3EAU

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1038/nchembio.114
  • Primary Citation of Related Structures:  3EB4, 3EB3

  • 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 ...

    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.


    Related Citations: 
    • Structure of a voltage-dependent K+ channel beta subunit.
      Gulbis, J.M.,Mann, S.,MacKinnon, R.
      (1999) Cell 97: 943
    • Structure of the cytoplasmic beta subunit-T1 assembly of voltage-dependent K+ channels.
      Gulbis, J.M.,Zhou, M.,Mann, S.,MacKinnon, R.
      (2000) Science 289: 123


    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Voltage-gated potassium channel subunit beta-2
A
327Rattus norvegicusGene Names: Kcnab2 (Ckbeta2, Kcnb3)
EC: 1.1.1.-
Find proteins for P62483 (Rattus norvegicus)
Go to UniProtKB:  P62483
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PDN
Query on PDN

Download SDF File 
Download CCD File 
A
17,21-DIHYDROXYPREGNA-1,4-DIENE-3,11,20-TRIONE
PREDNISONE; 1,4 PREGNADIENE-17ALPHA,21-DIOL-3,11,20-TRIONE; 1-CORTISONE; DEHYDROCORTISONE
C21 H26 O5
WZTZVUUYKIOIRV-LMZHSBCYSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
A
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.194 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 113.035α = 90.00
b = 113.035β = 90.00
c = 147.013γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
CNSrefinement
ADSCdata collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance