ID   ETFB_MEGEL              Reviewed;         270 AA.
AC   O85691;
DT   30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1998, sequence version 1.
DT   03-AUG-2022, entry version 67.
DE   RecName: Full=Electron transfer flavoprotein subunit beta;
DE            Short=Beta-ETF;
DE   AltName: Full=Electron transfer flavoprotein small subunit;
DE            Short=ETFSS;
GN   Name=etfB;
OS   Megasphaera elsdenii.
OC   Bacteria; Firmicutes; Negativicutes; Veillonellales; Veillonellaceae;
OC   Megasphaera.
OX   NCBI_TaxID=907;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=ATCC 25940 / DSM 20460 / JCM 1772 / NCIB 8927;
RX   PubMed=9694853; DOI=10.1074/jbc.273.33.21015;
RA   O'Neill H., Mayhew S.G., Butler G.;
RT   "Cloning and analysis of the genes for a novel electron-transferring
RT   flavoprotein from Megasphaera elsdenii. Expression and characterization of
RT   the recombinant protein.";
RL   J. Biol. Chem. 273:21015-21024(1998).
CC   -!- FUNCTION: The electron transfer flavoprotein serves as a specific
CC       electron acceptor for other dehydrogenases. It transfers the electrons
CC       to the main respiratory chain via ETF-ubiquinone oxidoreductase (ETF
CC       dehydrogenase) (By similarity). {ECO:0000250}.
CC   -!- COFACTOR:
CC       Name=FAD; Xref=ChEBI:CHEBI:57692;
CC       Note=Binds 2 FAD per dimer.;
CC   -!- SUBUNIT: Heterodimer of an alpha and a beta subunit.
CC   -!- SIMILARITY: Belongs to the ETF alpha-subunit/FixB family.
CC       {ECO:0000305}.
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DR   EMBL; AF072475; AAC31169.1; -; Genomic_DNA.
DR   AlphaFoldDB; O85691; -.
DR   SMR; O85691; -.
DR   BioCyc; MetaCyc:MON-21346; -.
DR   GO; GO:0009055; F:electron transfer activity; IEA:InterPro.
DR   CDD; cd01714; ETF_beta; 1.
DR   Gene3D; 3.40.50.620; -; 1.
DR   InterPro; IPR014730; ETF_a/b_N.
DR   InterPro; IPR012255; ETF_b.
DR   InterPro; IPR033948; ETF_beta_N.
DR   InterPro; IPR014729; Rossmann-like_a/b/a_fold.
DR   PANTHER; PTHR21294; PTHR21294; 1.
DR   Pfam; PF01012; ETF; 1.
DR   PIRSF; PIRSF000090; Beta-ETF; 1.
DR   SMART; SM00893; ETF; 1.
PE   3: Inferred from homology;
KW   Electron transport; FAD; Flavoprotein; Transport.
FT   CHAIN           1..270
FT                   /note="Electron transfer flavoprotein subunit beta"
FT                   /id="PRO_0000167879"
SQ   SEQUENCE   270 AA;  29099 MW;  9AC0A46E8FA93397 CRC64;
     MEILVCVKQV PDTAEVKIDP VKHTVIRAGV PNIFNPFDQN ALEAALALKD ADKDVKITLL
     SMGPDQAKDV LREGLAMGAD DAYLLSDRKL GGSDTLATGY ALAQAIKKLA ADKGIEQFDI
     ILCGKQAIDG DTAQVGPQIA CELGIPQITY ARDIKVEGDK VTVQQENEEG YIVTEAQFPV
     LITAVKDLNE PRFPTIRGTM KAKRREIPNL DAAAVAADDA QIGLSGSPTK VRKIFTPPQR
     SGGLVLKVED DNEQAIVDQV MEKLVAQKII