1EXB

STRUCTURE OF THE CYTOPLASMIC BETA SUBUNIT-T1 ASSEMBLY OF VOLTAGE-DEPENDENT K CHANNELS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 

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This is version 1.4 of the entry. See complete history. 


Literature

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: 123-127

  • DOI: https://doi.org/10.1126/science.289.5476.123
  • Primary Citation of Related Structures:  
    1EXB

  • PubMed Abstract: 

    The structure of the cytoplasmic assembly of voltage-dependent K+ channels was solved by x-ray crystallography at 2.1 angstrom resolution. The assembly includes the cytoplasmic (T1) domain of the integral membrane alpha subunit together with the oxidoreductase beta subunit in a fourfold symmetric T1(4)beta4 complex. An electrophysiological assay showed that this complex is oriented with four T1 domains facing the transmembrane pore and four beta subunits facing the cytoplasm. The transmembrane pore communicates with the cytoplasm through lateral, negatively charged openings above the T1(4)beta4 complex. The inactivation peptides of voltage-dependent K(+) channels reach their site of action by entering these openings.

    • Organizational Affiliation: 

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


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
KV BETA2 PROTEIN332Rattus norvegicusMutation(s): 0 
EC: 1.1.1
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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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
POTASSIUM CHANNEL KV1.1B [auth E]103Rattus norvegicusMutation(s): 0 
UniProt
Find proteins for P10499 (Rattus norvegicus)
Explore P10499 
Go to UniProtKB:  P10499
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10499
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP
Download Ideal Coordinates CCD File 
C [auth A]NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.725α = 90
b = 100.725β = 90
c = 110.901γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-07-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-07-21
    Changes: Derived calculations, Refinement description
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references