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Polymerization of RNA from a template DNA is carried out by a molecularmachine called RNA polymerase (RNAP). It also uses the template as a track onwhich it moves as a motor utilizing chemical energy input. The time it spendsat each successive monomer of DNA is random; we derive the exact distributionof these "dwell times" in our model. The inverse of the mean dwell timesatisfies a Michaelis-Menten-like equation and is also consistent with ageneral formula derived earlier by Fisher and Kolomeisky for molecular motorswith unbranched mechano-chemical cycles. Often many RNAP motors movesimultaneously on the same track. Incorporating the steric interactions amongthe RNAPs in our model, we also plot the three-dimensional phase diagram of ourmodel for RNAP traffic using an extremum current hypothesis.

RNA polymerase motors: dwell time distribution, velocity and dynamical phases