Abstract
Insertion of rabbit cytochrome P450IIC2 and its modified form, [2-lys,3-arg]P450IIC2, into microsomal membranes was studied in an in vitro transcription/translation/translocation system. Cytochrome P450IIC2, synthesized in the presence of chicken oviduct microsomal membranes, was resistant to extraction by alkaline solutions, but was sensitive to proteolytic digestion. In contrast, when [2-lys,3-arg]-P450IIC2 was synthesized in the presence of membranes, two new species migrating more slowly during gel electrophoresis were observed. After treatment with endoglycosidase H, the more slowly migrating species comigrated with [2-lys,3-arg]P450IIC2 synthesized in the absence of membranes, indicating that the proteins had been glycosylated. Both the glycosylated and nonglycosylated forms of [2-lys,3-arg]P450IIC2 were resistant to proteolytic digestion and to extraction from the membranes by alkaline solutions. Similar results were obtained for a truncated species, [2-lys,3-arg]P450IIC2(1-55), except that only a single glycosylated species was observed, consistent with the single remaining glycosylation site. In contrast to the proteolytic processing observed previously in a hybrid [2-lys,3-arg]P450IIC2/parathyroid hormone protein, lit...Continue Reading
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