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Homologous pairing and ring and filament structure formation activities of the human Xrcc2*Rad51D complex.

Authors
  • Kurumizaka, Hitoshi
  • Ikawa, Shukuko
  • Nakada, Maki
  • Enomoto, Rima
  • Kagawa, Wataru
  • Kinebuchi, Takashi
  • Yamazoe, Mitsuyoshi
  • Yokoyama, Shigeyuki
  • Shibata, Takehiko
Type
Published Article
Journal
Journal of Biological Chemistry
Publisher
American Society for Biochemistry & Molecular Biology (ASBMB)
Publication Date
Apr 19, 2002
Volume
277
Issue
16
Pages
14315–14320
Identifiers
PMID: 11834724
Source
Medline
License
Unknown

Abstract

The Xrcc2 and Rad51D/Rad51L3 proteins, which belong to the Rad51 paralogs, are required for homologous recombinational repair (HRR) in vertebrates. The Xrcc2 and Rad51D/Rad51L3 genes, whose products interact with each other, have essential roles in ensuring normal embryonic development. In the present study, we coexpressed the human Xrcc2 and Rad51D/Rad51L3 proteins (Xrcc2 and Rad51D, respectively) in Escherichia coli, and purified the Xrcc2*Rad51D complex to homogeneity. The Xrcc2 small middle dotRad51D complex catalyzed homologous pairing between single-stranded and double-stranded DNA, similar to the function of the Xrcc3*Rad51C complex, which is another complex of the Rad51 paralogs. An electron microscopic analysis showed that Xrcc2*Rad51D formed a multimeric ring structure in the absence of DNA. In the presence of ssDNA, Xrcc2*Rad51D formed a filamentous structure, which is commonly observed among the human homologous pairing proteins, Rad51, Rad52, and Xrcc3*Rad51C.

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