3FB5

KcsA potassium channel in the partially open state with 14.5 A opening at T112

• PDB DOI: https://doi.org/10.2210/pdb3FB5/pdb

• Classification: membrane protein/metal transport
• Organism(s): Mus musculus, Streptomyces lividans
• Expression System: Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2008-11-18 Released: 2010-05-19 
• Deposition Author(s): Cuello, L.G., Jogini, V., Cortes, D.M., Perozo, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.252 
• R-Value Work: 0.243 

Starting Model: experimental

Literature

KcsA potassium channel in the partially open state with 14.5 A opening at T112

Cuello, L.G., Jogini, V., Cortes, D.M., Perozo, E.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Hetero 12-mer - A4B4C4 

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

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 58.01 kDa 
• Atom Count: 3,957 
• Modelled Residue Count: 521 
• Deposited Residue Count: 535 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
antibody Fab fragment heavy chain	A	219	Mus musculus	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
antibody Fab fragment light chain	B	212	Mus musculus	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Voltage-gated potassium channel	C	104	Streptomyces lividans	Mutation(s): 7  Gene Names: kcsA, skc1 Membrane Entity: Yes
UniProt
Find proteins for P0A334 (Streptomyces lividans) Explore P0A334  Go to UniProtKB:  P0A334

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
K	D [auth C], E [auth C], F [auth C], G [auth C], H [auth C], I [auth C]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.252 
• R-Value Work: 0.243 
• Space Group: I 4

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 157.481	α = 90
b = 157.481	β = 90
c = 74.759	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-05-19 
Deposition Author(s): Cuello, L.G., Jogini, V., Cortes, D.M., Perozo, E.

Revision History  

• Version 1.0: 2010-05-19
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2021-10-20
  Changes: Database references, Derived calculations
• Version 1.3: 2023-09-06
  Changes: Data collection, Refinement description