Journal article
Effect of Mutation of the Tetratricopeptide Repeat and Asparatate-Proline 2 Domains of Sti1 on Hsp90 Signaling and Interaction in Saccharomyces cerevisiae
Genetics (Austin), Vol.172(1), pp.41-51
01/2006
Handle:
https://hdl.handle.net/2376/115600
PMCID: PMC1456168
PMID: 16219779
Abstract
Through simultaneous interactions with Hsp70 and Hsp90 via separate tetratricopeptide repeat (TPR) domains, the cochaperone protein Hop/Sti1 has been proposed to play a critical role in the transfer of client proteins from Hsp70 to Hsp90. However, no prior mutational analysis demonstrating a critical
in vivo
role for the TPR domains of Sti1 has been reported. We used site-directed mutagenesis of the TPR domains combined with a genetic screen to isolate mutations that disrupt Sti1 function. A single amino acid alteration in TPR2A disrupted Hsp90 interaction
in vivo
but did not significantly affect function. However, deletion of a conserved residue in TPR2A or mutations in the carboxy-terminal DP2 domain completely disrupted Sti1 function. Surprisingly, mutations in TPR1, previously shown to interact with Hsp70, were not sufficient to disrupt
in vivo
functions unless combined with mutations in TPR2B, suggesting that TPR1 and TPR2B have redundant or overlapping
in vivo
functions. We further examined the genetic and physical interaction of Sti1 with a mutant form of Hsp90, providing insight into the importance of the TPR2A domain of Sti1 in regulating Hsp90 function.
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Details
- Title
- Effect of Mutation of the Tetratricopeptide Repeat and Asparatate-Proline 2 Domains of Sti1 on Hsp90 Signaling and Interaction in Saccharomyces cerevisiae
- Creators
- Gary Flom - Department of Microbiology, Molecular Biology and Biochemistry and the Center for Reproductive Biology, University of Idaho, Moscow, Idaho 83844-3052Janae Weekes - Department of Microbiology, Molecular Biology and Biochemistry and the Center for Reproductive Biology, University of Idaho, Moscow, Idaho 83844-3052Julia J Williams - Department of Microbiology, Molecular Biology and Biochemistry and the Center for Reproductive Biology, University of Idaho, Moscow, Idaho 83844-3052Jill L Johnson - Department of Microbiology, Molecular Biology and Biochemistry and the Center for Reproductive Biology, University of Idaho, Moscow, Idaho 83844-3052
- Publication Details
- Genetics (Austin), Vol.172(1), pp.41-51
- Academic Unit
- UNKNOWN
- Publisher
- Copyright © 2006 by the Genetics Society of America
- Identifiers
- 99900548055901842
- Language
- English
- Resource Type
- Journal article