HspBP1, an Hsp70 cochaperone, has two structural domains and is capable of altering the conformation of the Hsp70 ATPase domain

Catherine A. McLellan, Deborah A. Raynes, Vincent Guerriero

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We present here the first structural information for HspBP1, an Hsp70 cochaperone. Using circular dichroism, HspBP1 was determined to be 35% helical. Although HspBP1 is encoded by seven exons, limited proteolysis shows that it has only two structural domains. Domain I, amino acids 1-83, is largely unstructured. Domain II, amino acids 84-359, is predicted to be 43% helical using circular dichroism. Using limited proteolysis we have also shown that HspBP1 association changes the conformation of the ATPase domain of Hsp70. Only domain II of HspBP1 is required to bring about this conformational change. Truncation mutants of HspBP1 were tested for their ability to inhibit the renaturation of luciferase and bind to Hsp70 in reticulocyte lysate. A carboxyl terminal truncation mutant that was slightly longer than domain I was inactive in these assays, but domain II was sufficient to perform both functions. Domain II was less active than full-length HspBP1 in these assays, and addition of amino acids from domain I improved both functions. These studies show that HspBP1 domain II can bind Hsp70, change the conformation of the ATPase domain, and inhibit Hsp70-associated protein folding.

Original languageEnglish (US)
Pages (from-to)19017-19022
Number of pages6
JournalJournal of Biological Chemistry
Volume278
Issue number21
DOIs
StatePublished - May 23 2003

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Proteolysis
Adenosine Triphosphatases
Conformations
Circular Dichroism
Amino Acids
Assays
Protein folding
Reticulocytes
Protein Folding
Luciferases
Exons
Association reactions

ASJC Scopus subject areas

  • Biochemistry

Cite this

HspBP1, an Hsp70 cochaperone, has two structural domains and is capable of altering the conformation of the Hsp70 ATPase domain. / McLellan, Catherine A.; Raynes, Deborah A.; Guerriero, Vincent.

In: Journal of Biological Chemistry, Vol. 278, No. 21, 23.05.2003, p. 19017-19022.

Research output: Contribution to journalArticle

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AB - We present here the first structural information for HspBP1, an Hsp70 cochaperone. Using circular dichroism, HspBP1 was determined to be 35% helical. Although HspBP1 is encoded by seven exons, limited proteolysis shows that it has only two structural domains. Domain I, amino acids 1-83, is largely unstructured. Domain II, amino acids 84-359, is predicted to be 43% helical using circular dichroism. Using limited proteolysis we have also shown that HspBP1 association changes the conformation of the ATPase domain of Hsp70. Only domain II of HspBP1 is required to bring about this conformational change. Truncation mutants of HspBP1 were tested for their ability to inhibit the renaturation of luciferase and bind to Hsp70 in reticulocyte lysate. A carboxyl terminal truncation mutant that was slightly longer than domain I was inactive in these assays, but domain II was sufficient to perform both functions. Domain II was less active than full-length HspBP1 in these assays, and addition of amino acids from domain I improved both functions. These studies show that HspBP1 domain II can bind Hsp70, change the conformation of the ATPase domain, and inhibit Hsp70-associated protein folding.

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