Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - ABC 

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

Macromolecule Content

• Total Structure Weight: 58743.57 
• Atom Count: 4113 
• Residue Count: 534 
• Unique protein chains: 3

1ZWI

Structure of mutant KcsA potassium channel

• DOI: 10.2210/pdb1ZWI/pdb

• Classification: IMMUNE SYSTEM/ION TRANSPORT
• Organism(s): Streptomyces lividans
• Expression System: Escherichia coli
• Mutation(s): 2 


• Deposited: 2005-06-03 Released: 2006-03-07 
• Deposition Author(s): Cordero-Morales, J.F., Cuello, L.G., Zhao, Y., Jogini, V., Cortes, D.M., Roux, B., Perozo, E.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.256 
• R-Value Work: 0.243 

Literature

Molecular determinants of gating at the potassium-channel selectivity filter.

Cordero-Morales, J.F., Cuello, L.G., Zhao, Y., Jogini, V., Cortes, D.M., Roux, B., Perozo, E.

(2006) Nat.Struct.Mol.Biol. 13: 311-318

• PubMed: 16532009 
• DOI: 10.1038/nsmb1069
• Primary Citation of Related Structures:  
  2ATK


• PubMed Abstract: 
  

We show that in the potassium channel KcsA, proton-dependent activation is followed by an inactivation process similar to C-type inactivation, and this process is suppressed by an E71A mutation in the pore helix. EPR spectroscopy demonstrates that the inner gate opens maximally at low pH regardless of the magnitude of the single-channel-open probability, implying that stationary gating originates mostly from rearrangements at the selectivity filter. Two E71A crystal structures obtained at 2.5 A reveal large structural excursions of the selectivity filter during ion conduction and provide a glimpse of the range of conformations available to this region of the channel during gating. These data establish a mechanistic basis for the role of the selectivity filter during channel activation and inactivation.

---

Organizational Affiliation: 

Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22906, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
monoclonal antibody, heavy chain	A	219	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
monoclonal antibody light chain	B	212	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Voltage-gated potassium channel	C	103	Streptomyces lividans	Mutation(s): 2  Gene Names: kcsA (skc1)
Find proteins for P0A334 (Streptomyces lividans) Go to UniProtKB:  P0A334

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
K	C	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N
DGA	C	DIACYL GLYCEROL C39 H76 O5 UHUSDOQQWJGJQS-QNGWXLTQSA-N
F09	A	NONAN-1-OL C9 H20 O ZWRUINPWMLAQRD-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.5 Å
• R-Value Free: 0.256 
• R-Value Work: 0.243 
• Space Group: I 4

Unit Cell:

Length (Å)	Angle (°)
a = 155.980	α = 90.00
b = 155.980	β = 90.00
c = 75.960	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
CNS	phasing
DENZO	data reduction
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-06-03 
• Released Date: 2006-03-07 
• Deposition Author(s): Cordero-Morales, J.F., Cuello, L.G., Zhao, Y., Jogini, V., Cortes, D.M., Roux, B., Perozo, E.

Revision History 

• Version 1.0: 2006-03-07
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2011-11-16
  Type: Atomic model