Article ; Online: Structures of Hsp90α and Hsp90β bound to a purine-scaffold inhibitor reveal an exploitable residue for drug selectivity.
2019 Volume 87, Issue 10, Page(s) 869–877
Abstract: Hsp90α and Hsp90β are implicated in a number of cancers and neurodegenerative disorders but the lack of selective pharmacological probes confounds efforts to identify their individual roles. Here, we analyzed the binding of an Hsp90α-selective PU ... ...
Abstract | Hsp90α and Hsp90β are implicated in a number of cancers and neurodegenerative disorders but the lack of selective pharmacological probes confounds efforts to identify their individual roles. Here, we analyzed the binding of an Hsp90α-selective PU compound, PU-11-trans, to the two cytosolic paralogs. We determined the co-crystal structures of Hsp90α and Hsp90β bound to PU-11-trans, as well as the structure of the apo Hsp90β NTD. The two inhibitor-bound structures reveal that Ser52, a nonconserved residue in the ATP binding pocket in Hsp90α, provides additional stability to PU-11-trans through a water-mediated hydrogen-bonding network. Mutation of Ser52 to alanine, as found in Hsp90β, alters the dissociation constant of Hsp90α for PU-11-trans to match that of Hsp90β. Our results provide a structural explanation for the binding preference of PU inhibitors for Hsp90α and demonstrate that the single nonconserved residue in the ATP-binding pocket may be exploited for α/β selectivity. |
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MeSH term(s) | Amino Acid Sequence ; Amino Acids/chemistry ; Amino Acids/genetics ; Amino Acids/metabolism ; Drug Development ; Drug Discovery ; HSP90 Heat-Shock Proteins/antagonists & inhibitors ; HSP90 Heat-Shock Proteins/chemistry ; HSP90 Heat-Shock Proteins/genetics ; HSP90 Heat-Shock Proteins/metabolism ; Humans ; Mutation ; Protein Conformation ; Purines/chemistry ; Purines/metabolism ; Sequence Homology |
Chemical Substances | Amino Acids ; HSP90 Heat-Shock Proteins ; HSP90AA2P protein, human ; HSP90AB1 protein, human ; Purines |
Language | English |
Publishing date | 2019-06-12 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural |
ZDB-ID | 806683-8 |
ISSN | 1097-0134 ; 0887-3585 |
ISSN (online) | 1097-0134 |
ISSN | 0887-3585 |
DOI | 10.1002/prot.25750 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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