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Multisubunit RNA polymerases melt only a single DNA base pair downstream of the active site. 2007
Ekaterina Kashkina, and
Michael Anikin, and
Florian Brueckner, and
Elisabeth Lehmann, and
Sergey N Kochetkov, and
William T McAllister, and
Patrick Cramer, and
Dmitry Temiakov
Department of Cell Biology, University of Medicine and Dentistry of New Jersey, School of Osteopathic Medicine, Stratford, NJ 08084, USA.
To extend the nascent transcript, RNA polymerases must melt the DNA duplex downstream from the active site to expose the next acceptor base for substrate binding and incorporation. A number of mechanisms have been proposed to account for the manner in which the correct substrate is selected, and these differ in their predictions as to how far the downstream DNA is melted. Using fluorescence quenching experiments, we provide evidence that cellular RNA polymerases from bacteria and yeast melt only one DNA base pair downstream from the active site. These data argue against a model in which multiple NTPs are lined up downstream of the active site.
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