>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=98.71  E-value=3.3e-09  Score=69.18  Aligned_cols=58  Identities=26%  Similarity=0.629  Sum_probs=51.6

Q ss_pred             CHHCCCCCCCCHHHHCCCCCCCC--CCCEEEEEHHHCCCCCHHHHHHHHHHCCCCCCCCH
Q ss_conf             72208979975267477743114--67447994013025771587874200256676346
Q gi|254780416|r    6 TENCILCKHTDCVEVCPVDCFYE--GENFLAIHPDECIDCGVCEPECPVDAIKPDTEPGL   63 (113)
Q Consensus         6 ~~~C~~C~~~~Cv~~CP~~ai~~--~~~~~~id~~~Ci~Cg~C~~~CP~~AI~~d~~~~~   63 (113)
T Consensus       180 PRlCEHClNPaCvasCPSGAiYKREEDGivLiDQ~~CRgWR~C~sgCPYKKiYfNW~~gK  239 (495)
T TIGR01660       180 PRLCEHCLNPACVASCPSGAIYKREEDGIVLIDQDKCRGWRMCISGCPYKKIYFNWKTGK  239 (495)
T ss_pred             CHHHHHCCCCCHHCCCCCCCCCEEECCCCEEEECCCCCCCCEEECCCCCCCEEECCCCCC
T ss_conf             103433277300125887552102048506740256774310105788641253036787