Cell reports.pdf (2.59 MB)
c-Abl mediated tyrosine phosphorylation of Aha1 activates its co-chaperone function in cancer cells
journal contribution
posted on 2023-06-09, 00:00 authored by Diana M Dunn, Mark R Woodford, Andrew W Truman, Sandra M Jensen, Jacqualyn Schulman, Tiffany Caza, Taylor C Remillard, David Loiselle, Donald Wolfgeher, Brian S J Blagg, Lucas Franco, Timothy A Haystead, Soumya Daturpalli, Matthias P Mayer, Jane B Trepel, Rhodri M L Morgan, Chrisostomos ProdromouChrisostomos Prodromou, Stephen J Kron, Barry Panaretou, William G Stetler-Stevenson, Steve K Landas, Len Neckers, Gennady Bratslavsky, Dimitra Bourboulia, Mehdi MollapourThe ability of Heat Shock Protein 90 (Hsp90) to hydrolyze ATP is essential for its chaperone function. The co-chaperone Aha1 stimulates Hsp90 ATPase activity, tailoring the chaperone function to specific "client" proteins. The intracellular signaling mechanisms directly regulating Aha1 association with Hsp90 remain unknown. Here, we show that c-Abl kinase phosphorylates Y223 in human Aha1 (hAha1), promoting its interaction with Hsp90. This, consequently, results in an increased Hsp90 ATPase activity, enhances Hsp90 interaction with kinase clients, and compromises the chaperoning of non-kinase clients such as glucocorticoid receptor and CFTR. Suggesting a regulatory paradigm, we also find that Y223 phosphorylation leads to ubiquitination and degradation of hAha1 in the proteasome. Finally, pharmacologic inhibition of c-Abl prevents hAha1 interaction with Hsp90, thereby hypersensitizing cancer cells to Hsp90 inhibitors both in vitro and ex vivo.
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Publication status
- Published
File Version
- Published version
Journal
Cell ReportsISSN
2211-1247Publisher
ElsevierExternal DOI
Issue
6Volume
12Page range
1006-1018Department affiliated with
- Biochemistry Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-01-15First Open Access (FOA) Date
2016-01-15First Compliant Deposit (FCD) Date
2016-01-15Usage metrics
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