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Rtt105 functions as a chaperone for replication protein A to preserve genome stability
Vise andre og tillknytning
2018 (engelsk)Inngår i: EMBO Journal, ISSN 0261-4189, E-ISSN 1460-2075, Vol. 37, nr 17, artikkel-id e99154Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Generation of single-stranded DNA (ssDNA) is required for the template strand formation during DNA replication. Replication Protein A (RPA) is an ssDNA-binding protein essential for protecting ssDNA at replication forks in eukaryotic cells. While significant progress has been made in characterizing the role of the RPA-ssDNA complex, how RPA is loaded at replication forks remains poorly explored. Here, we show that the Saccharomyces cerevisiae protein regulator of Ty1 transposition 105 (Rtt105) binds RPA and helps load it at replication forks. Cells lacking Rtt105 exhibit a dramatic reduction in RPA loading at replication forks, compromised DNA synthesis under replication stress, and increased genome instability. Mechanistically, we show that Rtt105 mediates the RPA-importin interaction and also promotes RPA binding to ssDNA directly in vitro, but is not present in the final RPA-ssDNA complex. Single-molecule studies reveal that Rtt105 affects the binding mode of RPA to ssDNA These results support a model in which Rtt105 functions as an RPA chaperone that escorts RPA to the nucleus and facilitates its loading onto ssDNA at replication forks.

sted, utgiver, år, opplag, sider
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 37, nr 17, artikkel-id e99154
Emneord [en]
RPA chaperone, Rtt105, replication fork, replication stress
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-150962DOI: 10.15252/embj.201899154ISI: 000443413000009PubMedID: 30065069OAI: oai:DiVA.org:umu-150962DiVA, id: diva2:1240364
Forskningsfinansiär
Swedish Research CouncilSwedish Cancer SocietyKnut and Alice Wallenberg FoundationTilgjengelig fra: 2018-08-21 Laget: 2018-08-21 Sist oppdatert: 2018-09-21bibliografisk kontrollert

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