Voltage-dependent K+ channel beta subunit in complex with cortisone

Experimental Data Snapshot

  • Resolution: 1.82 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Cortisone dissociates the Shaker family K+ channels from their beta subunits.

Pan, Y.Weng, J.Kabaleeswaran, V.Li, H.Cao, Y.Bhosle, R.C.Zhou, M.

(2008) Nat Chem Biol 4: 708-714

  • DOI: https://doi.org/10.1038/nchembio.114
  • Primary Citation of Related Structures:  
    3EAU, 3EB3, 3EB4

  • PubMed Abstract: 

    The Shaker family voltage-dependent potassium channels (Kv1) are expressed in a wide variety of cells and are essential for cellular excitability. In humans, loss-of-function mutations of Kv1 channels lead to hyperexcitability and are directly linked to episodic ataxia and atrial fibrillation. All Kv1 channels assemble with beta subunits (Kv betas), and certain Kv betas, for example Kv beta 1, have an N-terminal segment that closes the channel by the N-type inactivation mechanism. In principle, dissociation of Kv beta 1, although never reported, should eliminate inactivation and thus potentiate Kv1 current. We found that cortisone increases rat Kv1 channel activity by binding to Kv beta 1. A crystal structure of the Kv beta-cortisone complex was solved to 1.82-A resolution and revealed novel cortisone binding sites. Further studies demonstrated that cortisone promotes dissociation of Kv beta. The new mode of channel modulation may be explored by native or synthetic ligands to fine-tune cellular excitability.

  • Organizational Affiliation

    Department of Physiology and Cellular Biophysics, Columbia University College of Physicians and Surgeons, 630 West 168th Street, New York, New York 10032, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Voltage-gated potassium channel subunit beta-2327Rattus norvegicusMutation(s): 0 
Gene Names: Kcnab2Ckbeta2Kcnb3
EC: 1.1.1
Find proteins for P62483 (Rattus norvegicus)
Explore P62483 
Go to UniProtKB:  P62483
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62483
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NDP

Download Ideal Coordinates CCD File 
C21 H30 N7 O17 P3
Query on PDN

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
C21 H26 O5
Experimental Data & Validation

Experimental Data

  • Resolution: 1.82 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.035α = 90
b = 113.035β = 90
c = 147.013γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-08-30
    Changes: Data collection, Database references, Derived calculations, Refinement description