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The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions
The heat shock protein, Hsp60, is one of the most abundant proteins in Helicobacter pylori. Given its sequence homology to the Escherichia coli Hsp60 or GroEL, Hsp60 from H. pylori would be expected to function as a molecular chaperone in this organism. H. pylori is an organism that grows on the gas...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5614549/ https://www.ncbi.nlm.nih.gov/pubmed/28955994 http://dx.doi.org/10.1016/j.bbrep.2016.11.011 |
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author | Mendoza, Jose A. Weinberger, Kevin K. Swan, Matthew J. |
author_facet | Mendoza, Jose A. Weinberger, Kevin K. Swan, Matthew J. |
author_sort | Mendoza, Jose A. |
collection | PubMed |
description | The heat shock protein, Hsp60, is one of the most abundant proteins in Helicobacter pylori. Given its sequence homology to the Escherichia coli Hsp60 or GroEL, Hsp60 from H. pylori would be expected to function as a molecular chaperone in this organism. H. pylori is an organism that grows on the gastric epithelium, where the pH can fluctuate between neutral and 4.5 and the intracellular pH can be as low as 5.0. This study was performed to test the ability of Hsp60 from H. pylori to function as a molecular chaperone under mildly acidic conditions. We report here that Hsp60 could suppress the acid-induced aggregation of alcohol dehydrogenase (ADH) in the 7.0–5.0 pH range. Hsp60 was found to undergo a conformational change within this pH range. It was also found that exposure of hydrophobic surfaces of Hsp60 is significant and that their exposure is increased under acidic conditions. Although, alcohol dehydrogenase does not contain exposed hydrophobic surfaces, we found that their exposure is triggered at low pH. Our results demonstrate that Hsp60 from H. pylori can function as a molecular chaperone under acidic conditions and that the interaction between Hsp60 and other proteins may be mediated by hydrophobic interactions. |
format | Online Article Text |
id | pubmed-5614549 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-56145492017-09-27 The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions Mendoza, Jose A. Weinberger, Kevin K. Swan, Matthew J. Biochem Biophys Rep Research Article The heat shock protein, Hsp60, is one of the most abundant proteins in Helicobacter pylori. Given its sequence homology to the Escherichia coli Hsp60 or GroEL, Hsp60 from H. pylori would be expected to function as a molecular chaperone in this organism. H. pylori is an organism that grows on the gastric epithelium, where the pH can fluctuate between neutral and 4.5 and the intracellular pH can be as low as 5.0. This study was performed to test the ability of Hsp60 from H. pylori to function as a molecular chaperone under mildly acidic conditions. We report here that Hsp60 could suppress the acid-induced aggregation of alcohol dehydrogenase (ADH) in the 7.0–5.0 pH range. Hsp60 was found to undergo a conformational change within this pH range. It was also found that exposure of hydrophobic surfaces of Hsp60 is significant and that their exposure is increased under acidic conditions. Although, alcohol dehydrogenase does not contain exposed hydrophobic surfaces, we found that their exposure is triggered at low pH. Our results demonstrate that Hsp60 from H. pylori can function as a molecular chaperone under acidic conditions and that the interaction between Hsp60 and other proteins may be mediated by hydrophobic interactions. Elsevier 2016-11-27 /pmc/articles/PMC5614549/ /pubmed/28955994 http://dx.doi.org/10.1016/j.bbrep.2016.11.011 Text en © 2016 Published by Elsevier B.V. http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Research Article Mendoza, Jose A. Weinberger, Kevin K. Swan, Matthew J. The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
title | The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
title_full | The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
title_fullStr | The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
title_full_unstemmed | The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
title_short | The Hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
title_sort | hsp60 protein of helicobacter pylori displays chaperone activity under acidic conditions |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5614549/ https://www.ncbi.nlm.nih.gov/pubmed/28955994 http://dx.doi.org/10.1016/j.bbrep.2016.11.011 |
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