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Chun, Heejin,Choi, Okhee,Goo, Eunhye,Kim, Nayeon,Kim, Hongsup,Kang, Yongsung,Kim, Jinwoo,Moon, Jae Sun,Hwang, Ingyu American Society for Microbiology 2009 Journal of Bacteriology Vol.191 No.13
<B>ABSTRACT</B><P>Quorum sensing (QS) plays important roles in the pathogenicity of <I>Burkholderia glumae</I>, the causative agent of bacterial rice grain rot. We determined how QS is involved in catalase expression in <I>B. glumae</I>. The QS-defective mutant of <I>B. glumae</I> exhibited less catalase activity than wild-type <I>B. glumae</I>. A β-glucuronidase assay of a <I>katG</I>::Tn<I>3-gusA78</I> reporter fusion protein revealed that <I>katG</I> expression is under the control of QS. Furthermore, <I>katG</I> 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 <I>katG</I> expression. The <I>katG</I> 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<SUP>−1</SUP> m<SUP>−2</SUP>, the survival rate of the <I>katG</I> mutant was 10<SUP>5</SUP>-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 <I>katG</I> mutant.</P>
Electric Field Control of Nonvolatile Four-state Magnetization at Room Temperature
Sae Hwan Chun,Yi Sheng Chai,Byung-Gu Jeon,Hyung Joon Kim,Yoon Seok Oh,Ingyu Kim,Hanbit Kim,Byeong Jo Jeon,So Young Haam,Ju-Young Park,Suk Ho Lee,Kee Hoon Kim,Jae-Ho Chung,Jae-Hoon Park 한국자기학회 2012 한국자기학회 학술연구발표회 논문개요집 Vol.2012 No.5