7NH9

structure of the full-length CmaX protein

• PDB DOI: https://doi.org/10.2210/pdb7NH9/pdb
• EM Map EMD-12321: EMDB EMDataResource

• Classification: TRANSPORT PROTEIN
• Organism(s): Pseudomonas aeruginosa PAO1
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMD


• Deposited: 2021-02-10 Released: 2021-07-07 
• Deposition Author(s): Stetsenko, A., Stehantsev, P., Guskov, A.
• Funding Organization(s): Netherlands Organisation for Scientific Research (NWO)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.03 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Structural and biochemical characterization of a novel ZntB (CmaX) transporter protein from Pseudomonas aeruginosa.

Stetsenko, A., Stehantsev, P., Dranenko, N.O., Gelfand, M.S., Guskov, A.

(2021) Int J Biol Macromol 184: 760-767

• PubMed: 34175341 
• DOI: https://doi.org/10.1016/j.ijbiomac.2021.06.130
• Primary Citation of Related Structures:  
  7NH9


• PubMed Abstract: 
  

  The 2-TM-GxN family of membrane proteins is widespread in prokaryotes and plays an important role in transport of divalent cations. The canonical signature motif, which is also a selectivity filter, has a composition of Gly-Met-Asn. Some members though deviate from this composition, however no data are available as to whether this has any functional implications. Here we report the functional and structural analysis of CmaX protein from a pathogenic Pseudomonas aeruginosa bacterium, which has a Gly-Ile-Asn signature motif. CmaX readily transports Zn ²⁺ , Mg ²⁺ , Cd ²⁺ , Ni ²⁺ and Co ²⁺ ions, but it does not utilize proton-symport as does ZntB from Escherichia coli. Together with the bioinformatics analysis, our data suggest that deviations from the canonical signature motif do not reveal any changes in substrate selectivity or transport and easily alter in course of evolution.

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Organizational Affiliation: 

Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, the Netherlands.

Biological Assembly 1  

Global Symmetry: Cyclic - C5  (Explore in 3D)
Global Stoichiometry: Homo 5-mer - A5 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 206.83 kDa 
• Atom Count: 13,120 
• Modelled Residue Count: 1,635 
• Deposited Residue Count: 1,830 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CmaX protein	A, B, C, D, E	366	Pseudomonas aeruginosa PAO1	Mutation(s): 0  Gene Names: cmaX, PA1773 Membrane Entity: Yes
UniProt
Find proteins for G3XD00 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore G3XD00  Go to UniProtKB:  G3XD00

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.03 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2021-07-07 
Deposition Author(s): Stetsenko, A., Stehantsev, P., Guskov, A.

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Funding Organization	Location	Grant Number
Netherlands Organisation for Scientific Research (NWO)		740.018.011

Revision History  

• Version 1.0: 2021-07-07
  Type: Initial release
  
• Version 1.1: 2021-07-14
  Changes: Database references
• Version 1.2: 2024-05-01
  Changes: Data collection, Database references