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Title 

The quorum sensing-dependent gene katG of Burkholderia glumae is important for protection from visible light

Authors 

H ChunO ChoiE GooN KimH KimY KangJ KimJae Sun MoonI Hwang

Publisher 

American Society for Microbiology

Issue Date 

2009

Citation 

Journal of Bacteriology, vol. 191, no. 13, pp. 4152-4157

Abstract 

Quorum sensing (QS) plays important roles in the pathogenicity of Burkholderia glumae, the causative agent of bacterial rice grain rot. We determined how QS is involved in catalase expression in B. glumae. The QS-defective mutant of B. glumae exhibited less catalase activity than wild-type B. glumae. A β-glucuronidase assay of a katG::Tn3-gusA78 reporter fusion protein revealed that katG expression is under the control of QS. Furthermore, katG expression was upregulated by QsmR, a transcriptional activator for flagellar-gene expression that is regulated by QS. A gel mobility shift assay confirmed that QsmR directly activates katG expression. The katG mutant produced toxoflavin but exhibited less severe disease than BGR1 on rice panicles. Under visible light conditions and a photon flux density of 61.6 μmol-1 m-2, the survival rate of the katG mutant was 105-fold lower than that of BGR1. This suggests that KatG is a major catalase that protects bacterial cells from visible light, which probably results in less severe disease caused by the katG mutant.

ISSN 

0021-9193

Link 

http://dx.doi.org/10.1128/JB.00227-09

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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