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Chaperone ligand-discrimination by the TPR-domain protein Tah1
journal contribution
posted on 2023-06-08, 09:24 authored by Stefan H Millson, Cara K Vaughan, Chao Zhai, Maruf M U Ali, Barry Panaretou, Peter W Piper, Laurence PearlLaurence Pearl, Chrisostomos ProdromouChrisostomos ProdromouTah1 [TPR (tetratricopeptide repeat)-containing protein associated with Hsp (heat-shock protein) 90] has been identified as a TPR-domain protein. TPR-domain proteins are involved in protein-protein interactions and a number have been characterized that interact either with Hsp70 or Hsp90, but a few can bind both chaperones. Independent studies suggest that Tah1 interacts with Hsp90, but whether it can also interact with Hsp70/Ssa1 has not been investigated. Amino-acid-sequence alignments suggest that Tah1 is most similar to the TPR2b domain of Hop (Hsp-organizing protein) which when mutated reduces binding to both Hsp90 and Hsp70. Our alignments suggest that there are three TPR-domain motifs in Tah1, which is consistent with the architecture of the TPR2b domain. In the present study we find that Tah1 is specific for Hsp90, and is able to bind tightly the yeast Hsp90, and the human Hsp90 alpha and Hsp90 beta proteins, but not the yeast Hsp70 Ssa1 isoforrn. Tah1 acheives ligand discrimination by favourably binding the methionine residue in the conserved MEEVD motif (Hsp90) and positively discriminating against the first valine residue in the VEEVD motif (Ssa1). In the present study we also show that Tah1 can affect the ATPase activity of Hsp90, in common with some other TPR-domain proteins.
History
Publication status
- Published
Journal
Biochemical JournalISSN
0264-6021Publisher
Portland PressPublisher URL
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Volume
413Page range
261-268Department affiliated with
- Sussex Centre for Genome Damage Stability Publications
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- No
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- Yes
Legacy Posted Date
2012-02-06Usage metrics
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