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- W1664694609 abstract "A model has previously been proposed for the genetic relatedness of the structural proteins of polyoma virus, based upon similarities in the peptide maps of the major capsid protein VP1 with the virion proteins VP2 and VP3. Newer evidence suggests that this model is incorrect, and that protein VP1 is a product of one viral gene and that the multiple components of VP2 and VP3 are products of a second viral gene. Two-dimensional peptide maps of several preparations of polyoma purified separately from four separate infected-cell lysates has shown a variable content of VP1 peptides in proteins VP2 and VP3, with some preparations being free of detectable VP1 material in VP2 and VP3. An alternative explanation for the presence of VP1 peptides in the regions of VP2 and VP3 of some polyoma preparations involves the cleavage of proteins of polyoma virions during exposure to proteolytic enzymes in lysates of infected cells or to endogenous proteolytic activity of virions. Prolonged incubation of infected-cell lysates at 37 degrees C leads to an increase in the amount of 86,000-dalton dimer of VP1, a decrease in the relative amount of VP1, a decrease in or a loss of the lower band of VP2, and the appearance of a new major protein band of approximately 29,000 daltons. Two-dimensional peptide maps of the new 29,000-dalton protein show that it contains some VP1 peptides, indicating that this protein is derived from proteolytic cleavage of VP1. In addition, extensively purified polyoma virus contains a proteolytic activity that can be activated during disruption of the virus with 0.2 M Na2CO3-NaHCO3 (pH 10.6) in the presence of 5 X 10(-3) M dithiothreitol." @default.
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- W1664694609 title "Structural proteins of polyoma virus: proteolytic degradation of virion proteins by exogenous and by virion-associated proteases" @default.
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- W1664694609 doi "https://doi.org/10.1128/jvi.20.2.520-526.1976" @default.
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