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 
  • R-Value Observed: 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:  
    3EB3, 3EB4, 3EAU

  • 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 ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-gated potassium channel subunit beta-2 A327Rattus norvegicusMutation(s): 0 
Gene Names: Kcnab2Ckbeta2Kcnb3
EC: 1.1.1
Find proteins for P62483 (Rattus norvegicus)
Explore P62483 
Go to UniProtKB:  P62483
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP

Download Ideal Coordinates CCD File 
A
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
PDN
Query on PDN

Download Ideal Coordinates CCD File 
A
17,21-DIHYDROXYPREGNA-1,4-DIENE-3,11,20-TRIONE
C21 H26 O5
WZTZVUUYKIOIRV-LMZHSBCYSA-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 
  • 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
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

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