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Activation of calpain by Ca2+: roles of the large subunit N-terminal and domain III-IV linker peptides.

Abstract：

:The calpains are a family of cysteine proteases with closely related amino acid sequences, but a wide range of Ca(2+) requirements (K(d)). For m-calpain, K(d) is approximately 325microM, for mu-calpain it is approximately 50microM, and for calpain 3 it is not strictly known but may be approximately 0.1microM. On the basis of previous structure determination of m-calpain we postulated that two regions of the calpain large subunits, the N-terminal peptide (residues 1-20) and a domain III-IV linker peptide (residues 514-530 in m-calpain) were important in defining K(d). The mutations Lys10Thr in the N-terminal peptide, and Glu517Pro in the domain linker peptide, reduced K(d) of m-calpain by 30% and 42%, respectively, revealing that these two regions are functionally important. The increased Ca(2+)-sensitivity of these mutants demonstrate that the Lys10-Asp148 salt link and the short beta-sheet interaction involving Glu517 are factors contributing to the high K(d) of m-calpain. Though these two regions are physically remote from the active site and Ca(2+)-binding site, they play significant roles in regulating the response of calpain to Ca(2+). Differences in these interactions in mu-calpain and in calpain 3 are also consistent with their progressively lower K(d) values.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Hosfield CM,Elce JS,Jia Z

doi

10.1016/j.jmb.2004.08.073

keywords:

subject

Has Abstract

pub_date

2004-10-29 00:00:00

pages

1049-53

issue

4

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(04)01073-3

journal_volume

343

pub_type

杂志文章

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