Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed 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).
Hu, Nie, Chen, Xie, Fan, Wang, Long, Yan, Zhong, Yan: "Leucine reduces reactive oxygen species levels via an energy metabolism switch by activation of the mTOR-HIF-1α pathway in porcine intestinal epithelial cells." in: The international journal of biochemistry & cell biology, Vol. 89, pp. 42-56, (2017) (PubMed).