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J. Biol. Chem., Vol. 275, Issue 37, 29100-29106, September 15, 2000
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From the The Rad51 protein in eukaryotic cells is a
structural and functional homolog of Escherichia coli RecA
with a role in DNA repair and genetic recombination. Several proteins
showing sequence similarity to Rad51 have previously been identified in
both yeast and human cells. In Saccharomyces cerevisiae,
two of these proteins, Rad55p and Rad57p, form a heterodimer that can
stimulate Rad51-mediated DNA strand exchange. Here, we report the
purification of one of the representatives of the RAD51 family in human
cells. We demonstrate that the purified RAD51L3 protein possesses
single-stranded DNA binding activity and DNA-stimulated ATPase
activity, consistent with the presence of "Walker box" motifs in
the deduced RAD51L3 sequence. We have identified a protein complex in
human cells containing RAD51L3 and a second RAD51 family member, XRCC2.
By using purified proteins, we demonstrate that the interaction between RAD51L3 and XRCC2 is direct. Given the requirements for XRCC2 in
genetic recombination and protection against DNA-damaging agents, we
suggest that the complex of RAD51L3 and XRCC2 is likely to be important
for these functions in human cells.
Imperial Cancer Research Fund Laboratories,
Institute of Molecular Medicine, University of Oxford, John
Radcliffe Hospital, Oxford OX3 9DS and § Medical Research
Council Radiation and Genome Stability Unit, Harwell,
Oxfordshire OX11 ORD, United Kingdom
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