Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 10.66 kDa 
• Atom Count: 660 
• Modelled Residue Count: 81 
• Deposited Residue Count: 90 
• Unique protein chains: 1

2KW0

Solution structure of N-terminal domain of CcmH from Escherichia.coli

• DOI: 10.2210/pdb2KW0/pdb
• BMRB: 16802

• Classification: OXIDOREDUCTASE
• Organism(s): Escherichia coli BL21
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-03-30 Released: 2011-07-13 
• Deposition Author(s): Hong, J., Zheng, X., Hu, H., Lin, D.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Biochemical properties and catalytic domain structure of the CcmH protein from Escherichia coli.

Zheng, X.M., Hong, J., Li, H.Y., Lin, D.H., Hu, H.Y.

(2012) Biochim Biophys Acta 1824: 1394-1400

• PubMed: 22789558 
• DOI: 10.1016/j.bbapap.2012.06.017
• Primary Citation of Related Structures:  
  2KW0


• PubMed Abstract: 
  

In the Gram-negative bacterium of Escherichia coli, eight genes organized as a ccm operon (ccmABCDEFGH) are involved in the maturation of c-type cytochromes. The proteins encoded by the last three genes ccmFGH are believed to form a lyase complex functioning in the reduction of apocytochrome c and haem attachment. Among them, CcmH is a membrane-associated protein; its N-terminus is a catalytic domain with the active CXXC motif and the C-terminus is predicted as a TPR-like domain with unknown function. By using SCAM (scanning cysteine accessibility mutagenesis) and Gaussia luciferase fusion assays, we provide experimental evidence for the entire topological structure of E. coli CcmH. The mature CcmH is a periplasm-resident oxidoreductase anchored to the inner membrane by two transmembrane segments. Both N- and C-terminal domains are located and function in the periplasmic compartment. Moreover, the N-terminal domain forms a monomer in solution, while the C-terminal domain is a compact fold with helical structures. The NMR solution structure of the catalytic domain in reduced form exhibits mainly a three-helix bundle, providing further information for the redox mechanism. The redox potential suggests that CcmH exhibits a strong reductase that may function in the last step of reduction of apocytochrome c for haem attachment.

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Organizational Affiliation: 

Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, China.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CcmH protein	A	90	Escherichia coli BL21	Mutation(s): 0  Gene Names: b2194, B21_02080, ccmH, JW2182, yejP
Find proteins for A0A140N7E0 (Escherichia coli (strain B / BL21-DE3)) Explore A0A140N7E0  Go to UniProtKB:  A0A140N7E0

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2KW0 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-03-30 
• Released Date: 2011-07-13 
Deposition Author(s): Hong, J., Zheng, X., Hu, H., Lin, D.

Revision History  

• Version 1.0: 2011-07-13
  Type: Initial release
  
• Version 1.1: 2012-11-07
  Changes: Database references
• Version 1.2: 2020-02-26
  Changes: Database references, Other