Abstract

An improved method for the reconstitution of DNA-dependent RNA polymerase from its isolated subunits in the absence of urea is described. It allows the kinetic analysis of the assembly mechanism. The rate of reconstitution as well as the final yield are strongly temperature-dependent, whereas concentration has only a small effect. The kinetics of the formation of an intermediary complex α2β and an inactive enzyme complex α2ββ′σ were followed. The rate-limiting and temperature-sensitive step during reconstitution is the conversion of the inactive complex α2ββ′σ into active enzyme.

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