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-Structure paper
タイトル | Phosphorylation activates the yeast small heat shock protein Hsp26 by weakening domain contacts in the oligomer ensemble. |
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ジャーナル・号・ページ | Nat Commun, Vol. 12, Issue 1, Page 6697, Year 2021 |
掲載日 | 2021年11月18日 |
著者 | Moritz Mühlhofer / Carsten Peters / Thomas Kriehuber / Marina Kreuzeder / Pamina Kazman / Natalia Rodina / Bernd Reif / Martin Haslbeck / Sevil Weinkauf / Johannes Buchner / |
PubMed 要旨 | Hsp26 is a small heat shock protein (sHsp) from S. cerevisiae. Its chaperone activity is activated by oligomer dissociation at heat shock temperatures. Hsp26 contains 9 phosphorylation sites in ...Hsp26 is a small heat shock protein (sHsp) from S. cerevisiae. Its chaperone activity is activated by oligomer dissociation at heat shock temperatures. Hsp26 contains 9 phosphorylation sites in different structural elements. Our analysis of phospho-mimetic mutations shows that phosphorylation activates Hsp26 at permissive temperatures. The cryo-EM structure of the Hsp26 40mer revealed contacts between the conserved core domain of Hsp26 and the so-called thermosensor domain in the N-terminal part of the protein, which are targeted by phosphorylation. Furthermore, several phosphorylation sites in the C-terminal extension, which link subunits within the oligomer, are sensitive to the introduction of negative charges. In all cases, the intrinsic inhibition of chaperone activity is relieved and the N-terminal domain becomes accessible for substrate protein binding. The weakening of domain interactions within and between subunits by phosphorylation to activate the chaperone activity in response to proteotoxic stresses independent of heat stress could be a general regulation principle of sHsps. |
リンク | Nat Commun / PubMed:34795272 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 7.8 - 16.45 Å |
構造データ | EMDB-12766: Single particle cryo-EM reconstruction of just the top two rings of a 40-mer assembly of recombinant yeast Hsp26 S207E mutant. EMDB-12771: EMDB-12772: EMDB-12773: EMDB-13748: |
由来 |
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キーワード | CHAPERONE / small heat shock proteins / Hsp26 S207E mutant |