7KRT
Restraining state of a truncated Hsp70 DnaK
7KRT の概要
エントリーDOI | 10.2210/pdb7krt/pdb |
関連するPDBエントリー | 7KO2 |
分子名称 | Chaperone protein DnaK, MAGNESIUM ION, ADENOSINE-5'-TRIPHOSPHATE, ... (4 entities in total) |
機能のキーワード | molecular chaperone, hsp70, protein folding, chaperone |
由来する生物種 | Escherichia coli (strain K12) |
タンパク質・核酸の鎖数 | 4 |
化学式量合計 | 262111.62 |
構造登録者 | |
主引用文献 | Wang, W.,Liu, Q.,Liu, Q.,Hendrickson, W.A. Conformational equilibria in allosteric control of Hsp70 chaperones. Mol.Cell, 81:3919-, 2021 Cited by PubMed Abstract: Heat-shock proteins of 70 kDa (Hsp70s) are vital for all life and are notably important in protein folding. Hsp70s use ATP binding and hydrolysis at a nucleotide-binding domain (NBD) to control the binding and release of client polypeptides at a substrate-binding domain (SBD); however, the mechanistic basis for this allostery has been elusive. Here, we first characterize biochemical properties of selected domain-interface mutants in bacterial Hsp70 DnaK. We then develop a theoretical model for allosteric equilibria among Hsp70 conformational states to explain the observations: a restraining state, Hsp70-ATP, restricts ATP hydrolysis and binds peptides poorly, whereas a stimulating state, Hsp70-ATP, hydrolyzes ATP rapidly and has high intrinsic substrate affinity but rapid binding kinetics. We support this model for allosteric regulation with DnaK structures obtained in the postulated stimulating state S with biochemical tests of the S-state interface and with improved peptide-binding-site definition in an R-state structure. PubMed: 34453889DOI: 10.1016/j.molcel.2021.07.039 主引用文献が同じPDBエントリー |
実験手法 | X-RAY DIFFRACTION (2.79 Å) |
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