GONUTS has been updated to MW1.31 Most things seem to be working but be sure to report problems.

Have any questions? Please email us at ecoliwiki@gmail.com

PMID:12586877

From GONUTS
Jump to: navigation, search
Citation

Zhang, Z, Quick, MK, Kanelakis, KC, Gijzen, M and Krishna, P (2003) Characterization of a plant homolog of hop, a cochaperone of hsp90. Plant Physiol. 131:525-35

Abstract

The 90-kD molecular chaperone hsp90 is the key component of a multiprotein chaperone complex that facilitates folding, stabilization, and functional modulation of a number of signaling proteins. The components of the animal chaperone complex include hsp90, hsp70, hsp40, Hop, and p23. The animal Hop functions to link hsp90 and hsp70, and it can also inhibit the ATPase activity of hsp90. We have demonstrated the presence of an hsp90 chaperone complex in plant cells, but not all components of the complex have been identified. Here, we report the isolation and characterization of soybean (Glycine max) GmHop-1, a soybean homolog of mammalian Hop. An analysis of soybean expressed sequence tags, combined with preexisting data in literature, suggested the presence of at least three related genes encoding Hop-like proteins in soybean. Transcripts corresponding to Hop-like proteins in soybean were detected under normal growth conditions, and their levels increased further in response to stress. A recombinant GmHop-1 bound hsp90 and its binding to hsp90 could be blocked by the tetratricopeptide repeat (TPR) domain of rat (Rattus norvegicus) protein phosphatase 5. Deletion of amino acids 325 to 395, adjacent to the TPR2A domain in GmHop-1, resulted in loss of hsp90 binding. In a minimal assembly system, GmHop-1 was able to stimulate mammalian steroid receptor folding. These data show that plant and animal Hop homologs are conserved in their general characteristics, and suggest that a Hop-like protein in plants is an important cochaperone of plant hsp90.

Links

PubMed PMC166829 Online version:10.1104/pp.011940

Keywords

Amino Acid Sequence; Animals; Carrier Proteins/genetics; Cloning, Molecular; DNA, Complementary/chemistry; DNA, Complementary/genetics; Gene Expression Regulation, Plant; HSP70 Heat-Shock Proteins/genetics; HSP70 Heat-Shock Proteins/metabolism; HSP90 Heat-Shock Proteins/genetics; HSP90 Heat-Shock Proteins/metabolism; Heat-Shock Proteins/genetics; Heat-Shock Proteins/metabolism; Molecular Chaperones/genetics; Molecular Chaperones/metabolism; Molecular Sequence Data; Multigene Family; Mutation; Plant Proteins/genetics; Plant Proteins/metabolism; Rats; Recombinant Fusion Proteins/genetics; Recombinant Fusion Proteins/metabolism; Sequence Homology, Amino Acid; Soybeans/genetics; Soybeans/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

SOYBN:HSOP1

enables

GO:0051879: Hsp90 protein binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

SOYBN:HSOP1

involved_in

GO:0070417: cellular response to cold

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

SOYBN:HSOP1

involved_in

GO:0051131: chaperone-mediated protein complex assembly

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

SOYBN:HSOP1

involved_in

GO:0034605: cellular response to heat

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete

SOYBN:HSOP1

involved_in

GO:0009611: response to wounding

ECO:0000270: expression pattern evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

See Help:References for how to manage references in GONUTS.