Abstract:
:Marinobacter santoriniensis NKSG1(T) is a mesophilic, dissimilatory arsenate-reducing and arsenite-oxidizing bacterium isolated from an arsenate-reducing enrichment culture. The inoculum was obtained from arsenic-rich shallow marine hydrothermal sediment from Santorini, Greece, with evidence of arsenic redox cycling. Growth studies demonstrated M. santoriniensis NKSG1(T) is capable of conserving energy from the reduction of arsenate [As(V)] with acetate or lactate as the electron donor, and of oxidizing arsenite [As(III)] heterotrophically with oxygen as the electron acceptor. The oxidation of As(III) coincided with the expression of the aoxB gene encoding for the catalytic molybdopterin subunit of the heterodimeric arsenite oxidase operon, indicating the reaction is enzymatically controlled, and M. santoriniensis NKSG1(T) is a heterotrophic As(III)-oxidizing bacterium. Although it is clear that this organism also performs dissimilatory As(V) reduction, no amplification of the arrA arsenate reductase gene was attained using a range of primers and PCR conditions. Marinobacter santoriniensis NKSG1(T) belongs to a genus of bacteria widely occurring in marine environments, including hydrothermal sediments, and is among the first marine bacteria shown to be capable of either anaerobic As(V) respiration or aerobic As(III) oxidation.
journal_name
Environ Microbioljournal_title
Environmental microbiologyauthors
Handley KM,Héry M,Lloyd JRdoi
10.1111/j.1462-2920.2009.01890.xsubject
Has Abstractpub_date
2009-06-01 00:00:00pages
1601-11issue
6eissn
1462-2912issn
1462-2920pii
EMI1890journal_volume
11pub_type
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