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J Bacteriol. 2008 Jul;190(13):4596-602. doi: 10.1128/JB.00262-08. Epub 2008 Apr 25.

Salmonella enterica requires ApbC function for growth on tricarballylate: evidence of functional redundancy between ApbC and IscU.

Author information

1
Department of Bacteriology, 1550 Linden Drive, University of Wisconsin, Madison, WI 53706, USA.

Abstract

Mutants of Salmonella enterica lacking apbC have nutritional and biochemical properties indicative of defects in [Fe-S] cluster metabolism. Here we show that apbC is required for S. enterica to use tricarballylate as a carbon and energy source. Tricarballylate catabolism requires three gene products, TcuA, TcuB, and TcuC. Of relevance to this work is the TcuB protein, which has two [4Fe-4S] clusters required for function, making it a logical target for the apbC effect. TcuB activity was 100-fold lower in an apbC mutant than in the isogenic apbC(+) strain. Genetic data show that derepression of the iscRSUA-hscAB-fdx-orf3 operon or overexpression of iscU from a plasmid compensates for the lack of ApbC during growth on tricarballylate. The studies described herein provide evidence that the scaffold protein IscU has a functional overlap with ApbC and that ApbC function is involved in the synthesis of active TcuB.

PMID:
18441067
PMCID:
PMC2446783
DOI:
10.1128/JB.00262-08
[Indexed for MEDLINE]
Free PMC Article

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