An acetylation site in the middle domain of Hsp90 regulates chaperone function

Heat-shock protein 90 (Hsp90) chaperones a key subset of signaling proteins and is necessary for malignant transformation. Hsp90 is subject to an array of posttranslational modifications that affect its function, including acetylation. Histone deacetylase (HDAC) inhibitors and knockdown of HDAC6 ind...

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Published in:Molecular cell Vol. 25; no. 1; p. 151
Main Authors: Scroggins, Bradley T, Robzyk, Kenneth, Wang, Dongxia, Marcu, Monica G, Tsutsumi, Shinji, Beebe, Kristin, Cotter, Robert J, Felts, Sara, Toft, David, Karnitz, Larry, Rosen, Neal, Neckers, Len
Format: Journal Article
Language:English
Published: United States 12.01.2007
Subjects:
Acetylation
Amino Acid Sequence
Animals
Cercopithecus aethiops
Checkpoint Kinase 1
COS Cells
HSP90 Heat-Shock Proteins - chemistry
HSP90 Heat-Shock Proteins - metabolism
Humans
Lysine - metabolism
Mice
Molecular Sequence Data
Mutant Proteins - chemistry
Mutant Proteins - metabolism
Mutation - genetics
NIH 3T3 Cells
Protein Binding
Protein Kinases - metabolism
Protein Structure, Tertiary
Saccharomyces cerevisiae - cytology
ISSN:1097-2765
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Summary:Heat-shock protein 90 (Hsp90) chaperones a key subset of signaling proteins and is necessary for malignant transformation. Hsp90 is subject to an array of posttranslational modifications that affect its function, including acetylation. Histone deacetylase (HDAC) inhibitors and knockdown of HDAC6 induce Hsp90 acetylation and inhibit its activity. However, direct determination of the functional consequences of Hsp90 acetylation has awaited mapping of specific sites. We now demonstrate that Hsp90 K294 is acetylated. Mutational analysis of K294 shows that its acetylation status is a strong determinant of client protein and cochaperone binding. In yeast, Hsp90 mutants that cannot be acetylated at K294 have reduced viability and chaperone function compared to WT or to mutants that mimic constitutive acetylation. These data suggest that acetylation/deacetylation of K294 plays an important role in regulating the Hsp90 chaperone cycle.
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ISSN:1097-2765
DOI:10.1016/j.molcel.2006.12.008