| Biosynthesis of nonspecific lipid transfer protein (sterol carrier protein 2) on free polyribosomes as a larger precursor in rat liver. | |
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MedLine Citation:
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PMID: 2628429 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The biosynthesis of nonspecific lipid transfer protein (nsLTP) was investigated. Total RNA of rat liver was translated in a rabbit reticulocyte lysate cell-free protein-synthesizing system with [35S]methionine as label. The immunoprecipitation of translation products with affinity-purified anti-nsLTP antibody yielded 14.5- and 60-kDa [35S]polypeptides. The molecular mass of the former polypeptide was approximately 1.5 kDa larger than that of the purified mature nsLTP (13 kDa). The site of synthesis of nsLTP was studied by in vitro translation of free and membrane-bound polyribosomal RNAs followed by immunoprecipitation. mRNA for both the 14.5- and 60-kDa polypeptides were found predominantly in the free polyribosomal fraction in both normal and clofibrate-treated rats. Clofibrate, a hypolipidemic drug that proliferates peroxisomes, did not increase the relative amount of nsLTP mRNA in rat liver. Pulse-chase experiments in rat hepatoma H-35 cells suggested that nsLTP was synthesized as a larger precursor of 14.5 kDa and converted to a mature form of 13 kDa. We have recently shown that nsLTP is highly concentrated in peroxisomes in rat hepatocytes [Tsuneoka et al. (1988) J. Biochem. 104, 560-564]. Taken together, these results suggest that nsLTP is synthesized as a larger precursor of 14.5 kDa on cytoplasmic free polyribosomes, then post-translationally transported to peroxisomes, where the precursor is presumably proteolytically processed to its mature form of 13 kDa. The relationship between the 13-kDa nsLTP and the 60-kDa polypeptide is also discussed. |
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Authors:
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Y Fujiki; M Tsuneoka; Y Tashiro |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of biochemistry Volume: 106 ISSN: 0021-924X ISO Abbreviation: J. Biochem. Publication Date: 1989 Dec |
Date Detail:
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Created Date: 1990-04-17 Completed Date: 1990-04-17 Revised Date: 2007-12-19 |
Medline Journal Info:
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Nlm Unique ID: 0376600 Medline TA: J Biochem Country: JAPAN |
Other Details:
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Languages: eng Pagination: 1126-31 Citation Subset: IM |
Affiliation:
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Laboratory of Molecular Cell Biology, Meiji Institute of Health Science, Kanagawa. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Carrier Proteins / biosynthesis* Catalase / metabolism Cell-Free System / metabolism Liver / enzymology, metabolism* Male Microbodies / metabolism Plant Proteins* Polyribosomes / metabolism* Protein Biosynthesis Protein Precursors / metabolism* RNA, Ribosomal / metabolism Rats Rats, Inbred F344 Rats, Inbred Strains |
| Chemical | |
Reg. No./Substance:
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0/Carrier Proteins; 0/Plant Proteins; 0/Protein Precursors; 0/RNA, Ribosomal; 0/sterol carrier proteins; EC 1.11.1.6/Catalase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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