1QRQ

STRUCTURE OF A VOLTAGE-DEPENDENT K+ CHANNEL BETA SUBUNIT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of a voltage-dependent K+ channel beta subunit.

Gulbis, J.M.Mann, S.MacKinnon, R.

(1999) Cell 97: 943-952

  • Also Cited By: 3EB3, 3EB4, 3EAU

  • PubMed Abstract: 
  • The integral membrane subunits of many voltage-dependent potassium channels are associated with an additional protein known as the beta subunit. One function of beta subunits is to modify K+ channel gating. We have determined the structure of the con ...

    The integral membrane subunits of many voltage-dependent potassium channels are associated with an additional protein known as the beta subunit. One function of beta subunits is to modify K+ channel gating. We have determined the structure of the conserved core of mammalian beta subunits by X-ray crystallography at 2.8 A resolution. Like the integral membrane component of K+ channels, beta subunits form a four-fold symmetric structure. Each subunit is an oxidoreductase enzyme complete with a nicotinamide co-factor in its active site. Several structural features of the enzyme active site, including its location with respect to the four-fold axis, imply that it may interact directly or indirectly with the K+ channel's voltage sensor. This structure suggests a mechanism for coupling membrane electrical excitability directly to chemistry of the cell.


    Organizational Affiliation

    Laboratory of Molecular Neurobiology and Biophysics and the Howard Hughes Medical Institute, Rockefeller University, New York, New York 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (KV BETA2 PROTEIN)
A, B, C, D
325Rattus norvegicusMutation(s): 0 
Gene Names: Kcnab2 (Ckbeta2, Kcnb3)
EC: 1.1.1.-
Find proteins for P62483 (Rattus norvegicus)
Go to UniProtKB:  P62483
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP

Download SDF File 
Download CCD File 
A, B, C, D
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: 2.8 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.236 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 156.746α = 90.00
b = 114.346β = 90.00
c = 93.050γ = 90.00
Software Package:
Software NamePurpose
MLPHAREphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-10-27
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description