title: Biochemical studies on the muscle microsomes of Ascaris lumbricoides var. suum. II. Purification and characterization of b-type cytochrome and NADH-ferricyanide reductase from Ascaris muscle microsomes.
abstract: A b-type cytochrome and NADH-ferricyanide (FC) reductase were solubilized from Ascaris muscle microsomes by detergents and purified by column chromatography. The purified b-type cytochrome displayed absorption bands at 560 (alpha-peak), 525 (beta-peak), and 424 nm (gamma-peak), with a marked shoulder at 555 nm in the reduced from, 415 nm (gamma-peak) in the oxidized form. This absorption spectrum was different from that of rat liver microsomal cytochrome b5. The molecular weight was estimated to be about 100,000 by SDS-polyacrylamide gel electrophoresis, and the absorption spectrum of alkaline pyridine ferrohemochrome suggested that the prosthetic group of this cytochrome is protoheme. The molecular weight of the purified NADH-FC reductase was estimated to be about 55,000 by SDS-polyacrylamide gel electrophoresis. The purified reductase required NADH as a specific electron donor. The reductase efficiently reduced some redox dyes with NADH, but the reduction of cytochrome c was much slower. The purified reductase, like the membrane-bound reductase, was not inhibited by thiol reagents.
mesh_terms: D000818:Animals; D001200:Ascaris / Q000201:enzymology*; D003580:Cytochromes / Q000302:isolation & purification* / Q000378:metabolism; D004579:Electron Transport; D008861:Microsomes / Q000201:enzymology*; D008970:Molecular Weight; D009132:Muscles / Q000201:enzymology*; D009247:NADH, NADPH Oxidoreductases / Q000302:isolation & purification / Q000378:metabolism; D009249:NADP; D010084:Oxidation-Reduction; D013053:Spectrophotometry
chemical_list: D003580:Cytochromes; D009249:NADP; D009247:NADH, NADPH Oxidoreductases