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• W4297103105 abstract "Abstract The TOPBP1 and NBS1 proteins are key components of DNA repair and DNA-based signaling systems. TOPBP1 is a multi-BRCT domain containing protein that plays important roles in checkpoint signaling, DNA replication, and DNA repair. Likewise, NBS1, which is a component of the MRE11-RAD50-NBS1 (MRN) complex, functions in both checkpoint signaling and DNA repair. NBS1 also contains BRCT domains, and previous works have shown that TOPBP1 and NBS1 interact with one another. In this work we examine the interaction between TOPBP1 and NBS1 in detail. We report that NBS1 uses its BRCT1 domain to interact with TOPBP1’s BRCT1 domain and, separately, with TOPBP1’s BRCT2 domain. Thus, NBS1 can make two distinct contacts with TOPBP1. We report that recombinant TOPBP1 and NBS1 proteins bind one another in a purified system, showing that the interaction is direct and does not require post-translational modifications. Surprisingly, we also report that intact BRCT domains are not required for these interactions, as truncated versions of the domains are sufficient to confer binding. For TOPBP1, we find that small 24-29 amino acid sequences within BRCT1 or BRCT2 allow binding to NBS1, in a transferrable manner. These data expand our knowledge of how the crucial DNA damage response proteins TOPBP1 and NBS1 interact with one another and set the stage for functional analysis of the two disparate binding sites for NBS1 on TOPBP1." @default.
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• W4297103105 date "2022-09-26" @default.
• W4297103105 modified "2023-09-27" @default.
• W4297103105 title "NBS1 binds directly to TOPBP1 via disparate interactions between the NBS1 BRCT1 domain and the TOPBP1 BRCT1 and BRCT2 domains" @default.
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• W4297103105 doi "https://doi.org/10.1101/2022.09.26.509489" @default.
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