Biomimetic recognition and peptidase activities of transition state analogue imprinted chymotrypsin mimics

被引:17
|
作者
Mathew, Divya [1 ]
Thomas, Benny [1 ,2 ]
Devaky, K. S. [1 ]
机构
[1] Mahatma Gandhi Univ, Sch Chem Sci, Priyadarshini Hills PO, Kottayam 686560, Kerala, India
[2] St Berchmans Coll, Dept Chem, Changanassery 686101, India
来源
关键词
Transition state analogue-built polymer; catalysts; Peptidolysis; Artificial amidase; Peptidase activity and 3D-memorized cavity; AMINO-ACID ESTERS; POLYMER CATALYSTS; P-NITROANILIDES; AMIDASE ACTIVITY; HYDROLYSIS; AMIDOLYSIS; PERFORMANCE; ADSORPTION; MONOMERS; DESIGN;
D O I
10.1016/j.reactfunctpolym.2018.01.005
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The first peptidolysis reaction utilizing transition state analogue imprinted polymer was demonstrated utterly in the viewpoint of size and shape-selective substrate recognition. The enzyme mimic polymer was synthesized from the amino acid triad histidine, aspartic acid and serine in presence of phenyl-1-(N-benzyloxycarbonylamino)-2-(phenyl)ethyl phosphonate transition state analogue (TSA) by molecular imprinting technique. The polymer catalyst synthesized exhibited high selectivity and performed as a reliable tool for peptidolytic reactions. The peptidase activity of the enzyme mimic polymer catalyst was investigated by following the hydrolysis of dipeptides spectrophotometrically at 207 nm and the kinetic parameters, rate acceleration k(acc)and imprinting efficiencyk(tm), were evaluated. The imprinted peptidase displayed a rate acceleration of 1.67 x 10(3) contrasted with the uncatalyzed peptidolysis and an imprinting efficiency of 45 over the non-imprinted control polymer. The artificial peptidase amazingly promoted the hydrolysis of dipeptides having Phe/Tyr amino acid as the C-terminal residues discriminating chymotrypsin specific and non-specific substrates. The mimic exhibited higher rate acceleration and substrate specificity towards peptides compared to amino acid p-nitroanilides. Despite the fact that natural enzyme is much superior to the MIP catalyst in hydrolase activities, the mimic portrays high thermal stability, prolonged life span and unrivaled recyclability and reusability.
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页码:121 / 128
页数:8
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