2N9E image
Entry Detail
PDB ID:
2N9E
Keywords:
Title:
Structure of SUMO-2 bound to phosphorylated RAP80 SIM
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2015-11-15
Release Date:
2016-01-20
Method Details:
Experimental Method:
Conformers Calculated:
20
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:BRCA1-A complex subunit RAP80
Chain IDs:A
Chain Length:15
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Small ubiquitin-related modifier 2
Chain IDs:B
Chain Length:95
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
SEP A SER PHOSPHOSERINE
Ligand Molecules
Primary Citation
Molecular Basis for Phosphorylation-dependent SUMO Recognition by the DNA Repair Protein RAP80.
J.Biol.Chem. 291 4417 4428 (2016)
PMID: 26719330 DOI: 10.1074/jbc.M115.705061

Abstact

Recognition and repair of double-stranded DNA breaks (DSB) involves the targeted recruitment of BRCA tumor suppressors to damage foci through binding of both ubiquitin (Ub) and the Ub-like modifier SUMO. RAP80 is a component of the BRCA1 A complex, and plays a key role in the recruitment process through the binding of Lys(63)-linked poly-Ub chains by tandem Ub interacting motifs (UIM). RAP80 also contains a SUMO interacting motif (SIM) just upstream of the tandem UIMs that has been shown to specifically bind the SUMO-2 isoform. The RAP80 tandem UIMs and SIM function collectively for optimal recruitment of BRCA1 to DSBs, although the molecular basis of this process is not well understood. Using NMR spectroscopy, we demonstrate that the RAP80 SIM binds SUMO-2, and that both specificity and affinity are enhanced through phosphorylation of the canonical CK2 site within the SIM. The affinity increase results from an enhancement of electrostatic interactions between the phosphoserines of RAP80 and the SIM recognition module within SUMO-2. The NMR structure of the SUMO-2·phospho-RAP80 complex reveals that the molecular basis for SUMO-2 specificity is due to isoform-specific sequence differences in electrostatic SIM recognition modules.

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Primary Citation of related structures