Role of Red Gsu in stress Response and Fe(III) Reduction in Geobacter Sulfurreducens
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Role of RelGsu in stress response and Fe(III) reduction in Geobacter sulfurreducens.
Geobacter species are key members of the microbial community in many subsurface environments in which dissimilatory metal reduction is an important process. The genome of Geobacter sulfurreducens contains a gene designated rel(Gsu), which encodes a RelA homolog predicted to catalyze both the synthesis and the degradation of guanosine 3',5'-bispyrophosphate (ppGpp), a regulatory molecule that si...
متن کاملMacA, a diheme c-type cytochrome involved in Fe(III) reduction by Geobacter sulfurreducens.
A 36-kDa diheme c-type cytochrome abundant in Fe(III)-respiring Geobacter sulfurreducens, designated MacA, was more highly expressed during growth with Fe(III) as the electron acceptor than with fumarate. Although MacA has homology to proteins with in vitro peroxidase activity, deletion of macA had no impact on response to oxidative stress. However, the capacity for Fe(III) reduction was greatl...
متن کاملOuter cell surface components essential for Fe(III) oxide reduction by Geobacter metallireducens.
Geobacter species are important Fe(III) reducers in a diversity of soils and sediments. Mechanisms for Fe(III) oxide reduction have been studied in detail in Geobacter sulfurreducens, but a number of the most thoroughly studied outer surface components of G. sulfurreducens, particularly c-type cytochromes, are not well conserved among Geobacter species. In order to identify cellular components ...
متن کاملTitle: Outer Cell Surface Components Essential for Fe(III) Oxide Reduction by Geobacter
24 Geobacter species are important Fe(III) reducers in a diversity of soils and sediments. 25 Mechanisms for Fe(III) oxide reduction have been studied in detail in Geobacter sulfurreducens, 26 but a number of the most thoroughly studied outer surface components of G. sulfurreducens, 27 particularly c-type cytochromes, are not well conserved among Geobacter species. In order to 28 identify cellu...
متن کاملTwo putative c-type multiheme cytochromes required for the expression of OmcB, an outer membrane protein essential for optimal Fe(III) reduction in Geobacter sulfurreducens.
Deletion of two homologous Geobacter sulfurreducens c-type cytochrome genes, omcG and omcH, decreased the rate of Fe(III) reduction and decreased the level of an outer membrane cytochrome critical for Fe(III) reduction, OmcB, without affecting its transcription. Expression of either gene restored Fe(III) reduction and OmcB expression, suggesting functional similarity.
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