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The meiosis-specific recombinase hDmc1 forms ring structures and interacts with hRad51.

Masson, J. Y. and Davies, A. A. and Hajibagheri, N. and Van Dyck, E. and Benson, Fiona E. and Stasiak, A. Z. and Stasiak, A. and West, S. C. (1999) The meiosis-specific recombinase hDmc1 forms ring structures and interacts with hRad51. EMBO Journal, 18 (22). pp. 6552-6560. ISSN 0261-4189

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Abstract

Eukaryotic cells encode two homologs of Escherichia coli RecA protein, Rad51 and Dmc1, which are required for meiotic recombination. Rad51, like E.coli RecA, forms helical nucleoprotein filaments that promote joint molecule and heteroduplex DNA formation. Electron microscopy reveals that the human meiosis-specific recombinase Dmc1 forms ring structures that bind single-stranded (ss) and double-stranded (ds) DNA. The protein binds preferentially to ssDNA tails and gaps in duplex DNA. hDmc1–ssDNA complexes exhibit an irregular, often compacted structure, and promote strand-transfer reactions with homologous duplex DNA. hDmc1 binds duplex DNA with reduced affinity to form nucleoprotein complexes. In contrast to helical RecA/Rad51 filaments, however, Dmc1 filaments are composed of a linear array of stacked protein rings. Consistent with the requirement for two recombinases in meiotic recombination, hDmc1 interacts directly with hRad51.

Item Type: Article
Journal or Publication Title: EMBO Journal
Uncontrolled Keywords: hDmc1 ; hRad51 ; meiotic recombination ; recombinases ; ring structures
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Health and Medicine > Biomedical & Life Sciences
ID Code: 9055
Deposited By: Dr Fiona E Benson
Deposited On: 21 May 2008 16:22
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:31
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9055

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