A sequence-specific DNA glycosylase mediates restriction-modification in Pyrococcus abyssi

Ken-ichi Miyazono, Yoshikazu Furuta, Miki Watanabe-Matsui, Takuya Miyakawa, Tomoko Ito, Ichizo Kobayashi and Masaru Tanokura ()
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Ken-ichi Miyazono: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Yoshikazu Furuta: Graduate School of Frontier Science, The University of Tokyo
Miki Watanabe-Matsui: Graduate School of Frontier Science, The University of Tokyo
Takuya Miyakawa: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Tomoko Ito: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Ichizo Kobayashi: Graduate School of Frontier Science, The University of Tokyo
Masaru Tanokura: Graduate School of Agricultural and Life Sciences, The University of Tokyo

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Restriction-modification systems consist of genes that encode a restriction enzyme and a cognate methyltransferase. Thus far, it was believed that restriction enzymes are sequence-specific endonucleases that introduce double-strand breaks at specific sites by catalysing the cleavages of phosphodiester bonds. Here we report that based on the crystal structure and enzymatic activity, one of the restriction enzymes, R.PabI, is not an endonuclease but a sequence-specific adenine DNA glycosylase. The structure of the R.PabI–DNA complex shows that R.PabI unwinds DNA at a 5′-GTAC-3′ site and flips the guanine and adenine bases out of the DNA helix to recognize the sequence. R.PabI catalyses the hydrolysis of the N-glycosidic bond between the adenine base and the sugar in the DNA and produces two opposing apurinic/apyrimidinic (AP) sites. The opposing AP sites are cleaved by heat-promoted β elimination and/or by endogenous AP endonucleases of host cells to introduce a double-strand break.

Date: 2014
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DOI: 10.1038/ncomms4178

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