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Chaperone ligand-discrimination by the TPR-domain protein Tah1

Millson, S.H. and Vaughan, Cara K. and Zhai, C. and Ali, M.M.U. and Panaretou, B. and Piper, P.W. and Pearl, L.H. and Prodromou, C. (2008) Chaperone ligand-discrimination by the TPR-domain protein Tah1. Biochemical Journal 413 , pp. 261-268. ISSN 0264-6021.

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Official URL: http://dx.doi.org/10.1042/BJ20080105

Abstract

Tah1 [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 Hsp90α and Hsp90β proteins, but not the yeast Hsp70 Ssa1 isoform. 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.

Item Type: Article
Keyword(s) / Subject(s): ATPase activity, heat-shock protein 90 (Hsp90), heat-shock protein 70 (Hsp70), tetratricopeptide-repeat-containing protein associated with heat-shock protein 90 (Tah1), tetratricopeptide repeat (TPR) domain, stress-inducible protein 1/heat-shock protein organizing protein/p60 (Sti1/Hop/p60)
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Biological Sciences
Depositing User: Administrator
Date Deposited: 04 Aug 2010 14:09
Last Modified: 17 Apr 2013 12:17
URI: http://eprints.bbk.ac.uk/id/eprint/1152

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