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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Cancedda, R. Schlesinger, M. J. |
| Abstract | Extracts from Krebs II ascites cells and rabbit reticulocytes effectively synthesize viral proteins with Sindbis viral mRNA isolated from Sindbis-infected BHK cells. The major product is identical to Sindbis capsid protein on the basis of its electrophoretic mobility in sodium dodecyl sulfate-acrylamide gels and two-dimensional tryptic-peptide fingerprints. Various amounts of several additional discrete polypeptides are formed, depending on the components of the cell-free extracts. One of these polypeptides may be a prematurely terminated part of the viral-capsid protein, while another is larger in molecular weight than capsid protein but contains the capsid tryptic peptides. Several of the proteins formed in vitro also are detected in extracts of Sindbis-infected BHK cells labeled with [(35)S]methionine. The three proteins found in Sindbis virions are postulated to originate by proteolytic cleavage from a larger molecular weight polypeptide precursor that is translated from a polycistronic mRNA presumed to contain a single site for initiation of protein synthesis. The two in vitro systems appear to translate this polycistronic viral mRNA to yield specific viral capsid although no evidence was found for post-translational proteolysis. Other mechanisms for production of the capsid protein in the cell-free extracts are considered, and some of these may function in the viral-infected cell where unusually large amounts of viral capsid proteins are frequently detected. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 71 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1974-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | RNA, Viral Sindbis Virus Subcellular Fractions Metabolism Viral Proteins Biosynthesis Animals Ascitic Fluid Cytology Cell Line Cell-Free System Cricetinae Electrophoresis, Polyacrylamide Gel Kidney Kinetics Methionine RNA, Messenger Rabbits Reticulocytes Sodium Dodecyl Sulfate Sulfur Radioisotopes Tritium Virus Cultivation Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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