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Two reactions of bacteriophage-Qbeta RNA polymerase with synthetic templates were characterized and used to study the effects of substrate, metal and template on inhibition by Pi and PPi. Analysis of the poly(C)-dependent reaction yielded results on kinetics, GTP-dependence, preference for Mn2+ over Mg2+, and Michaelis constants for template similar to those in the literature. New data are provided for the poly(U2,C)-dependent reaction. Our results suggest that GTP and Mn2+ can form relatively stable complexes with the polymerase and that such complexes change the interaction of the enzyme with the inhibitors, Pi and PPi.

Substrate, metal and template effects on inhibition of bacteriophage-qβ ribonucleic acid polymerase by ortho- and pyro-phosphate