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Title: Inactivation of thioredoxin-like gene alters oxidative stress resistance and reduces cytochrome c oxidase activity in Agrobacterium tumefaciens
Authors: Weerachai Tanboon
Tatsanee Chuchue
Paiboon Vattanaviboon
Skorn Mongkolsuk
Chulabhorn Research Institute
Mahidol University
Chulabhorn Graduate Institute
Keywords: Biochemistry, Genetics and Molecular Biology;Immunology and Microbiology
Issue Date: 1-Jun-2009
Citation: FEMS Microbiology Letters. Vol.295, No.1 (2009), 110-116
Abstract: Thioredoxin-like protein (TlpA) is a membrane-anchored periplasmic protein that contains a thioredoxin domain at its C-terminus. An Agrobacterium tumefaciens mutant lacking functional tlpA shows increased sensitivity to a superoxide generator, increased resistance to H2O2, and reduced cytochrome c oxidase activity. Whereas the levels of antioxidant enzymes, including total superoxide dismutase (SOD) and catalases, are unaltered, high expression of periplasmic SOD partially restores the superoxide hypersensitivity of the mutant, suggesting an accumulation of superoxide anions in the periplasm. The change in the ability of the mutant to cope with H 2O2 stress is independent of OxyR, an H2O 2 sensor and transcription regulator. The presented data indicate that TlpA not only is involved in the proper assembly of cytochrome c but is also implicated in the bacterial oxidative stress response. © 2009 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.
ISSN: 15746968
Appears in Collections:Scopus 2006-2010

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