Rous sarcoma virus transforming protein, p60src, expressed in E. coli, functions as a protein kinase View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1981-12

AUTHORS

Tona M. Gilmer, R. L. Erikson

ABSTRACT

The product of the Rous sarcoma virus (RSV) transforming gene, src, is a phosphoprotein of molecular weight (Mr) 60,000 (pp60src)1–3 that is responsible for cell transformation as well as fibrosarcoma formation in a variety of animals4,5. Several experiments suggest that pp60src is a protein kinase6–10 with the unusual capacity of phosphorylating tyrosine residues11,12, but additional evidence would be of value. Earlier studies had suggested that bacteria were unable to carry out protein phosphorylation13, although more recent findings indicate that distinct protein kinases and phosphatases are present in Salmonella typhimurium14. Despite this observation, because of the evolutionary distance, the enzymatic activities observed in bacteria are likely to be carried out by proteins unrelated to those expressed in eukaryotic cells. Thus, to study the RSV transforming protein synthesized in the absence of the variety of protein kinases expressed in normal host cells (for reviews see refs 15, 16), we have now constructed plasmids that express p60src in Escherichia coli. Analysis of p60src produced in E. coli and selected by immunoaffinity chromatography, shows that it has the capacity to phosphorylate proteins at tyrosine residues; this activity is specifically inhibited by anti-p60src IgG. Extracts from E. coli carrying identical plasmids but lacking the src gene yield no detectable enzyme activity. These data, taken with those previously published9,10,17, lead to the conclusion that the RSV src gene encodes a protein kinase. More... »

PAGES

771-773

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/294771a0

DOI

http://dx.doi.org/10.1038/294771a0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039289328

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/6172716


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