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Electron microscopy and 3D reconstructions reveal that human ATM kinase uses an arm-like domain to clamp around double-stranded DNA

Abstract

The human tumor suppressor gene ataxia telangiectasia mutated (ATM) encodes a 3056 amino-acid protein kinase that regulates cell cycle checkpoints. ATM is defective in the neurodegenerative and cancer predisposition syndrome ataxia-telangiectasia. ATM protein kinase is activated by DNA damage and responds by phosphorylating downstream effectors involved in cell cycle arrest and DNA repair, such as p53, MDM2, CHEK2, BRCA1 and H2AX. ATM is probably a component of, or in close proximity to, the double-stranded DNA break-sensing machinery. We have observed purified human ATM protein, ATM–DNA and ATM–DNA–avidin bound complexes by single-particle electron microscopy and obtained three-dimensional reconstructions which show that ATM is composed of two main domains comprising a head and an arm. DNA binding to ATM induces a large conformational movement of the arm-like domain. Taken together, these three structures suggest that ATM is capable of interacting with DNA, using its arm to clamp around the double helix.

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Acknowledgements

ATM purified protein was kindly provided by Timothy J Lansing from the Oncology Biology Department, GlaxoSmithkline Research and Development, 5 Moore Drive, Research Triangle Park, NC 27709, USA. From the Institute of Cancer Research, we thank David Robertson, for his help in the initial stages of this work, and the Department of Structural Biology for the use of their computer facilities. We thank Marin van Heel of the Electron Microscopy Unit at Imperial College, London, for use of their microscopes, and John Barber and John Nield of Imperial College for the use of their Leafscan45 scanner (Leaf Systems Inc.). The valuable help of Frank Booy in the use of the electron microscopes at Imperial College is specially acknowledged. Finally, we thank Chris Marshall, David Barford (ICR) and Jasminka Boskovic (CSIC) for careful reading of the manuscript.

This work has been supported by Cancer Research, UK. Oscar Llorca was a Marie Curie Fellow from European Union (Contract number HPMF-CT-2000-00563) at the Institute of Cancer Research till June 2002. OL has also been partially supported by project SAF2002-01715 from the ‘Ministerio de Ciencia y Tecnologia’ of Spain.

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Correspondence to K R Willison.

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Llorca, O., Rivera-Calzada, A., Grantham, J. et al. Electron microscopy and 3D reconstructions reveal that human ATM kinase uses an arm-like domain to clamp around double-stranded DNA. Oncogene 22, 3867–3874 (2003). https://doi.org/10.1038/sj.onc.1206649

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