Publication: Multiple superoxide dismutases in Agrobacterium tumefaciens: Functional analysis, gene regulation, and influence on tumorigenesis
Issued Date
2007-12-01
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ISSN
00219193
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2-s2.0-37449030210
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Bacteriology. Vol.189, No.24 (2007), 8807-8817
Suggested Citation
Panatda Saenkham, Warawan Eiamphungporn, Stephen K. Farrand, Paiboon Vattanaviboon, Skorn Mongkolsuk Multiple superoxide dismutases in Agrobacterium tumefaciens: Functional analysis, gene regulation, and influence on tumorigenesis. Journal of Bacteriology. Vol.189, No.24 (2007), 8807-8817. doi:10.1128/JB.00960-07 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/24474
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Title
Multiple superoxide dismutases in Agrobacterium tumefaciens: Functional analysis, gene regulation, and influence on tumorigenesis
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Abstract
Agrobacterium tumefaciens possesses three iron-containing superoxide dismutases (FeSods) encoded by distinct genes with differential expression patterns. SodBI and SodBII are cytoplasmic isozymes, while SodBIII is a periplasmic isozyme. sodBI is expressed at a high levels throughout all growth phases. sodBII expression is highly induced upon exposure to superoxide anions in a SoxR-dependent manner. sodBIII is expressed only during stationary phase. Analysis of the physiological function of sods reveals that the inactivation of sodBI markedly reduced levels of resistance to a superoxide generator, menadione. A mutant lacking all three Sod enzymes is the most sensitive to menadione treatment, indicating that all sods contribute at various levels towards the overall menadione resistance level. Sods also have important roles in A. tumefaciens virulence toward a host plant. A sodBI but not a sodBII or sodBIII mutant showed marked reduction in its ability to induce tumors on tobacco leaf discs, while the triple sod null mutant is avirulent. Copyright © 2007, American Society for Microbiology. All Rights Reserved.