期刊
BIOCHIMIE
卷 108, 期 -, 页码 68-75出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.biochi.2014.11.001
关键词
Small heat shock proteins; Phosphorylation; Quaternary structure; Heterooligomeric complexes; Crowding agents; Self-association
资金
- Russian Science Foundation (RSF) [14-35-00026]
- program Molecular and Cell Biology of the Presidium of Russian Academy of Sciences and Russian Foundation for Basic Research [14-04-01530, 14-0400146]
- Russian Science Foundation [14-35-00026] Funding Source: Russian Science Foundation
Effect of trimethylamine N-oxide (TMAO), well-known osmolyte, widely used to imitate crowded intracellular conditions, on the quaternary structure of recombinant human small heat shock protein HspB6 (Hsp20) was analyzed by means of size-exclusion chromatography, chemical crosslinking and analytical ultracentrifugation. Consistent with previous reports, in the absence of TMAO unphosphorylated, pseudophosphorylated (S16D mutant) and phosphorylated HspB6 form only small oligomers (presumably dimers). Addition of TMAO to unphosphorylated HspB6 leads to formation of different large oligomers being in equilibrium with dimers. Pseudophosphorylation (S16D mutation) or phosphorylation partially or completely prevent TMAO-induced oligomerization of HspB6. Pseudophosphorylation affects bis-ANS binding suggesting decreased hydrophobicity of HspB6. According to size-exclusion chromatography, TMAO-induced changes of HspB6 oligomerization result in its altered interaction with HspB1 and this effect can be reversed by HspB6 phosphorylation. It is concluded that under conditions of molecular crowding, characteristic for intracellular environment, HspB6 undergoes reversible changes of its oligomeric state which can affect its physiologically important properties and can be delicately regulated by phosphorylation. (C) 2014 Elsevier B.V. and Societe francaise de biochimie et biologie Moleculaire (SFBBM). All rights reserved.
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