Abstract
Oligomeric association of human small heat shock proteins HspB1, HspB5, HspB6 and HspB8 was analyzed by means of size-exclusion chromatography, analytical ultracentrifugation and chemical cross-linking. Wild-type HspB1 and Cys mutants of HspB5, HspB6 and HspB8 containing a single Cys residue in position homologous to that of Cys137 of human HspB1 were able to generate heterodimers cross-linked by disulfide bond. Cross-linked heterodimers between HspB1/HspB5, HspB1/HspB6 and HspB5/HspB6 were easily produced upon mixing, whereas formation of any heterodimers with participation of HspB8 was significantly less efficient. The size of heterooligomers formed by HspB1/HspB6 and HspB5/HspB6 was different from the size of the corresponding homooligomers. Disulfide cross-linked homodimers of small heat shock proteins were unable to participate in heterooligomer formation. Thus, monomers can be involved in subunit exchange leading to heterooligomer formation and restriction of flexibility induced by disulfide cross-linking prevents subunit exchange.
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Abbreviations
- DTT:
-
Dithiothreitol
- ME:
-
Mercaptoethanol
- SEC:
-
Size-exclusion chromatography
- sHsp:
-
Small heat shock proteins
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This investigation was supported by Russian Foundation for Basic Science (grant 10-04-00026).
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Reduction of disulfide cross-linked wild-type HspB1 and Cys mutants of human small heat shock proteins. Isolated small heat shock proteins (lanes 1 and 3) or their pair-wise mixture (lane 2) were subjected to subunit exchange followed by mild oxidation as described in “Material and methods”. The samples thus obtained were subjected to reduction and SDS–gel electrophoresis. a HspB1 + HspB6; b HspB5 + HspB6; c HspB1 + HspB5; d HspB8 + HspB5; e HspB8 + HspB6; f HspB8 + HspB1. Trace amounts of non-reduced disulfide cross-linked dimers are detected as a very faint bands with apparent molecular masses of 42–66 kDa. The positions of molecular mass standards (in kilodaltons) are indicated by arrows (PDF 233 kb)
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Mymrikov, E.V., Seit-Nebi, A.S. & Gusev, N.B. Heterooligomeric complexes of human small heat shock proteins. Cell Stress and Chaperones 17, 157–169 (2012). https://doi.org/10.1007/s12192-011-0296-0
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DOI: https://doi.org/10.1007/s12192-011-0296-0