Nucleic Acids Research Advance Access originally published online on June 19, 2008
Nucleic Acids Research 2008 36(12):4181-4190; doi:10.1093/nar/gkn362
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Nucleic Acids Research, 2008, Vol. 36, No. 12 4181-4190
© 2008 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Molecular Biology |
Structural and functional analyses of the DMC1-M200V polymorphism found in the human population
1Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, 2Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, 3RIKEN Advanced Research Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, 4RIKEN Systems and Structural Biology Center, 1-7-22 Suehiro-cho, Tsurumi, Yokohama-shi, Kanagawa 230-0045, 5Institute for Biomedical Engineering, Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, 6Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, 7INRA, UMR1198; ENVA; CNRS; FRE 2857, Biologie du Developpement et Reproduction, Jouy-en-Josas, F-78350 and 8Institut Curie, Centre de Recherche, UMR7147- Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, 26 rue dUlm, 75248 Paris Cedex 05, France
*To whom correspondence should be addressed. Tel: +81 3 5369 7315; Fax: +81 3 5367 2820; Email: kurumizaka{at}waseda.jp
Correspondence may also be addressed to Kunihiro Ohta. Tel: +81 3 5464 8834; Fax: +81 3 5464 8834; Email: kohta{at}bio.c.u-tokyo.ac.jp
Received April 18, 2008. Revised May 18, 2008. Accepted May 21, 2008.
The M200V polymorphism of the human DMC1 protein, which is an essential, meiosis-specific DNA recombinase, was found in an infertile patient, raising the question of whether this homozygous human DMC1-M200V polymorphism may cause infertility by affecting the function of the human DMC1 protein. In the present study, we determined the crystal structure of the human DMC1-M200V variant in the octameric-ring form. Biochemical analyses revealed that the human DMC1-M200V variant had reduced stability, and was moderately defective in catalyzing in vitro recombination reactions. The corresponding M194V mutation introduced in the Schizosaccharomyces pombe dmc1 gene caused a significant decrease in the meiotic homologous recombination frequency. Together, these structural, biochemical and genetic results provide extensive evidence that the human DMC1-M200V mutation impairs its function, supporting the previous interpretation that this single-nucleotide polymorphism is a source of human infertility.
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