Roles of siderophore in manganese-oxide reduction by Shewanella oneidensis MR-1.

Abstract:

:Dissimilatory metal-reducing bacteria (DMRB), such as Shewanella oneidensis MR-1, are of great interest for their importance in the biogeochemical cycling of metals and utility in biotechnological processes, such as bioremediation and microbial fuel cells. To identify genes necessary for metal reduction, this study constructed a random transposon-insertion mutant library of MR-1 and screened it for isolating mutants that were deficient in metal reduction. Examination of approximately 5000 mutants on lactate minimal-medium plates containing MnO(2) resulted in the isolation of one mutant, strain N22-7, that showed a decreased MnO(2)-reduction activity. Determination of a transposon-insertion site in N22-7 followed by deletion and complementation experiments revealed that the disruption of SO3030, a siderophore biosynthesis gene, was responsible for the decreased MnO(2)-reduction activity. In ΔSO3030 cells, iron and cytochrome contents were decreased to approximately 50% of those in the wild-type cells, when they were incubated under MnO(2)-reduction conditions. In addition, the transcription of genes encoding outer-membrane cytochromes necessary for metal reduction was repressed in ΔSO3030 under MnO(2)-reduction conditions, while their transcription was upregulated after supplementation of culture media with ferrous iron. These results suggest that siderophore is important for S. oneidensis MR-1 to respire MnO(2), because iron availability influences the expression of cytochromes necessary for metal reduction.

journal_name

FEMS Microbiol Lett

authors

Kouzuma A,Hashimoto K,Watanabe K

doi

10.1111/j.1574-6968.2011.02444.x

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

91-8

issue

1

eissn

0378-1097

issn

1574-6968

journal_volume

326

pub_type

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