DNA polymerase V activity is autoregulated by a novel intrinsic DNA-dependent ATPase

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Abstract

Escherichia coli DNA polymerase V (pol V), a heterotrimeric complex composed of UmuD′2C, is marginally active. ATP and RecA play essential roles in the activation of pol V for DNA synthesis including translesion synthesis (TLS). We have established three features of the roles of ATP and RecA. 1) RecA-activated DNA polymerase V (pol V Mut), is a DNA-dependent ATPase; 2) bound ATP is required for DNA synthesis; 3) pol V Mut function is regulated by ATP, with ATP required to bind primer/template (p/t) DNA and ATP hydrolysis triggering dissociation from the DNA. Pol V Mut formed with an ATPase-deficient RecA E38K/K72R mutant hydrolyzes ATP rapidly, establishing the DNA-dependent ATPase as an intrinsic property of pol V Mut distinct from the ATP hydrolytic activity of RecA when bound to single-stranded (ss)DNA as a nucleoprotein filament (RecA*). No similar ATPase activity or autoregulatory mechanism has previously been found for a DNA polymerase.

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Aysen L Erdem

University of Southern California, Los Angeles, United States

Competing interests
The authors declare that no competing interests exist.
Malgorzata Jaszczur

University of Southern California, Los Angeles, United States

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The authors declare that no competing interests exist.
Jeffrey G Bertram

University of Southern California, Los Angeles, United States

Competing interests
The authors declare that no competing interests exist.
Roger Woodgate

National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, United States

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The authors declare that no competing interests exist.
Michael M Cox

University of Wisconsin-Madison, Madison, United States

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The authors declare that no competing interests exist.
Myron F Goodman

University of Southern California, Los Angeles, United States

For correspondence
mgoodman@usc.edu

Competing interests
The authors declare that no competing interests exist.

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