Biological Assembly 1  

 3D View: Structure

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Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 86387.26 
• Atom Count: 5892 
• Residue Count: 783 
• Unique protein chains: 1

3JA9

Structure of native human PCNA

• DOI: 10.2210/pdb3JA9/pdb
• EMDataBank: EMD-6339

• Classification: DNA BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2015-05-19 Released: 2015-12-09 
• Deposition Author(s): Lau, W.C.Y., Li, Y., Zhang, Q., Huen, M.S.Y.

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 22 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Molecular architecture of the Ub-PCNA/Pol eta complex bound to DNA

Lau, W.C., Li, Y., Zhang, Q., Huen, M.S.

(2015) Sci Rep 5: 15759-15759

• PubMed: 26503230 
• DOI: 10.1038/srep15759
• Primary Citation of Related Structures:  
  3JAA


• PubMed Abstract: 
  

Translesion synthesis (TLS) is the mechanism by which DNA polymerases replicate through unrepaired DNA lesions. TLS is activated by monoubiquitination of the homotrimeric proliferating cell nuclear antigen (PCNA) at lysine-164, followed by the switch from replicative to specialized polymerases at DNA damage sites. Pol η belongs to the Y-Family of specialized polymerases that can efficiently bypass UV-induced lesions. Like other members of the Y-Family polymerases, its recruitment to the damaged sites is mediated by the interaction with monoubiquitinated PCNA (Ub-PCNA) via its ubiquitin-binding domain and non-canonical PCNA-interacting motif in the C-terminal region. The structural determinants underlying the direct recognition of Ub-PCNA by Pol η, or Y-Family polymerases in general, remain largely unknown. Here we report a structure of the Ub-PCNA/Pol η complex bound to DNA determined by single-particle electron microscopy (EM). The overall obtained structure resembles that of the editing PCNA/PolB complex. Analysis of the map revealed the conformation of ubiquitin that binds the C-terminal domain of Pol η. Our present study suggests that the Ub-PCNA/Pol η interaction requires the formation of a structured binding interface, which is dictated by the inherent flexibility of Ub-PCNA.

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Organizational Affiliation: 

School of Biomedical Sciences, The University of Hong Kong, Hong Kong, China.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Proliferating cell nuclear antigen	A, B, C	261	Homo sapiens	Mutation(s): 0  Gene Names: PCNA
Find proteins for P12004 (Homo sapiens) Go to Gene View: PCNA Go to UniProtKB:  P12004

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 22 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-05-19 
• Released Date: 2015-12-09 
• Deposition Author(s): Lau, W.C.Y., Li, Y., Zhang, Q., Huen, M.S.Y.

Revision History 

• Version 1.0: 2015-12-09
  Type: Initial release
• Version 1.1: 2015-12-16
  Type: Other