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IscR plays a role in oxidative stress resistance and pathogenicity of a plant pathogen, Xanthomonas campestris.

Abstract：

:Iron-sulfur ([Fe-S]) cluster is an essential cofactor of proteins involved in various physiological processes including cellular defense against oxidative stress. In Xanthomonas campestris pv. campestris (Xcc), IscR plays a negative role in regulation of the transcription of [Fe-S] assembly genes, iscR-sufBCDS. The expression level of sufBCDS was up-regulated in an Xcc iscR mutant. In addition, the iscR promoter activity in an Xcc iscR mutant was also higher than the wild-type strain, indicating an autoregulatory circuit. Purified IscR was shown to bind at the iscR promoter region and three putative IscR binding sites were identified. The expression of iscR-suf operon was highly induced by oxidant treatments and iron limited conditions. The iscR mutant showed increased sensitivity toward hydrogen peroxide phenotype but, surprisingly, had hyper-resistant phenotype toward plumbagin compared to the wild-type strain. Most importantly, the iscR mutant was impaired in its ability to cause lesion on leaves of a compatible host plant, Chinese radish (Raphanus sativus). These results demonstrate that a transcription regulator gene, iscR, negatively regulates genes involved in [Fe-S] biosynthesis and plays a role in oxidative stress response and pathogenesis of Xcc.

journal_name

Microbiol Res

journal_title

Microbiological research

authors

Fuangthong M,Jittawuttipoka T,Wisitkamol R,Romsang A,Duang-nkern J,Vattanaviboon P,Mongkolsuk S

doi

10.1016/j.micres.2014.08.004

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

139-46

eissn

0944-5013

issn

1618-0623

pii

S0944-5013(14)00090-1

journal_volume

170

pub_type

杂志文章

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