Protein
Menaquinone reductase, integral membrane subunit
Organism
Desulfovibrio vulgaris (strain Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303)
Function
Component of the respiratory Qrc complex, that catalyzes the reduction of the menaquinone pool using electrons transferred from the reduced periplasmic cytochrome c3, and which is probably involved in sulfate respiration. Is likely essential for growth on H(2) or formate since the periplasmic hydrogenases and/or formate dehydrogenases act as primary electron donors for the Qrc complex. The QrcD subunit anchors the protein complex to the membrane and likely interacts with the quinone pool.
Similarity
Belongs to the NrfD family.
Sequence
MDKNYNLPVDAELFPEGCERCSLSKFMMWMAFVFVFFGWGLYAAYRVLAEGLGVTGLDDYFGFGLWITFDLAVIALGAGAFFSGLLRYILNIDPLKNIINLAVIIGFLCYSGAMLVLVLDIGQPLRAWFGYWHANVHSMLTEVIFCITCYCLVLIIEYVPLILENRQLNKNKLVHAVAHNFHVMMPLFAGIGAFLSTFHQGSLGGMYGVLFGRPYIYREGFFIWPWTFFLYVLSAVGSGPVFTVLVCTLMEKMTGRKLVSWEVKSLMGKIAGTMLMVYLIFKFADTYAWAYDLLPRQGLTFDQMFTSGWIYGKWMLWAELFYCGLVPAIILIVPALRNNPVLFYSAAILDCIGITINRYVMTVQALAIPVMPFDSWESYLPNWAEWGASVMIVAYAALVLSLSYRYLPIFPQEAELNRK