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. 1982 Oct;2(10):1187–1198. doi: 10.1128/mcb.2.10.1187

Polyoma virus middle T antigen: relationship to cell membranes and apparent lack of ATP-binding activity.

B S Schaffhausen, H Dorai, G Arakere, T L Benjamin
PMCID: PMC369917  PMID: 6184609

Abstract

Middle T antigen of polyoma virus is associated principally with the plasma membrane. Comparison of the trypsin sensitivity of middle T in intact cells and "inside out" membrane preparations showed that middle T is oriented towards the inside of the cell. This was confirmed by labeling of middle T in permeabilized cells, but not in intact cells, using [gamma-32P]ATP. Middle T molecules active in the in vitro kinase reaction could be differentiated from the bulk (metabolically labeled) middle T based on resistance to trypsin treatment. The active fraction also behaved differently from the bulk when cell frameworks were prepared with Triton-containing buffers; whereas the bulk middle T was evenly distributed in the soluble and cell framework fractions, the kinase-active forms were largely associated with the framework. Middle T molecules labeled in vivo with 32PO4 were found largely in the framework fraction, like the molecules that show kinase activity in vitro. Experiments with ATP affinity reagents 8-azido-ATP and 2,3-dialdehyde ATP have failed to label the middle T antigen. However, 2,3-dialdehyde ATP could be used to inhibit the kinase reaction. This raises the question of whether middle T antigen possesses intrinsic kinase activity or, rather, associates with a cellular tyrosine kinase.

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Selected References

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