>TIGR01176 fum_red_Fp fumarate reductase, flavoprotein subunit; InterPro: IPR005884 In bacteria two distinct, membrane-bound, enzyme complexes are responsible for the interconversion of fumarate and succinate (1.3.99.1 from EC): fumaratereductase (Frd) is used in anaerobic growth, and succinate dehydrogenase (Sdh) is used in aerobic growth. Both complexes consist of two main components: a membrane-extrinsic component composed of a FAD-binding flavoprotein and an iron-sulphur protein; and an hydrophobic component composed of a membrane anchor protein and/or a cytochrome B. In eukaryotes mitochondrial succinate dehydrogenase (ubiquinone) (1.3.5.1 from EC) is an enzyme composed of two subunits: a FAD flavoprotein and and iron-sulphur protein. The flavoprotein subunit is a protein of about 60 to 70 Kd to which FAD is covalently bound to a histidine residue which is located in the N-terminal section of the protein . The sequence around that histidine is well conserved in Frd and Sdh from various bacterial and eukaryotic species . The terms succinate dehydrogenase and fumarate reductase may be used interchangeably in certain systems. However, a number of species have distinct complexes, with the fumarate reductase active under anaerobic conditions. This model represents the fumarate reductase flavoprotein subunit from several such species in which a distinct succinate dehydrogenase is also found. ; GO: 0016491 oxidoreductase activity, 0006118 electron transport, 0009061 anaerobic respiration.

Probab=95.44  E-value=0.021  Score=36.28  Aligned_cols=34  Identities=41%  Similarity=0.527  Sum_probs=29.5

Q ss_pred             CCCCEEEECCCHHHHHHHHHHHHCC--CCEEEEECC
Q ss_conf             6434899989857999999999879--939999788
Q gi|254780675|r    3 RLYDIILIGSGPAGYVAAIRAAQLG--FKVAIVEYA   36 (481)
Q Consensus         3 ~~yDvvIIG~GpAG~~aA~~~a~~G--~~V~liEk~   36 (481)
T Consensus         2 ~~~~i~viGaGGAGLRaAIA~A~aNP~l~vAliSKV   37 (585)
T TIGR01176         2 LQADIAVIGAGGAGLRAAIAAAEANPHLDVALISKV   37 (585)
T ss_pred             CCCCEEEECCCCHHHHHHHHHHHCCCCCCEEEEEEC
T ss_conf             432367883784468999999840898537898511