Purity > 90% as determined by SDS-PAGE. MW: 27.5kDa. Partial: 94-189aa. N-terminal 6xHis-SUMO-tagged. Homo sapiens (Human). Accessory subunit of the mitochondrial mbrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in 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.