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- W1532445417 abstract "Two polyclonal antibodies were raised to synthetic peptides corresponding to amino acids Ser21-Tyr35 and Lys247-Phe261 of cytochrome b561. These antibodies were used to test the native orientation of the amino and carboxyl termini of this transmembrane electron transport protein. Carboxyl-terminal epitopes were lost when intact chromaffin granules were treated with Pronase. This result indicates that the carboxyl terminus is cytoplasmically exposed and confirms a theoretical prediction obtained from hydropathy plots. Epitopes that were recognized by an amino-terminal antipeptide antibody were not removed under the same conditions. This finding implied that the amino terminus was not proteolytically accessible on the exterior of the granule. The abundance of threonine and serine residues in the amino-terminal region suggested that the amino terminus could be held in the membrane by covalent fatty acylation. Treatment of purified delipidated cytochrome b561 with hydroxylamine resulted in the release of a fatty acid hydroxamate. Sulfhydryl analysis of purified cytochrome b561 showed that all 3 cysteine residues were in the free sulfhydryl form. These observations indicate that cytochrome b561 is covalently fatty acylated and that the lipid is bound through ester linkages of serine or threonine residues." @default.
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- W1532445417 date "1990-09-01" @default.
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- W1532445417 title "Cytochrome b561 is fatty acylated and oriented in the chromaffin granule membrane with its carboxyl terminus cytoplasmically exposed." @default.
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- W1532445417 doi "https://doi.org/10.1016/s0021-9258(17)46239-9" @default.
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