Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 151260.67 
• Atom Count: 6701 
• Residue Count: 1420 
• Unique protein chains: 1

2ZD9

Structure of a Bacterial Cyclic-Nucleotide Regulated Ion Channel

• DOI: 10.2210/pdb2ZD9/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099)
• Expression System: Escherichia coli


• Deposited: 2007-11-21 Released: 2008-12-02 
• Deposition Author(s): Clayton, G.M., Cabral-Morais, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 4 Å
• R-Value Free: 0.333 
• R-Value Work: 0.307 

Literature

Structure of the transmembrane regions of a bacterial cyclic nucleotide-regulated channel.

Clayton, G.M., Altieri, S., Heginbotham, L., Unger, V.M., Morais-Cabral, J.H.

(2008) Proc.Natl.Acad.Sci.USA 105: 1511-1515

• PubMed: 18216238 
• DOI: 10.1073/pnas.0711533105
• Primary Citation of Related Structures:  
  3BEH


• PubMed Abstract: 
  

The six-transmembrane helix (6 TM) tetrameric cation channels form the largest ion channel family, some members of which are voltage-gated and others are not. There are no reported channel structures to match the wealth of functional data on the non-voltage-gated members. We determined the structure of the transmembrane regions of the bacterial cyclic nucleotide-regulated channel MlotiK1, a non-voltage-gated 6 TM channel. The structure showed how the S1-S4 domain and its associated linker can serve as a clamp to constrain the gate of the pore and possibly function in concert with ligand-binding domains to regulate the opening of the pore. The structure also led us to hypothesize a new mechanism by which motions of the S6 inner helices can gate the ion conduction pathway at a position along the pore closer to the selectivity filter than the canonical helix bundle crossing.

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Organizational Affiliation: 

Department of Molecular Biophysics and Biochemistry, Yale University, 260 Whitney Avenue, New Haven, CT 06520, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Mll3241 protein	A, B, C, D	355	Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099)	Mutation(s): 0
Find proteins for Q98GN8 (Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099)) Go to UniProtKB:  Q98GN8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
K	A, B, C	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 4 Å
• R-Value Free: 0.333 
• R-Value Work: 0.307 
• Space Group: H 3

Unit Cell:

Length (Å)	Angle (°)
a = 283.287	α = 90.00
b = 283.287	β = 90.00
c = 103.507	γ = 120.00

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-11-21 
• Released Date: 2008-12-02 
• Deposition Author(s): Clayton, G.M., Cabral-Morais, J.M.

Revision History 

• Version 1.0: 2008-12-02
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Version format compliance