Annexin-like protein from Arabidopsis thaliana rescues delta oxyR mutant of Escherichia coli from H2O2 stress.
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Journal: 1996/November - Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
PUBMED: 8855345
Abstract:
Reactive oxygen species are common causes of cellular damages in all aerobic organisms. In Escherichia coli, the oxyR gene product is a positive regulator of the oxyR regulon that is induced in response to H2O2 stress. To identify genes involved in counteracting oxidative stress in plants, we transformed a delta oxyR mutant of E. coli with an Arabidopsis thaliana cDNA library and selected for clones that restored the ability of the delta oxyR mutant to grow in the presence of H2O2. Using this approach, we isolated a cDNA that has strong homology with the annexin super-gene family. The complemented mutant showed higher catalase activity. mRNA expression of the annexin gene in A. thaliana was higher in roots as compared with other organs and was also increased when the plants were exposed to H2O2 stress or salicylic acid. Based on the results presented in this study, we propose a novel physiological role for annexin in counteracting H2O2 stress.
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Proc Natl Acad Sci U S A 93(20): 11268-11273
PMID: 8855345

Annexin-like protein from Arabidopsis thaliana rescues delta oxyR mutant of Escherichia coli from H2O2 stress.

Abstract

Reactive oxygen species are common causes of cellular damages in all aerobic organisms. In Escherichia coli, the oxyR gene product is a positive regulator of the oxyR regulon that is induced in response to H2O2 stress. To identify genes involved in counteracting oxidative stress in plants, we transformed a delta oxyR mutant of E. coli with an Arabidopsis thaliana cDNA library and selected for clones that restored the ability of the delta oxyR mutant to grow in the presence of H2O2. Using this approach, we isolated a cDNA that has strong homology with the annexin super-gene family. The complemented mutant showed higher catalase activity. mRNA expression of the annexin gene in A. thaliana was higher in roots as compared with other organs and was also increased when the plants were exposed to H2O2 stress or salicylic acid. Based on the results presented in this study, we propose a novel physiological role for annexin in counteracting H2O2 stress.

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Selected References

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Institute of Molecular and Cell Biology, National University of Singapore, Republic of Singapore.
Institute of Molecular and Cell Biology, National University of Singapore, Republic of Singapore.
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Abstract
Reactive oxygen species are common causes of cellular damages in all aerobic organisms. In Escherichia coli, the oxyR gene product is a positive regulator of the oxyR regulon that is induced in response to H2O2 stress. To identify genes involved in counteracting oxidative stress in plants, we transformed a delta oxyR mutant of E. coli with an Arabidopsis thaliana cDNA library and selected for clones that restored the ability of the delta oxyR mutant to grow in the presence of H2O2. Using this approach, we isolated a cDNA that has strong homology with the annexin super-gene family. The complemented mutant showed higher catalase activity. mRNA expression of the annexin gene in A. thaliana was higher in roots as compared with other organs and was also increased when the plants were exposed to H2O2 stress or salicylic acid. Based on the results presented in this study, we propose a novel physiological role for annexin in counteracting H2O2 stress.
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