Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.69 kDa 
• Atom Count: 252 
• Residue Count: 33 
• Unique protein chains: 1

2MRF

NMR structure of the ubiquitin-binding zinc finger (UBZ) domain from human Rad18

• DOI: 10.2210/pdb2MRF/pdb
• BMRB: 25071

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


• Deposited: 2014-07-03 Released: 2014-10-01 
• Deposition Author(s): Rizzo, A.A., Salerno, P.E., Bezsonova, I., Korzhnev, D.M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 400 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

NMR Structure of the Human Rad18 Zinc Finger in Complex with Ubiquitin Defines a Class of UBZ Domains in Proteins Linked to the DNA Damage Response.

Rizzo, A.A., Salerno, P.E., Bezsonova, I., Korzhnev, D.M.

(2014) Biochemistry 53: 5895-5906

• PubMed: 25162118 
• DOI: 10.1021/bi500823h
• Primary Citation of Related Structures:  
  2MRF, 2MRE


• PubMed Abstract: 
  

Ubiquitin-mediated interactions are critical for the cellular DNA damage response (DDR). Therefore, many DDR-related proteins contain ubiquitin-binding domains, including ubiquitin-binding zinc fingers (UBZs). The majority of these UBZ domains belong to the C2H2 (type 3 Polη-like) or C2HC (type 4 Rad18-like) family. We have used nuclear magnetic resonance (NMR) spectroscopy to characterize the binding to ubiquitin and determine the structure of the type 4 UBZ domain (UBZ4) from human Rad18, which is a key ubiquitin ligase in the DNA damage tolerance pathway responsible for monoubiquitination of the DNA sliding clamp PCNA. The Rad18-UBZ domain binds ubiquitin with micromolar affinity and adopts a β1-β2-α fold similar to the previously characterized type 3 UBZ domain (UBZ3) from the translesion synthesis DNA polymerase Polη. However, despite nearly identical structures, a disparity in the location of binding-induced NMR chemical shift perturbations shows that the Rad18-UBZ4 and Polη-UBZ3 domains bind ubiquitin in distinctly different modes. The Rad18-UBZ4 domain interacts with ubiquitin with the α-helix and strand β1 as shown by the structure of the Rad18-UBZ domain-ubiquitin complex determined in this work, while the Polη-UBZ3 domain exclusively utilizes the α-helix. Our findings suggest the existence of two classes of UBZ domains in DDR-related proteins with similar structures but unique ubiquitin binding properties and provide context for further study to establish the differential roles of these domains in the complex cellular response to DNA damage.

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Organizational Affiliation: 

Department of Molecular Biology and Biophysics, University of Connecticut Health Center , Farmington, Connecticut 06030, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
E3 ubiquitin-protein ligase RAD18	A	33	Homo sapiens	Mutation(s): 0  Gene Names: RAD18, RNF73 EC: 6.3.2 (PDB Primary Data), 2.3.2.27 (UniProt)
Find proteins for Q9NS91 (Homo sapiens) Explore Q9NS91  Go to UniProtKB:  Q9NS91
NIH Common Fund Data Resources
PHAROS:  Q9NS91 GTEx:  ENSG00000070950

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 400 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2MRF Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-07-03 
• Released Date: 2014-10-01 
Deposition Author(s): Rizzo, A.A., Salerno, P.E., Bezsonova, I., Korzhnev, D.M.

Revision History 

• Version 1.0: 2014-10-01
  Type: Initial release
  
• Version 1.1: 2014-10-08
  Changes: Database references