Chemically modified mutant serine hydrolases show improved catalytic activity and chiral selectivity
申请人:Jones Bryan John
公开号:US20050282248A1
公开(公告)日:2005-12-22
This invention provides novel chemically modified mutant serine hydrolases that catalyze a transamidation and/or a transpeptidation and/or a transesterification reaction. The modified serine hydrolases have one or more amino acid residues in a subsite replaced with a cysteine, wherein the cysteine is modified by replacing the thiol hydrogen in the cysteine with a substituent group providing a thiol side chain comprising a moiety selected from the group consisting of a polar aromatic substituent, an alkyl amino group with a positive charge, and a glycoside. In particularly preferred embodiments, the substitutents include an oxazolidinone, a C
1
to C
15
alkyl amino group with a positive charge, or a glycoside.
该发明提供了一种新型的化学修饰突变丝氨酸水解酶,其催化转酰胺化和/或转肽化和/或酯交换反应。改性的丝氨酸水解酶具有一个或多个氨基酸残基在一个亚位点上被取代为半胱氨酸,其中半胱氨酸通过用提供来自一组成员的基团的硫醇侧链替换半胱氨酸中的硫氢原子而进行修饰,所述基团包括极性芳香基团、带有正电荷的烷基氨基团和糖苷。在特别优选的实施方式中,取代基包括噁唑啉酮、具有正电荷的C1到C15烷基氨基团或糖苷。