Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 38.94 kDa 
• Atom Count: 2,441 
• Modelled Residue Count: 254 
• Deposited Residue Count: 300 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

 4UX5

Structure of DNA complex of PCG2

• PDB DOI: 10.2210/pdb4UX5/pdb
• NDB: NA3353

• Classification: TRANSCRIPTION
• Organism(s): Pyricularia oryzae, Candida albicans
• Mutation(s): No 


• Deposited: 2014-08-19 Released: 2015-01-14 
• Deposition Author(s): Liu, J., Huang, J., Zhao, Y., Liu, H., Wang, D., Yang, J., Zhao, W., Taylor, I.A., Peng, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.258 
• R-Value Work: 0.228 
• R-Value Observed: 0.231 

Literature

Structural Basis of DNA Recognition by Pcg2 Reveals a Novel DNA Binding Mode for Winged Helix-Turn-Helix Domains.

Liu, J., Huang, J., Zhao, Y., Liu, H., Wang, D., Yang, J., Zhao, W., Taylor, I.A., Peng, Y.

(2015) Nucleic Acids Res 43: 1231

• PubMed: 25550425 
• DOI: 10.1093/nar/gku1351
• Primary Citation of Related Structures:  
  4UX5


• PubMed Abstract: 
  

The MBP1 family proteins are the DNA binding subunits of MBF cell-cycle transcription factor complexes and contain an N terminal winged helix-turn-helix (wHTH) DNA binding domain (DBD). Although the DNA binding mechanism of MBP1 from Saccharomyces cerevisiae has been extensively studied, the structural framework and the DNA binding mode of other MBP1 family proteins remains to be disclosed. Here, we determined the crystal structure of the DBD of PCG2, the Magnaporthe oryzae orthologue of MBP1, bound to MCB-DNA. The structure revealed that the wing, the 20-loop, helix A and helix B in PCG2-DBD are important elements for DNA binding. Unlike previously characterized wHTH proteins, PCG2-DBD utilizes the wing and helix-B to bind the minor groove and the major groove of the MCB-DNA whilst the 20-loop and helix A interact non-specifically with DNA. Notably, two glutamines Q89 and Q82 within the wing were found to recognize the MCB core CGCG sequence through making hydrogen bond interactions. Further in vitro assays confirmed essential roles of Q89 and Q82 in the DNA binding. These data together indicate that the MBP1 homologue PCG2 employs an unusual mode of binding to target DNA and demonstrate the versatility of wHTH domains.

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Organizational Affiliation: 

MOA Key Laboratory of Plant Pathology, China Agricultural University, Beijing 100193, China State key Laboratory of Agrobiotechnology, China Agricultural University, Beijing 100193, China [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TRANSCRIPTION FACTOR MBP1	A, B	136	Pyricularia oryzae	Mutation(s): 0
UniProt
Find proteins for L7I1M8 (Magnaporthe oryzae (strain Y34)) Explore L7I1M8  Go to UniProtKB:  L7I1M8

Entity ID: 2
Molecule	Chains	Length	Organism	Image
5'-D(*CP*AP*AP*TP*GP*AP*CP*GP*CP*GP*TP*AP*AP*GP)-3'	C	14	Candida albicans

Entity ID: 3
Molecule	Chains	Length	Organism	Image
5'-D(*CP*TP*TP*AP*CP*GP*CP*GP*TP*CP*AP*TP*TP*GP)-3'	D	14	Candida albicans

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.258 
• R-Value Work: 0.228 
• R-Value Observed: 0.231 
• Space Group: P 4 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 117.36	α = 90
b = 117.36	β = 90
c = 65.89	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-01-14 
Deposition Author(s): Liu, J., Huang, J., Zhao, Y., Liu, H., Wang, D., Yang, J., Zhao, W., Taylor, I.A., Peng, Y.

Revision History  

• Version 1.0: 2015-01-14
  Type: Initial release
  
• Version 1.1: 2015-02-04
  Changes: Database references