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。