6j0x
Crystal Structure of Yeast Rtt107 and Mms22
Structural highlights
FunctionRT107_YEAST Required for resumption of chromosome replication after DNA damage, specifically in S phase. Is recruited to chromatin in the presence of RTT109 and RTT101 in response to stalled replication forks and acts as a scaffold during DNA repair.[1] [2] Publication Abstract from PubMedBRCT domains support myriad protein-protein interactions involved in genome maintenance. Although di-BRCT recognition of phospho-proteins is well known to support the genotoxic response, whether multi-BRCT domains can acquire distinct structures and functions is unclear. Here we present the tetra-BRCT structures from the conserved yeast protein Rtt107 in free and ligand-bound forms. The four BRCT repeats fold into a tetrahedral structure that recognizes unmodified ligands using a bi-partite mechanism, suggesting repeat origami enabling function acquisition. Functional studies show that Rtt107 binding of partner proteins of diverse activities promotes genome replication and stability in both distinct and concerted manners. A unified theme is that tetra- and di-BRCT domains of Rtt107 collaborate to recruit partner proteins to chromatin. Our work thus illustrates how a master regulator uses two types of BRCT domains to recognize distinct genome factors and direct them to chromatin for constitutive genome protection. Molecular Basis for Control of Diverse Genome Stability Factors by the Multi-BRCT Scaffold Rtt107.,Wan B, Wu J, Meng X, Lei M, Zhao X Mol Cell. 2019 Jul 25;75(2):238-251.e5. doi: 10.1016/j.molcel.2019.05.035. Epub, 2019 Jul 16. PMID:31348879[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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