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NADH:ubiquinone oxidoreductase, NDUFS5-15kDa This is a family of short, approximately 105 amino acid residue, proteins which form part of NADH:ubiquinone oxidoreductase complex I. Complex I is the first multisubunit inner membrane protein complex of the mitochondrial electron transport chain and it transfers two electrons from NADH to ubiquinone. The protein carries four highly conserved cysteine residues but these do not appear to be in a configuration which would favour metal binding so the exact function of the protein is uncertain.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",