7TUJ | pdb_00007tuj

NMR solution structure of the phosphorylated MUS81-binding region from human SLX4

• PDB DOI: https://doi.org/10.2210/pdb7TUJ/pdb
• BMRB: 30986

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2022-02-02 Released: 2022-10-19 
• Deposition Author(s): Payliss, B.J., Reichheld, S.E., Lemak, A., Arrowsmith, C.H., Sharpe, S., Wyatt, H.D.M.
• Funding Organization(s): Canadian Institutes of Health Research (CIHR)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Phosphorylation of the DNA repair scaffold SLX4 drives folding of the SAP domain and activation of the MUS81-EME1 endonuclease.

Payliss, B.J., Tse, Y.W.E., Reichheld, S.E., Lemak, A., Yun, H.Y., Houliston, S., Patel, A., Arrowsmith, C.H., Sharpe, S., Wyatt, H.D.M.

(2022) Cell Rep 41: 111537-111537

• PubMed: 36288699 
• DOI: https://doi.org/10.1016/j.celrep.2022.111537
• Primary Citation Related Structures: 
  7TUJ


• PubMed Abstract: 
  

  The DNA repair scaffold SLX4 has multifaceted roles in genome stability, many of which depend on structure-selective endonucleases. SLX4 coordinates the cell cycle-regulated assembly of SLX1, MUS81-EME1, and XPF-ERCC1 into a tri-nuclease complex called SMX. Mechanistically, how the mitotic kinase CDK1 regulates the interaction between SLX4 and MUS81-EME1 remains unclear. Here, we show that CDK1-cyclin B phosphorylates SLX4 residues T1544, T1561, and T1571 in the MUS81-binding region (SLX4 ^MBR ). Phosphorylated SLX4 ^MBR relaxes the substrate specificity of MUS81-EME1 and stimulates cleavage of replication and recombination structures, providing a biochemical explanation for the chromosome pulverization that occurs when SLX4 binds MUS81 in S-phase. Remarkably, phosphorylation of SLX4 ^MBR drives folding of an SAP domain, which underpins the high-affinity interaction with MUS81. We also report the structure of phosphorylated SLX4 ^MBR and identify the MUS81-binding interface. Our work provides mechanistic insights into how cell cycle-regulated phosphorylation of SLX4 drives the recruitment and activation of MUS81-EME1.

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Organizational Affiliation: 
• Department of Biochemistry, University of Toronto, Toronto, ON M56 1A8, Canada.
Molecular Medicine Program, Research Institute, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada.
Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada.
Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada; Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 2M9, Canada; Structural Genomics Consortium, Toronto, ON M5G 1L7, Canada.
Department of Biochemistry, University of Toronto, Toronto, ON M56 1A8, Canada; Molecular Medicine Program, Research Institute, The Hospital for Sick Children, Toronto, ON M5G 0A4, Canada.
Department of Biochemistry, University of Toronto, Toronto, ON M56 1A8, Canada; Canada Research Chairs Program, Temerty Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada. Electronic address: [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: NMR relaxation study

Macromolecule Content 

• Total Structure Weight: 9.96 kDa 
• Atom Count: 692 
• Modeled Residue Count: 86 
• Deposited Residue Count: 86 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Structure-specific endonuclease subunit SLX4	A	86	Homo sapiens	Mutation(s): 0  Gene Names: SLX4, BTBD12, KIAA1784, KIAA1987
UniProt & NIH Common Fund Data Resources
Find proteins for Q8IY92 (Homo sapiens) Explore Q8IY92  Go to UniProtKB:  Q8IY92
PHAROS:  Q8IY92 GTEx:  ENSG00000188827

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
TPO	A	L-PEPTIDE LINKING	C4 H10 N O6 P		THR

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2022-10-19 
Deposition Author(s): Payliss, B.J., Reichheld, S.E., Lemak, A., Arrowsmith, C.H., Sharpe, S., Wyatt, H.D.M.

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Funding Organization	Location	Grant Number
Canadian Institutes of Health Research (CIHR)	Canada	156297

Revision History  

• Version 1.0: 2022-10-19
  Type: Initial release
  
• Version 1.1: 2022-11-09
  Changes: Database references
• Version 1.2: 2024-11-13
  Changes: Data collection, Database references, Structure summary