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- W1570725059 abstract "Abstract Preparations of the cowpea strain of TMV contain both large and small particles. RNA extracted from these particles has been translated in a cell-free protein synthesizing system derived from wheat germ. The polypeptide products have been characterized by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), by immunoprecipitation followed by SDS-PAGE and also by two-dimensional tryptic peptide mapping of the immunoprecipitated material. Coat-protein was shown to be a major product of in vitro protein synthesis directed by total viral RNA. It was synthesized in a form slightly larger than the long polypeptide of the virus capsid as judged by peptide mapping and incorporation of [35S]methionine, an amino acid not present in B-TMV coat-protein. RNA extracted from a purified preparation of short particles stimulated the wheat-germ system to synthesize coat-protein almost exclusively. It was concluded that short particles carry a cistron for coat-protein. RNA isolated from a preparation of long particles programmed the synthesis of a series of polypeptides ranging in size from 130,000 to 5000 daltons, and including some coat-protein. More extensive purification of the high molecular weight RNA showed that the synthesis of coat-protein was not attributable to this RNA but to residual low molecular weight RNA from short particles. Thus RNA from long particles resembles RNA from Ul-TMV in its inability to program a wheat-germ system to synthesize appreciable amounts of coat-protein. Evidence is given elsewhere that long particle RNA actually contains a cistron for coat-protein. Translation of long RNA could be suppressed by the addition of short RNA to the in vitro system, resulting in a polypeptide profile dominated by coat-protein. Initiation sites in the coat-protein cistron on the short RNA must therefore be preferentially recognized by the wheat-germ protein synthesizing system." @default.
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- W1570725059 date "1976-06-01" @default.
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- W1570725059 title "Occurrence of short particles in beans infected with the cowpea strain of TMV" @default.
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- W1570725059 doi "https://doi.org/10.1016/0042-6822(76)90376-7" @default.
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