2A79

Mammalian Shaker Kv1.2 potassium channel- beta subunit complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history

Re-refinement Note

A newer entry is available that reflects an alternative modeling of the original data: 3LUT


Literature

Crystal structure of a mammalian voltage-dependent Shaker family K+ channel.

Long, S.B.Campbell, E.B.Mackinnon, R.

(2005) Science 309: 897-903

  • DOI: https://doi.org/10.1126/science.1116269
  • Primary Citation of Related Structures:  
    2A79

  • PubMed Abstract: 

    Voltage-dependent potassium ion (K+) channels (Kv channels) conduct K+ ions across the cell membrane in response to changes in the membrane voltage, thereby regulating neuronal excitability by modulating the shape and frequency of action potentials. Here we report the crystal structure, at a resolution of 2.9 angstroms, of a mammalian Kv channel, Kv1.2, which is a member of the Shaker K+ channel family. This structure is in complex with an oxido-reductase beta subunit of the kind that can regulate mammalian Kv channels in their native cell environment. The activation gate of the pore is open. Large side portals communicate between the pore and the cytoplasm. Electrostatic properties of the side portals and positions of the T1 domain and beta subunit are consistent with electrophysiological studies of inactivation gating and with the possibility of K+ channel regulation by the beta subunit.


  • Organizational Affiliation

    Howard Hughes Medical Institute, Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Voltage-gated potassium channel beta-2 subunit333Rattus norvegicusMutation(s): 0 
Gene Names: Kcnab2Ckbeta2Kcnb3
Membrane Entity: Yes 
UniProt
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
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Potassium voltage-gated channel subfamily A member 2499Rattus norvegicusMutation(s): 0 
Gene Names: Kcna2
Membrane Entity: Yes 
UniProt
Find proteins for P63142 (Rattus norvegicus)
Explore P63142 
Go to UniProtKB:  P63142
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63142
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
poly-unknown chain52Rattus norvegicusMutation(s): 0 
Gene Names: Kcna2
Sequence Annotations
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  • Reference Sequence

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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
poly-unknown chain21Rattus norvegicusMutation(s): 0 
Gene Names: Kcna2
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAP
Query on NAP

Download Ideal Coordinates CCD File 
E [auth A]NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
K
Query on K

Download Ideal Coordinates CCD File 
F [auth B]
G [auth B]
H [auth B]
I [auth B]
J [auth B]
F [auth B],
G [auth B],
H [auth B],
I [auth B],
J [auth B],
K [auth B]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.605α = 90
b = 113.605β = 90
c = 260.473γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-07-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description