HHsearch alignment for GI: 254781149 and conserved domain: cd02040

>cd02040 NifH NifH gene encodes component II (iron protein) of nitrogenase. Nitrogenase is responsible for the biological nitrogen fixation, i.e. reduction of molecular nitrogen to ammonia. NifH consists of two oxygen-sensitive metallosulfur proteins: the mollybdenum-iron (alternatively, vanadium-iron or iron-iron) protein (commonly referred to as component 1), and the iron protein (commonly referred to as component 2). The iron protein is a homodimer, with an Fe4S4 cluster bound between the subunits and two ATP-binding domains. It supplies energy by ATP hydrolysis, and transfers electrons from reduced ferredoxin or flavodoxin to component 1 for the reduction of molecular nitrogen to ammonia.
Probab=95.74  E-value=0.017  Score=37.67  Aligned_cols=35  Identities=23%  Similarity=0.286  Sum_probs=21.4

Q ss_pred             EEEECCCCHHHHHHHHHHHHHHHHCCCCEEEECCC
Q ss_conf             88706874148899999999963022323641167
Q gi|254781149|r  145 ILIGARPSMGKTTFALSTALHMAMSGHGVAFFSLE  179 (266)
Q Consensus       145 iviaaRP~mGKTa~alnia~~~a~~g~~Vl~fSlE  179 (266)
T Consensus         4 Iai~GKGGVGKTTtavNLA~aLa~~GkkVlliDaD   38 (270)
T cd02040           4 IAIYGKGGIGKSTTTQNLSAALAEMGKKVMIVGCD   38 (270)
T ss_pred             EEEECCCCCCHHHHHHHHHHHHHHCCCEEEEECCC
T ss_conf             99979985778999999999999879949998657