1 McCready S J, Osman1 F, Yasui A. Repair of UV damage in the fission yeast Schizosaccharomyces pombe. Mutat Res, 2000, 451: 197–210？？
[2]
2 Sung P. Yeast Rad55 and Rad57 proteins form a heterodimer that functions with replication protein A to promote DNA strand exchange by Rad51 recombinase. Genes Dev, 1997, 11: 1111–1121？？
[3]
3 Mozlin A M, Fung C W, Symington L S. Role of the Saccharomyces cerevisiae Rad51 paralogs in sister chromatid recombination. Genetics,2008, 178: 113–126？？
[4]
4 Kawabata M, Kawabata T, Nishibori M. Role of recA/RAD51 family proteins in mammals. Acta Med Okayama, 2005, 59: 1–9
[5]
5 Thacker J. A surfeit of RAD51-like genes? Trends Genet, 1999, 15: 166–168？？
[6]
6 Miller K A, Sawicka D, Barsky D. Domain mapping of the Rad51 paralog protein complexes. Nucleic Acids Res, 2004, 32: 169–178？？
[7]
7 Takata M, Sasaki M S, Tachiiri S, et al. Chromosome instability and defective recombinational repair in knockout mutants of the five Rad51 paralogs. Mol Cell Biol, 2001, 21: 2858–2866？？
[8]
8 Kelman Z, White M F. Archaeal DNA replication and repair. Curr Opin Microbiol, 2005, 8: 669–676？？
[9]
9 Haldenby S, White M F, Allers T. RecA family proteins in archaea: RadA and its cousins. Biochem Soc Trans, 2009, 37: 102–107？？
[10]
10 Komori K, Miyata T, DiRuggiero J, et al. Both RadA and RadB are involved in homologous recombination in Pyrococcus furiosus. J Biol Chem, 2000, 275: 33782–33790？？
[11]
11 Guy C P, Haldenby S, Brindley A, et al. Interactions of RadB, a DNA repair protein in archaea, with DNA and ATP. J Mol Biol, 2006, 358:46–56？？
[12]
12 Sheng D, Zhu S, Wei T, et al. The in vitro activity of a Rad55 homologue from Sulfolobus tokodaii, a candidate mediator in RadA-catalyzed homologous recombination. Extremophiles, 2008, 12: 147–157？？
[13]
13 McRobbie A M, Carter L G, Kerou M, et al. Structural and functional characterisation of a conserved archaeal RadA paralog with antirecombinase activity. J Mol Biol, 2009, 389: 661–673？？
[14]
14 Abella M, Rodríguez S, Paytubi S, et al. The Sulfolobus solfataricus radA paralogue sso0777 is DNA damage inducible and positively regulated by the Sta1 protein. Nucleic Acids Res, 2007, 35: 6788–6797？？
[15]
15 Brock T D, Brock K M, Belly R T, et al. Sulfolobus: A new genus of sulfur-oxidizing bacteria living at low pH and high temperature. Arch Mikrobiol, 1972, 84: 54–68？？
[16]
16 Ausubel F M, Brent R, Kingston R E. Short Protocals in Molecular Biology 3rd, New York: Cold Spring Harbor Laboratory Press, 1995
[17]
17 Zhang S, Wei T, Hou G, et al. Archaeal DNA helicase HerA interacts with Mre11 homologue and unwinds blunt-ended double-stranded DNA and recombination intermediates. DNA Repair (Amst), 2008, 7: 380–391？？
[18]
18 Komori K, Sakae S, Fujikane R, et al. Biochemical characterization of the hjc holliday junction resolvase of Pyrococcus furiosus. Nucleic Acids Res, 2000, 28: 4544–4551？？
[19]
19 Kawarabayasi Y, Hino Y, Horikawa H, et al. Complete genome sequence of an aerobic thermoacidophilic crenarchaeon, Sulfolobus tokodaii strain7. DNA Res, 2001, 8: 123–140
[20]
20 Kvaratskhelia M, White M F. Two Holliday junction resolving enzymes in Sulfolobus solfataricus. J Mol Biol, 2000, 297: 923–932？？
22 Klein H L. The consequences of Rad51 overexpression for normal and tumor cells, DNA Repair (Amst), 2008, 7: 686–693？？
[23]
23 Venkatesh R, Ganesh N, Guhan N, et al. RecX protein abrogates ATP hydrolysis and strand exchange promoted by RecA: insights into negative regulation of homologous recombination. Proc Natl Acad Sci USA, 2002, 99: 12091–12096？？
[24]
24 Lusetti S L, Drees J C, Stohl E A, et al. The DinI and RecX proteins are competing modulators of RecA function. J Biol Chem, 2004, 279:55073–55079？？
[25]
25 Yoon D, Wang Y, Stapleford K, et al. P53 inhibits strand exchange and replication fork regression promoted by human Rad51. J Mol Biol,2004, 336: 639–654？？
[26]
26 Houtgraaf J H, Versmissen J, van der Giessen W J. A concise review of DNA damage checkpoints and repair in mammalian cells. Cardiovasc Revasc Med, 2006, 7: 165–172？？
