Abstract
An NADH-cytochromeb5 reductase was purified from rat liver plasma membranes. Rat liver plasma membranes were prepared by aqueous two-phase partition. Peripheral proteins were removed by EDTA extraction and integral membrane proteins were solubilized with Triton X-100. The NADH-cytochromeb5 reductase was purified by hydroxyapatite, anion exchange, and gel filtration chromatographies. The purified preparation was homogeneous and estimated to have an apparent molecular weight of 32 kDa on SDS-polyacrylamide gel electrophoresis. Two tryptic peptides of the purified enzyme had sequence homologies with rat, human, and bovine NADH-cytochromeb5 reductases.
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