NADH-ubiquinone oxidoreductase 75 kDa subunit, mitochondrial (NDUFS1)

Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is thought to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain.

The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity). This is the largest subunit of complex I and it is a part of the iron-sulfur (IP) fragment of the enzyme.