Abstract
Escherichia coli endonuclease IV is an archetype for an abasic or apurinic-apyrimidinic endonuclease superfamily crucial for DNA base excision repair. Here biochemical, mutational and crystallographic characterizations reveal a three–metal ion mechanism for damage binding and incision. The 1.10-Å resolution DNA-free and the 2.45-Å resolution DNA-substrate complex structures capture substrate stabilization by Arg37 and reveal a distorted Zn3-ligand arrangement that reverts, after catalysis, to an ideal geometry suitable to hold rather than release cleaved DNA product. The 1.45-Å resolution DNA-product complex structure shows how Tyr72 caps the active site, tunes its dielectric environment and promotes catalysis by Glu261-activated hydroxide, bound to two Zn2+ ions throughout catalysis. These structural, mutagenesis and biochemical results suggest general requirements for abasic site removal in contrast to features specific to the distinct endonuclease IV α-β triose phosphate isomerase (TIM) barrel and APE1 four-layer α-β folds of the apurinic-apyrimidinic endonuclease families.
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Acknowledgements
We thank J.A. Grasby, B.R. Chapados and R.S. Williams for insightful discussions and B. Yelent for aiding purifications. We thank the Stanford Synchrotron Radiation Laboratory, California, USA, for synchrotron facilities used in X-ray diffraction data collection. Work on DNA repair in the Tainer and Cunningham laboratories is supported by the US National Institutes of Health grants GM46312 (J.A.T. and R.P.C.) and CRR1C06RR0154464 (R.P.C.) and a Graduate Fellowship from the Skaggs Institute for Research (D.J.H.).
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E.D.G., M.B., R.P.C. and J.A.T. analyzed data and wrote the manuscript. D.J.H. designed and performed experiments, analyzed data and wrote the manuscript. S.A.D. and B.J.H. designed and performed experiments.
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Garcin, E., Hosfield, D., Desai, S. et al. DNA apurinic-apyrimidinic site binding and excision by endonuclease IV. Nat Struct Mol Biol 15, 515–522 (2008). https://doi.org/10.1038/nsmb.1414
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DOI: https://doi.org/10.1038/nsmb.1414
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