Abstract
A previously described large-plaque morphology mutant of SV40 (SV-L) in primary African green monkey kidney (AGMK) cells has been shown to be restricted in the established AGMK line CV-1. The site of restriction is an early step in infection, involving the virus particle. A block in penetration or uncoating has been tentatively proposed. Restriction is observed in a number of other established lines, including monkey, human, and mouse. Independent large-plaque mutants were isolated in AGMK and their properties were compared with SV-L (temperature restriction, host restriction, and virion antigen). They can be separated into two classes. Both are restricted on CV-1, though to a lesser degree than SV-L. Further-more, both are coat mutants as determined by immunological analysis of their virions, suggesting a relationship between coat mutants associated with large-plaque morphology in AGMK and host restriction in established cell lines. Temperature restriction is seen with one but not the other of the mutants.
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