Abstract
Products of the mitochondrial genome were identified in the bovine kidney cell line NBL-1 by labelling with [35S]methionine in the presence of cycloheximide. Seven proteins were precipitated by an antiserum to bovine heart NADH dehydrogenase, corresponding to the seven mitochondrial gene products identified in the human HeLa cell line. Comparison of these mitochondrial gene products with purified bovine NADH dehydrogenase by SDS/gel electrophoresis revealed that the ND-5 product is probably a previously unidentified protein of apparent Mr 51,000, and the ND-4 product is the protein of apparent Mr 39,000.