Interaction of simian virus 40 small-T antigen produced in bacteria with 56K and 32K proteins of animal cells.

Small-t antigen produced in bacteria interacted with two animal cell proteins with molecular weights of 56,000 and 32,000, as did the viral antigen from infected cells. Demonstration of this specific interaction required the enrichment of native, monomeric small-t antigen from extracts in which much of the small-t antigen was highly aggregated.