1SG7 | pdb_00001sg7

NMR solution structure of the putative cation transport regulator ChaB

• PDB DOI: https://doi.org/10.2210/pdb1SG7/pdb
• BMRB: 6117

• Classification: STRUCTURAL GENOMICS, UNKNOWN FUNCTION
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-02-23 Released: 2005-03-08 
• Deposition Author(s): Osborne, M.J., Siddiqui, N., Cygler, M., Gehring, K., Montreal-Kingston Bacterial Structural Genomics Initiative (BSGI)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 17 
• Selection Criteria: structures with the lowest energy 

Literature

The solution structure of ChaB, a putative membrane ion antiporter regulator from Escherichia coli

Osborne, M.J., Siddiqui, N., Iannuzzi, P., Gehring, K.

(2004) BMC Struct Biol 4: 9

• PubMed: 15306028 
• DOI: https://doi.org/10.1186/1472-6807-4-9
• Primary Citation Related Structures: 
  1SG7


• PubMed Abstract: 
  

  ChaB is a putative regulator of ChaA, a Na+/H+ antiporter that also has Ca+/H+ activity in E. coli. ChaB contains a conserved 60-residue region of unknown function found in other bacteria, archaeabacteria and a series of baculoviral proteins. As part of a structural genomics project, the structure of ChaB was elucidated by NMR spectroscopy. The structure of ChaB is composed of 3 alpha-helices and a small sheet that pack tightly to form a fold that is found in the cyclin-box family of proteins. ChaB is distinguished from its putative DNA binding sequence homologues by a highly charged flexible loop region that has weak affinity to Mg2+ and Ca2+ divalent metal ions.

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Organizational Affiliation: 
• Department of Biochemistry, McGill University, 3655 Promenade Sir William Osler, Montreal, Quebec, Canada, H3G 1Y6. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 11.19 kDa 
• Atom Count: 625 
• Modeled Residue Count: 75 
• Deposited Residue Count: 96 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Putative Cation transport regulator chaB	A	96	Escherichia coli	Mutation(s): 0  Gene Names: CHAB
UniProt
Find proteins for P0AE65 (Escherichia coli O157:H7) Explore P0AE65  Go to UniProtKB:  P0AE65

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 17 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2005-03-08 
Deposition Author(s): Osborne, M.J., Siddiqui, N., Cygler, M., Gehring, K., Montreal-Kingston Bacterial Structural Genomics Initiative (BSGI)

Revision History  

• Version 1.0: 2005-03-08
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-02
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2024-05-22
  Changes: Data collection