The present invention relates to a method and tools which allow the kinetic monitoring of hydrolase enzyme activity. The present invention also aims to provide synthetic peptides and peptide residues modified such that they can be used in assays for monitoring hydrolase enzyme activity, and preferably phosphatase activity. Also claimed are modified tyrosine amino acid derivatives of formula (IV), wherein Y is chosen from —PO
y
2−
with y equal to 2 or 3 and esters thereof, —SO
z
−
with z equal to 2 or 3 and esters thereof, a carbohydrate or carbohydrate derivatives; and; wherein X
1
and/or X
2
is selected from —N
3
, —NO
2
, —CI, or —CN, —SCN, a C
1
to C
8
alkyl, or H, wherein either X
1
or X
2
is not H.
本发明涉及一种方法和工具,可允许动力学监测
水解酶酶活性。本发明还旨在提供合成的
多肽和
多肽残基的修饰,使它们可以用于监测
水解酶酶活性,优选
磷酸酶活性的测定中。还声明了公式(IV)中的修饰
酪氨酸氨基酸衍
生物,其中Y选择自-POy2-,其中y等于2或3及其
酯,-SOz-,其中z等于2或3及其
酯,一种
碳水化合物或
碳水化合物衍
生物; 而X1和/或X2选择自-N3,-
NO2,-CI或-CN,-SCN,C1至C8烷基或H,其中X1或X2中的任意一个不是H。