{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T06:38:36Z","timestamp":1779345516919,"version":"3.51.4"},"reference-count":108,"publisher":"Proceedings of the National Academy of Sciences","issue":"15","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2001,7,17]]},"abstract":"<jats:p>\n            Members of the RecA family of recombinases from bacteriophage T4,\n            <jats:italic>Escherichia coli<\/jats:italic>\n            , yeast, and higher eukaryotes function in recombination as higher-order oligomers assembled on tracts of single-strand DNA (ssDNA). Biochemical studies have shown that assembly of recombinase involves accessory factors. These studies have identified a class of proteins, called recombination mediator proteins, that act by promoting assembly of recombinase on ssDNA tracts that are bound by ssDNA-binding protein (ssb). In the absence of mediators, ssb inhibits recombination reactions by competing with recombinase for DNA-binding sites. Here we briefly review mediated recombinase assembly and present results of new\n            <jats:italic>in vivo<\/jats:italic>\n            experiments. Immuno-double-staining experiments in\n            <jats:italic>Saccharomyces cerevisiae<\/jats:italic>\n            suggest that Rad51, the eukaryotic recombinase, can assemble at or near sites containing ssb (replication protein A, RPA) during the response to DNA damage, consistent with a need for mediator activity. Correspondingly, mediator gene mutants display defects in Rad51 assembly after DNA damage and during meiosis, although the requirements for assembly are distinct in the two cases. In meiosis, both Rad52 and Rad55\/57 are required, whereas either Rad52 or Rad55\/57 is sufficient to promote assembly of Rad51 in irradiated mitotic cells. Rad52 promotes normal amounts of Rad51 assembly in the absence of Rad55 at 30\u00b0C but not 20\u00b0C, accounting for the cold sensitivity of\n            <jats:italic>rad55<\/jats:italic>\n            null mutants. Finally, we show that assembly of Rad51 is induced by radiation during S phase but not during G\n            <jats:sub>1<\/jats:sub>\n            , consistent with the role of Rad51 in repairing the spontaneous damage that occurs during DNA replication.\n          <\/jats:p>","DOI":"10.1073\/pnas.121046198","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T14:34:10Z","timestamp":1027694050000},"page":"8411-8418","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":123,"title":["Assembly of RecA-like recombinases: Distinct roles for mediator proteins in mitosis and meiosis"],"prefix":"10.1073","volume":"98","author":[{"given":"Stephen L.","family":"Gasior","sequence":"first","affiliation":[{"name":"Departments of Radiation and Cellular Oncology, and Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Heidi","family":"Olivares","sequence":"additional","affiliation":[{"name":"Departments of Radiation and Cellular Oncology, and Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Uy","family":"Ear","sequence":"additional","affiliation":[{"name":"Departments of Radiation and Cellular Oncology, and Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Danielle M.","family":"Hari","sequence":"additional","affiliation":[{"name":"Departments of Radiation and Cellular Oncology, and Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ralph","family":"Weichselbaum","sequence":"additional","affiliation":[{"name":"Departments of Radiation and Cellular Oncology, and Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Douglas K.","family":"Bishop","sequence":"additional","affiliation":[{"name":"Departments of Radiation and Cellular Oncology, and Molecular Genetics and Cell Biology, University of Chicago, Chicago, IL 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"341","published-online":{"date-parts":[[2001,7,17]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1038\/309215a0"},{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF01924002"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9258(18)89290-0"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/0092-8674(95)90434-4"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.8456314"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1128\/MMBR.63.4.751-813.1999"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1128\/MMBR.63.2.349-404.1999"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1128\/mr.58.3.401-465.1994"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1101\/SQB.1981.045.01.052"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0079-6603(08)61005-3"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0027-5107(00)00054-3"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1093\/genetics\/138.2.241"},{"key":"e_1_3_3_13_2","first-page":"520","volume-title":"Molecular Biology of Bacteriophage T4","author":"Cowan J","year":"1994","unstructured":"J Cowan, K D'Acci, B Guttman, E Kutter Molecular Biology of Bacteriophage T4, ed J D Karam (Am. 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