PROSITE documentation PDOC00816
Electron transfer flavoprotein beta-subunit signature


The electron transfer flavoprotein (ETF) [1,2] 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 consist of an α and a β subunit and which bind one molecule of FAD per dimer. A similar system also exists in some bacteria.

The β subunit of ETF is a protein of about 28 Kd which is structurally related to the bacterial nitrogen fixation protein fixA which could play a role in a redox process and feed electrons to ferredoxin.

Other related proteins are:

  • Escherichia coli hypothetical protein ydiQ.
  • Escherichia coli hypothetical protein ygcR.

As a signature pattern for these proteins, we selected a conserved region which is located in the central section.

Last update:

December 2004 / Pattern and text revised.


Technical section

PROSITE method (with tools and information) covered by this documentation:

ETF_BETA, PS01065; Electron transfer flavoprotein beta-subunit signature  (PATTERN)


1AuthorsFinocchiaro G. Ikeda Y. Ito M. Tanaka K.
TitleBiosynthesis, molecular cloning and sequencing of electron transfer flavoprotein.
SourceProg. Clin. Biol. Res. 321:637-652(1990).
PubMed ID2326318

2AuthorsTsai M.H. Saier M.H. Jr.
TitlePhylogenetic characterization of the ubiquitous electron transfer flavoprotein families ETF-alpha and ETF-beta.
SourceRes. Microbiol. 146:397-404(1995).
PubMed ID8525056

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