HHsearch alignment for GI: 254780827 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=95.17  E-value=0.041  Score=34.13  Aligned_cols=36  Identities=31%  Similarity=0.410  Sum_probs=31.9

Q ss_pred             EEEEECCCCCCHHHHHHHHHHHHHHCCCCCEEEEEEC
Q ss_conf             9995278666733799999999973389868999508
Q gi|254780827|r   85 VVGITGSVAVGKSTFARILCILLQQISNFKVSLITTD  121 (311)
Q Consensus        85 IIGIAG~~asGKST~Ar~L~~lL~~~~~~~V~lis~D  121 (311)
T Consensus         3 ~Iai~GKGGVGKTTtavNLA~aLa~~G-kkVlliDaD   38 (270)
T cd02040           3 QIAIYGKGGIGKSTTTQNLSAALAEMG-KKVMIVGCD   38 (270)
T ss_pred             EEEEECCCCCCHHHHHHHHHHHHHHCC-CEEEEECCC
T ss_conf             899979985778999999999999879-949998657