A purified 15,000-molecular-weight (Mr) Prague strain Rous sarcoma virus gag gene-coded structural protein, p15, was shown to enzymatically cleave the previously described 130,000 Mr feline sarcoma virus-coded polyprotein, Pr130. Cleavage products included proteins ranging in molecular weight from 12,000 to 110,000. The specificity of this cleavage reactivity was indicated by the fact that, under similar conditions, neither purified type C viral structural proteins nor nonviral proteins such as bovine serum albumin were cleaved to significant extents. Moreover, feline leukemia virus Pr65gag was efficiently cleaved, resulting in the generations of proteins of 30,000 (p30), 15,000 (p15), 12,000 (p12), and 10,000 (p10) Mr. Using enzymatically (p15) treated feline sarcoma virus Pr130 as starting material, we were able to purify a major 72,000 Mr cleavage product and to show it to contain the previously described feline sarcoma virus-coded nonstructural component.
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