>TIGR01660 narH nitrate reductase, beta subunit; InterPro: IPR006547 The nitrate reductase enzyme complex allows bacteria to use nitrate as an electron acceptor during anaerobic growth. The enzyme complex consists of a tetramer that has an alpha, beta and 2 gamma subunits. The alpha and beta subunits have catalytic activity and the gamma subunits attach the enzyme to the membrane and are b-type cytochromes that receive electrons from the quinone pool and transfers them to the beta subunit. The sequences in this family are the beta subunit for nitrate reductase I (narH) and nitrate reductase II (narY) for Gram-positive and Gram-negative bacteria. A few thermophiles and archaea also match the model. A number of the sequences in this set are experimentally characterised, these include: E.Coli NarH (P11349 from SWISSPROT) and NarY (P19318 from SWISSPROT) , , P42176 from SWISSPROT from Bacillus subtilis, and related proteins from Psuedomonas fluorescens, Paracoccus denitrificans, and Halomonas halodenitrificans.; GO: 0008940 nitrate reductase activity, 0042126 nitrate metabolic process, 0009325 nitrate reductase complex.

Probab=93.66  E-value=0.032  Score=33.39  Aligned_cols=49  Identities=37%  Similarity=0.634  Sum_probs=37.6

Q ss_pred             CEECCCCHHHHHHCCCCCCCCCCCCCCCEEEEEEEEEHHHCCCCCCCHHHCCCCEEECC
Q ss_conf             21345223253308832101224544733577888505555868872333783103036
Q gi|254780861|r   63 CIACKLCEAICPAQAITIESGPRCHDGTRRTVRYDIDMIKCIYCGLCQEACPVDAIVEG  121 (163)
Q Consensus        63 Ci~C~~C~~~CP~~aI~i~~~~~~~~~~~~~~~~~id~~~Ci~Cg~Cv~vCP~~AI~~~  121 (163)
T Consensus       186 ClN-PaCvasCPSGAiY----KREEDGiv-----LiDQ~~CRgWR~C~sgCPYKKiYfN  234 (495)
T TIGR01660       186 CLN-PACVASCPSGAIY----KREEDGIV-----LIDQDKCRGWRMCISGCPYKKIYFN  234 (495)
T ss_pred             CCC-CCHHCCCCCCCCC----EEECCCCE-----EEECCCCCCCCEEECCCCCCCEEEC
T ss_conf             277-3001258875521----02048506-----7402567743101057886412530