変異化される、請求項2記載の方法。
- 同一予定アミノ酸が2またはそれ以上の各限定領域内での置換のために選択される、請求項8記載の方法。
- 異なる予定アミノ酸がそれぞれ2またはそれ以上の各限定領域内での置換のために選択される、請求項8記載の方法。
- ポリペプチドが一本鎖抗体(sFV)である、請求項2記載の方法。
- 限定領域がポリペプチドの機能性ドメインを含む、請求項2記載の方法。
- 限定領域がCDR1、CDR2、CDR3、およびその組合せからなる群から選択されるCDRまたはその部分を含む、請求項2記載の方法。
- 限定領域がFR1、FR2、FR3、FR4およびその組合せからなる群から選択されるドメインを含む抗体フレームワーク領域である、請求項2記載の方法。
- 限定領域が補体結合部位およびFc結合領域からなる群から選択されるドメインを含む抗体エフェクター領域である、請求項2記載の方法。
- 予定アミノ酸残基がSer、Thr、Asn、Gln、Tyr、Cys、His、Glu、Asp、Lys、Arg、Ala、Gly、Ile、Leu、Met、Phe、Pro、TrpおよびValからなる群から選択される、請求項2記載の方法。
- 1つまたは複数の限定領域を含むポリペプチド類似体をコードするポリヌクレオチドのライブラリーであって、予定アミノ酸残基が限定領域内の各アミノ酸位置で置換され、ポリヌクレオチドが集合的に以下の判定基準:
i)各ポリヌクレオチドが、限定領域中の各コドン位置に、ポリペプチドのアミノ酸残基に必要なコドンまたは予定アミノ酸残基に関するコドンを含有し、そして
ii)各ポリヌクレオチドが予定アミノ酸残基に関する1つ以下のコドンを含有する
に従って考え得る全ての変異体を表すライブラリー。 - ポリペプチド内の2つまたはそれ以上の限定領域が突然変異化される、請求項17記載のライブラリー。
- 同一予定アミノ酸が2またはそれ以上の各限定領域内での置換のために選択される、請求項17記載のライブラリー。
- 異なる予定アミノ酸がそれぞれ2またはそれ以上の各限定領域内での置換のために選択される、請求項17記載のライブラリー。
- 発現ライブラリーである、請求項17記載のライブラリー。
- 発現ライブラリーがファージディスプレーライブラリー、リボソーム/ ポリソームディスプレーライブラリー、酵母ディスプレーライブラリー、細菌ディスプレーライブラリーおよびアレイ化ライブラリーからなる群から選択される、請求項17記載のライブラリー。
- ポリヌクレオチドが1つまたは複数の転写調節素子をさらに含む、請求項17記載のライブラリー。
- ポリヌクレオチドが、in vitroで転写および翻訳される場合、対応するポリヌクレオチドによりコードされるポリペプチドと関連づけられる、請求項23記載のライブラリー。
- ポリヌクレオチドがリボソーム/ポリソームディスプレーを用いてポリペプチドと関係づけられる、請求項24記載のライブラリー。
- ポリヌクレオチドがRNAを含む、請求項25記載のライブラリー。
- ポリヌクレオチドが検出可能部分をさらに含む、請求項26記載のライブラリー。
- 検出可能部分が蛍光部分を含む、請求項27記載のライブラリー。
- 少なくとも106の異なるポリヌクレオチドを含む、請求項17記載のライブラリー。
- 少なくとも45〜1012の異なるポリヌクレオチドを含む、請求項17記載のライブラリー。
- ポリペプチドが結合ポリペプチドをコードする、請求項17記載のライブラリー。
- 結合ポリペプチドが重鎖可変部(VH)、軽鎖可変部(VL)および一本鎖抗体(sFv)からなる群から選択される、請求項31記載のライブラリー。
- ポリヌクレオチドが酵素をコードする、請求項17記載のライブラリー。
- ポリヌクレオチドが酵素阻害剤をコードする、請求項17記載のライブラリー。
- ポリヌクレオチドが触媒ポリペプチドをコードする、請求項17記載のライブラリー。
- 固体支持体上に固定される、請求項17記載のライブラリー。
- 固体支持体がマイクロチップである、請求項17記載のライブラリー。
- アレイ化ライブラリーである、請求項17記載のライブラリー。
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JP2007524390A (ja) | 2007-08-30 |
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AU2004254352A1 (en) | 2005-01-13 |
IL172736A0 (en) | 2006-04-10 |
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CN1836041A (zh) | 2006-09-20 |
BRPI0412007A (pt) | 2006-08-15 |
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RU2005140664A (ru) | 2007-08-27 |
NO20060108L (no) | 2006-03-24 |
CA2542192C (en) | 2013-05-28 |
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