522 VNFA_AZOVI MSSLPQYCECGLGECRTDVLPLLYEMSQIATESGDLSSIISILLRLMKRHMKVVRGMVTLYDRDSGSIVLHESFGLSPEEAGKGVYLLGEGIIGRVVETGQSIVVPCIRDEPAFLNRTGSRDRDSDDANLSFICVPILRGRQVMGTISAERLYDNAELLKLDVEVLSILATTTAQAVELYLVENVENVALEAENRRLRSALGERFKPANIIGNSKPMLEVYQLIERVVRTRTTVLILGESGVGKELVAGAIHYNSPAAKGPFVKFNCASLPESVIESELFGHEKGSFTGAIGLRKGRFEEAAGGTIFLDEVGEMSLTTQAKLLRVLQERSFERVGGNTTIHVDLRVIAATNRNLAEMVADGTFAEDLYYRLNVFPITIPPLRERGSDIITLADHFVSRFSREMGIEVNRISTPRLNMLQSYQWPGNVRELENVIERAMLLSEDGVIHGYHLPPSLQAPVVGDSEAPPDGLEARLGAIEYELIVEALKLHHGNMTEAATHLGLTARVLGLRMGKYNLNYKDYR Nitrogen fixation protein vnfA Required for the expression of the V-dependent nitrogen fixation system in Azotobacter vinelandii. It is required for the regulation of nitrogenase 2 transcription. Interacts with sigma- 54. vnfA