title: MacA, a diheme c-type cytochrome involved in Fe(III) reduction by Geobacter sulfurreducens.
abstract: 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 greatly diminished, indicating that MacA, which is predicted to be localized in the periplasm, is a key intermediate in electron transfer to Fe(III).
authors.affiliation: Department of Microbiology, 203 Morrill Science Center IVN, University of Massachusetts Amherst, Amherst, MA 01003, USA.
authors.forename: Jessica E
authors.initials: JE
authors.lastname: Butler
authors.forename: Franz
authors.initials: F
authors.lastname: Kaufmann
authors.forename: Maddalena V
authors.initials: MV
authors.lastname: Coppi
authors.forename: Cinthia
authors.initials: C
authors.lastname: Núñez
authors.forename: Derek R
authors.initials: DR
authors.lastname: Lovley
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D003574:Cytochrome c Group / Q000235:genetics / Q000378:metabolism*; D020564:Deltaproteobacteria / Q000201:enzymology* / Q000254:growth & development; D004579:Electron Transport; D005290:Ferric Compounds / Q000378:metabolism*; D017353:Gene Deletion; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction
chemical_list: D001426:Bacterial Proteins; D003574:Cytochrome c Group; D005290:Ferric Compounds