ETFB: Proteins and Enzymes

ETFB is a is an electron-transfer-flavoprotein, (beta polypeptide), and a subcomponent of Electron transfer flavoprotein (ETF). ETF exists in the mitochondrial matrix as a heterodimer of 30-kD alpha subunits (ETFA) and 28-kD beta subunits (ETFB) and contains 1 flavin adenine dinucleotide (FAD) and 1 adenosine 5-prime monophosphate (AMP) per heterodimer. This electron transfer flavoprotein serves as a specific electron acceptor for several dehydrogenases and transfers the electrons to the main mitochondrial respiratory chain via ETF-ubiquinone oxidoreductase (ETF dehydrogenase).