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Role of enzyme-peptide substrate backbone hydrogen bonding in determining protein kinase substrate specificities.

Abstract：

:As part of a search for peptides that have specificity for selected protein kinases, the possibility that adenosine cyclic 3',5'-phosphate dependent protein kinase (A-kinase) recognizes the hydrogen-bonding potential of its peptide substrates was investigated. A-Kinase catalyzes the phosphorylation of five N alpha-methylated and four depsipeptide derivatives of Leu-Arg-Arg-Ala-Ser-Leu-Gly (peptide 1) at rates that differ by at least 7 orders of magnitude. These peptide 1 analogues each lack the ability to donate a hydrogen bond at selected positions in the peptide chain. If a particular amide hydrogen of a peptide amide is involved in hydrogen bonding, which is important for enzyme recognition, the prediction is that peptides which contain an ester or a N-methylated bond at that position in peptide 1 will be comparatively poor substrates. In contrast, if a depsipeptide has a reactivity comparable to that of peptide 1 but the analogous N-methylated peptide has a poor reactivity with A-kinase, the result might indicate that the N-methyl group causes unfavorable steric effects. The depsipeptide that lacks a Leu6 amide proton is a good substrate for A-kinase, but the corresponding N-methylated peptide is phosphorylated far less efficiently. This result and others presented in this paper suggest that although enzyme-substrate hydrogen bonding may play some role in A-kinase catalysis of phosphoryl group transfer, other explanations are necessary to account for the relative reactivities of N alpha-methylated and depsi-containing peptide 1 analogues.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Thomas NE,Bramson HN,Miller WT,Kaiser ET

doi

10.1021/bi00388a041

subject

Has Abstract

pub_date

1987-07-14 00:00:00

pages

4461-6

issue

14

eissn

0006-2960

issn

1520-4995

journal_volume

26

pub_type

杂志文章

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