1DSX

KV1.2 T1 DOMAIN, RESIDUES 33-119, T46V MUTANT

• PDB DOI: https://doi.org/10.2210/pdb1DSX/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2000-01-10 Released: 2000-09-20 
• Deposition Author(s): Minor Jr., D.L., Lin, Y.-F., Mobley, B.C., Avelar, A., Jan, Y.N., Jan, L.Y., Berger, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.279 
• R-Value Work: 0.237 

Literature

The polar T1 interface is linked to conformational changes that open the voltage-gated potassium channel.

Minor, D.L., Lin, Y.F., Mobley, B.C., Avelar, A., Jan, Y.N., Jan, L.Y., Berger, J.M.

(2000) Cell 102: 657-670

• PubMed: 11007484 
• DOI: https://doi.org/10.1016/s0092-8674(00)00088-x
• Primary Citation of Related Structures:  
  1DSX, 1QDV, 1QDW


• PubMed Abstract: 
  

  Kv voltage-gated potassium channels share a cytoplasmic assembly domain, T1. Recent mutagenesis of two T1 C-terminal loop residues implicates T1 in channel gating. However, structural alterations of these mutants leave open the question concerning direct involvement of T1 in gating. We find in mammalian Kv1.2 that gating depends critically on residues at complementary T1 surfaces in an unusually polar interface. An isosteric mutation in this interface causes surprisingly little structural alteration while stabilizing the closed channel and increasing the stability of T1 tetramers. Replacing T1 with a tetrameric coiled-coil destabilizes the closed channel. Together, these data suggest that structural changes involving the buried polar T1 surfaces play a key role in the conformational changes leading to channel opening.

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Organizational Affiliation: 

Howard Hughes Medical Institute and Department of Physiology, University of California, San Francisco 94143, USA. [e-mail]

Biological Assembly 1  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 83.97 kDa 
• Atom Count: 6,495 
• Modelled Residue Count: 696 
• Deposited Residue Count: 696 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (KV1.2 VOLTAGE-GATED POTASSIUM CHANNEL)	A, B, C, D, E, F, G, H	87	Rattus norvegicus	Mutation(s): 1
UniProt
Find proteins for P63142 (Rattus norvegicus) Explore P63142  Go to UniProtKB:  P63142

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.279 
• R-Value Work: 0.237 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.39	α = 90
b = 78.398	β = 90
c = 126.924	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-09-20 
Deposition Author(s): Minor Jr., D.L., Lin, Y.-F., Mobley, B.C., Avelar, A., Jan, Y.N., Jan, L.Y., Berger, J.M.

Revision History  

• Version 1.0: 2000-09-20
  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: 2021-11-03
  Changes: Database references
• Version 1.4: 2024-02-07
  Changes: Data collection