发明名称 |
GENETIC SYSTEM AND SELF-CLEAVING INTEINS DERIVED THEREFROM, BIOSEPARATIONS AND PROTEIN PURIFICATION EMPLOYING SAME, AND METHODS FOR DETERMINING CRITICAL, GENERALIZABLE AMINO ACID RESIDUES FOR VARYING INTEIN ACTIVITY |
摘要 |
A self-cleaving element for use in bioseparations has been derived from a naturally occurring, 43 kDa protein splicing element (intein) through a combination of protein engineering and random mutagenesis. A mini-intein (18 kDa) previously engineered for reduced size had compromised activity and was therefore subjected to random mutagenesis and genetic selection. In one selection a mini-intein was isolated with restored splicing activity, while in another, a mutant was isolated with enhanced, pH-sensitive C-terminal cleavage activity. The enhanced cleavage mutant has utility in affinity fusion-based protein purification. The enhanced splicing mutant has utility in purification of proteins such as toxic proteins, for example, by inactivation with the intein in a specific region and controllable splicing. These mutants also provide new insights into the structural and functional roles of some conserved residues in protein splicing. Thus, disclosed and claimed are: a genetic system and self-cleaving inteins therefrom; bioseparations employing same; protein purification by inactivation with inteins in specific regions and controllable intein splicing; methods for determining critical, generalizable residues for varying intein activity; and products.
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申请公布号 |
US6933362(B1) |
申请公布日期 |
2005.08.23 |
申请号 |
US20000641808 |
申请日期 |
2000.08.17 |
申请人 |
RENSSELAER POLYTECHNIC INSTITUTE;HEALTH RES INST |
发明人 |
BELFORT MARLENE;BELFORT GEORGES;DERBYSHIRE VICKY;WOOD DAVID;WU WEI |
分类号 |
C07K1/00;C07K14/00;C07K14/35;C12N9/10;C12N9/22;(IPC1-7):C07K1/00 |
主分类号 |
C07K1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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