>gnl|CDD|30172 cd01985, ETF, The electron transfer flavoprotein (ETF) serves as a specific electron acceptor for various mitochondrial dehydrogenases. ETF transfers electrons to the main respiratory chain via ETF-ubiquinone oxidoreductase. ETF is an heterodimer that consists of an alpha and a beta subunit which binds one molecule of FAD per dimer . A similar system also exists in some bacteria. The homologous pair of proteins (FixA/FixB) are essential for nitrogen fixation. The alpha subunit of ETF is structurally related to the bacterial nitrogen fixation protein fixB which could play a role in a redox process and feed electrons to ferredoxin. The beta subunit protein is distantly related to and forms a heterodimer with the alpha subunit.. Length = 181

Score = 131 bits (330), Expect = 2e-31 Identities = 72/206 (34%), Positives = 106/206 (51%), Gaps = 31/206 (15%) Query: 2 KILVPIKGVINYNTKVRIKNDYSGIETENTKISMNPFDEIALEESLQLREKGIATEVIVV 61 KILV ++ V + V +NP D A+E +L+L+E G EV + Sbjct: 1 KILVLVEHVPDTAELV-----------------LNPLDLEAVEAALRLKEYG--GEVTAL 41 Query: 62 SIGSCKVEEVLKNSLAMGADRGILIESN--ETLEPLSIAKILREIVKKENPIIVIAGKQT 119 IG E L+ +LAMGAD+ +L+E +P + AK L ++KKE P +++AG + Sbjct: 42 VIGPPAAEVALREALAMGADKVLLVEDPALAGYDPEATAKALAALIKKEKPDLILAGATS 101 Query: 120 TDNESNQTGQMLAALMRWPQATFVSNIKIIDNHAIVTREV--GHGTMTMETP-LPAVITV 176 Q +AAL+ PQ + V+ ++I VTR + G+G T+E+P LPAVITV Sbjct: 102 I---GKQLAPRVAALLGVPQISDVTKLEIDGGDLTVTRPIYAGNGLETVESPDLPAVITV 158 Query: 177 DLNLNEPRYISLPNIIKARKKRIEKK 202 EPRY S P +KK +EK Sbjct: 159 RPGAFEPRYPSGPG----KKKPVEKV 180

RPSBLAST alignment for GI: 254780368 and conserved domain: cd01985