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We have isolated a homolog for the flavoprotein subunit of succinate dehydrogenase [succinate:(acceptor) oxidoreductase, EC 1.3.99.1] from Saccharomyces cerevisiae and used the obtained peptide sequences to clone and characterize the corresponding gene. It contained an open reading frame of 1923 base pairs and encoded a protein of 640 amino acids (M(r), 70,238) that showed approximately 49% and approximately 28% identity with the Escherichia coli and Bacillus subtilis enzymes, respectively. All features of the FAD cofactor binding site were completely conserved. Comparison of the deduced protein sequence with the N-terminal sequence determined from the isolated protein revealed an N-terminal extension of 28 amino acids that presumably represents a mitochondrial signal sequence. After in vitro transcription and translation, the preprotein was efficiently imported into isolated yeast mitochondria, cleaved to its mature form, and assembled into the membrane-bound succinate dehydrogenase complex.

Primary structure, import, and assembly of the yeast homolog of succinate dehydrogenase flavoprotein.