4BMC image
Entry Detail
PDB ID:
4BMC
Keywords:
Title:
Crystal structure of s.pombe Rad4 BRCT1,2
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-05-07
Release Date:
2013-10-09
Method Details:
Experimental Method:
Resolution:
1.98 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:S-M CHECKPOINT CONTROL PROTEIN RAD4
Chain IDs:A
Chain Length:186
Number of Molecules:1
Biological Source:SCHIZOSACCHAROMYCES POMBE
Ligand Molecules
Primary Citation
Phosphorylation-Dependent Assembly and Coordination of the DNA Damage Checkpoint Apparatus by Rad4(Topbp1.).
Mol.Cell 51 723 ? (2013)
PMID: 24074952 DOI: 10.1016/J.MOLCEL.2013.08.030

Abstact

The BRCT-domain protein Rad4(TopBP1) facilitates activation of the DNA damage checkpoint in Schizosaccharomyces pombe by physically coupling the Rad9-Rad1-Hus1 clamp, the Rad3(ATR) -Rad26(ATRIP) kinase complex, and the Crb2(53BP1) mediator. We have now determined crystal structures of the BRCT repeats of Rad4(TopBP1), revealing a distinctive domain architecture, and characterized their phosphorylation-dependent interactions with Rad9 and Crb2(53BP1). We identify a cluster of phosphorylation sites in the N-terminal region of Crb2(53BP1) that mediate interaction with Rad4(TopBP1) and reveal a hierarchical phosphorylation mechanism in which phosphorylation of Crb2(53BP1) residues Thr215 and Thr235 promotes phosphorylation of the noncanonical Thr187 site by scaffolding cyclin-dependent kinase (CDK) recruitment. Finally, we show that the simultaneous interaction of a single Rad4(TopBP1) molecule with both Thr187 phosphorylation sites in a Crb2(53BP1) dimer is essential for establishing the DNA damage checkpoint.

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Primary Citation of related structures