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Inhibition of the abortive initiation of transcription catalyzed by E. coli RNA polymerase has been studied here in the presence of bovine seminal plasmin. Seminal plasmin, which is known to be a stronger inhibitor than rifampicin binds at the same site as rifampicin to RNA polymerase. However, unlike rifampicin, seminal plasmin showed the inhibition of the formation of both the first and second phosphodiester...
The duplex DNA unwinding ability of seminal plasmin from bovine semen was examined by treatment of plasmid-protein complexes with calf thymus topoisomerase I and resolution of the topoisomer distributions by agarose gel electrophoresis. Binding of seminal plasmin results in a moderate degree of unwinding of supercoiled plasmid. The elongation of the RNA chain by E.coli RNA polymerase over promoter...
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