6hm3
From Proteopedia
Crystal structure of Rad4 BRCT1,2 in complex with a Sld3 phosphopeptide
Structural highlights
Function[RAD4_SCHPO] Essential component for DNA replication and also the checkpoint control system which couples S and M phases. May directly or indirectly interact with chromatin proteins to form the complex required for the initiation and/or progression of DNA synthesis. [SLD3_SCHPO] Required for loading and maintenance of stable association of cdc45 with chromatin during initiation and elongation of DNA replication. Also involved in temporal regulation of origin firing. Plays a role in meiosis.[1] [2] Publication Abstract from PubMedTOPBP1 and its fission yeast homologueRad4, are critical players in a range of DNA replication, repair and damage signalling processes. They are composed of multiple BRCT domains, some of which bind phosphorylated motifs in other proteins. They thus act as multi-point adaptors bringing proteins together into functional combinations, dependent on post-translational modifications downstream of cell cycle and DNA damage signals. We have now structurally and/or biochemically characterised a sufficient number of high-affinity complexes for the conserved N-terminal region of TOPBP1 and Rad4 with diverse phospho-ligands, including human RAD9 and Treslin, and Schizosaccharomyces pombe Crb2 and Sld3, to define the determinants of BRCT domain specificity. We use this to identify and characterise previously unknown phosphorylation-dependent TOPBP1/Rad4-binding motifs in human RHNO1 and the fission yeast homologue of MDC1, Mdb1. These results provide important insights into how multiple BRCT domains within TOPBP1/Rad4 achieve selective and combinatorial binding of their multiple partner proteins. BRCT domains of the DNA damage checkpoint proteins TOPBP1/Rad4 display distinct specificities for phosphopeptide ligands.,Day M, Rappas M, Ptasinska K, Boos D, Oliver AW, Pearl LH Elife. 2018 Oct 8;7. pii: 39979. doi: 10.7554/eLife.39979. PMID:30295604[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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