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• W1966222511 endingPage "445" @default.
• W1966222511 startingPage "436" @default.
• W1966222511 abstract "Murine small stress protein [heat shock protein 25 (Hsp25)] expression confers thermotolerance and protection against oxidative stress. Hsp25 is an oligomeric ATP-independent phospho-chaperone that can generate a glutathione-dependent pro-reducing state in cells that are normally devoid of small stress protein constitutive expression. Hsp25 contains only one cysteine residue (position 141) that is highly susceptible to oxidation. We have explored the significance of this reactive residue by generating a mutant in which cysteine-141 was substituted by an alanine residue (C141A mutant). We report here that the C141A mutant did not form dimers when expressed in either murine L929 or human HeLa cells, hence, demonstrating that cysteine-141 regulates Hsp25 dimer formation. The C141A mutant also interfered with the dimerization of human Hsp27, a constitutively expressed small stress protein in HeLa cells. The mutated polypeptide showed a decreased ability to multimerize, but its expression was still able to induce cellular protection against oxidative stress. The C141A mutant was, however, less efficient than the wild-type protein in counteracting staurosporine-induced apoptosis, and it showed no in vivo chaperone activity. Hence, the cellular protection mediated against different stressors may require specific structural organizations of Hsp25 that are differently altered by the mutation. Of interest, when expressed concomitantly with wild-type Hsp25, the C141A polypeptide induced a dominant-negative effect, a phenomenon that may result from the ability of small stress proteins to interact and multimerize with each other." @default.
• W1966222511 created "2016-06-24" @default.
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• W1966222511 creator A5063507401 @default.
• W1966222511 creator A5083901279 @default.
• W1966222511 date "2005-03-01" @default.
• W1966222511 modified "2023-10-10" @default.
• W1966222511 title "Substitution of the Unique Cysteine Residue of Murine Hsp25 Interferes with the Protective Activity of This Stress Protein Through Inhibition of Dimer Formation" @default.
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• W1966222511 doi "https://doi.org/10.1089/ars.2005.7.436" @default.
• W1966222511 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15706091" @default.
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