Macromolecule Content

• Total Structure Weight: 8.43 kDa 
• Atom Count: 476 
• Modelled Residue Count: 57 
• Deposited Residue Count: 71 
• Unique protein chains: 1

2JQT

Structure of the bacterial replication origin-associated protein Cnu

• DOI: 10.2210/pdb2JQT/pdb

• Classification: PROTEIN BINDING
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2007-06-07 Released: 2008-04-22 
• Deposition Author(s): Bae, S.H., Liu, D., Lim, H.M., Lee, Y., Choi, B.S.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

Structure of the nucleoid-associated protein Cnu reveals common binding sites for H-NS in Cnu and Hha.

Bae, S.H., Liu, D., Lim, H.M., Lee, Y., Choi, B.S.

(2008) Biochemistry 47: 1993-2001

• PubMed: 18189420 
• DOI: 10.1021/bi701914t
• Primary Citation of Related Structures:  
  2JQT


• PubMed Abstract: 
  

Cnu is a nucleoid protein that has a high degree of sequence homology with Hha/YmoA family proteins, which bind to chromatin and regulate the expression of Escherichia coli virulence genes in response to changes in temperature or ionic strength. Here, we determined its solution structure and dynamic properties and mapped H-NS binding sites. Cnu consists of three alpha helices that are comparable with those of Hha, but it has significant flexibility in the C-terminal region and lacks a short alpha helix present in Hha. Upon increasing ionic strength, the helical structure of Cnu is destabilized, especially at the ends of the helices. The dominant H-NS binding sites, located at helix 3 as in Hha, reveal a common structural platform for H-NS binding. Our results may provide structural and dynamic bases for the similarity and dissimilarity between Cnu and Hha functions.

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Organizational Affiliation: 

Department of Chemistry, KAIST, 373-1 Guseong-Dong Yuseong-Gu, Daejeon 305-701, Republic of Korea.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
H-NS/stpA-binding protein 2	A	71	Escherichia coli	Mutation(s): 0  Gene Names: ydgT
Find proteins for P64467 (Escherichia coli (strain K12)) Explore P64467  Go to UniProtKB:  P64467

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2JQT Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-06-07 
• Released Date: 2008-04-22 
Deposition Author(s): Bae, S.H., Liu, D., Lim, H.M., Lee, Y., Choi, B.S.

Revision History  

• Version 1.0: 2008-04-22
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance