title: The interaction of the membrane binding segment of cytochrome b5 with phospholipid vesicles. A pulse-radiolysis investigation.
abstract: The reactions of the radical anions Br2- and (SCN)2- produced by pulse-radiolysis have been used to study the interaction of dipalmitoyl phosphatidyl choline vesicles with the membrane binding segment (MBS) of cytochrome b5. Tryptophan oxidation by Br2- at neutral pH was characterized spectrophotometrically in detergent-solubilized solutions of MBS; the attack of tyrosine by (SCN)2- under alkaline conditions could also be observed directly. The incorporation of MBS into the lipid bilayer protected the tryptophan, tyrosine and methionine residues from oxidation by Br2- or (SCN)2-. Some structural implications of these results are discussed.
mesh_terms: D003580:Cytochromes; D015786:Cytochromes b5; D008081:Liposomes; D011663:Pulmonary Surfactants; D011675:Pulse Radiolysis
chemical_list: D003580:Cytochromes; D008081:Liposomes; D011663:Pulmonary Surfactants; D015786:Cytochromes b5