In vitro biosynthesis and core glycosylation of the histidine-rich protein of Plasmodium lophurae |
| |
Authors: | R Feder G Blobel |
| |
Affiliation: | Laboratory of Cell Biology, The Rockefeller University, New York, NY 10021, U.S.A. |
| |
Abstract: | We have characterized the early biosynthetic forms of the histidine-rich protein (HisRP), a major, granule-bound protein (Mr 58 000) of the avian malarial parasite Plasmodium lophurae. We have translated poly(A)-containing, size-selected parasite mRNA in the wheat germ cell-free system in the presence of 3H]histidine. HisRP was synthesized as a larger precursor (Mr 63 000). When dog pancreas microsomal membranes were present in the cell-free system during translation, a still larger form of HisRP (Mr 66 000) was detected. This larger form was segregated into the dog pancreas microsomal vesicles and was core glycosylated. Presumably, it corresponds to an intermediate form located in the parasite rough endoplasmic reticulum (RER). The difference in the Mr of approx. 8 000 between this RER associated 'pro' form and the granule-bound, mature form of HisRP suggests that proteolytic processing occurs upon transport from the RER to the granule. Segregation and core glycosylation were strictly coupled to translation and were not observed upon posttranslational addition of microsomal membranes. Thus, the early events in the biosynthesis of HisRP are similar to those established for secretory and lysosomal proteins. |
| |
Keywords: | Cell-free translation Histidine-rich protein Preproprotein Segregation into microsomal vesicles BSA bovine serum albumin Con-A concanavalin A HisRP histidine-rich protein kDa kilodalton(s) PAGE polyacrylamide gel electrophoresis RBC red blood cell RER rough endoplasmic reticulum SDS sodium dodecyl sulfate |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|