Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 12.10 kDa 
• Atom Count: 959 
• Modelled Residue Count: 100 
• Deposited Residue Count: 100 
• Unique protein chains: 1

1T1D

CRYSTAL STRUCTURE OF THE TETRAMERIZATION DOMAIN OF THE SHAKER POTASSIUM CHANNEL

• PDB DOI: 10.2210/pdb1T1D/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Aplysia californica
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1998-09-22 Released: 1999-01-13 
• Deposition Author(s): Kreusch, A., Pfaffinger, P.J., Stevens, C.F., Choe, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.51 Å
• R-Value Free: 0.249 
• R-Value Work: 0.229 

Literature

Zn2+-binding and molecular determinants of tetramerization in voltage-gated K+ channels.

Bixby, K.A., Nanao, M.H., Shen, N.V., Kreusch, A., Bellamy, H., Pfaffinger, P.J., Choe, S.

(1999) Nat Struct Biol 6: 38-43

• PubMed: 9886290 
• DOI: 10.1038/4911
• Primary Citation of Related Structures:  
  1T1D, 3KVT


• PubMed Abstract: 
  

The N-terminal, cytoplasmic tetramerization domain (T1) of voltage-gated K+ channels encodes molecular determinants for subfamily-specific assembly of alpha-subunits into functional tetrameric channels. Crystal structures of T1 tetramers from Shaw and Shaker subfamilies reveal a common four-layered scaffolding. Within layer 4, on the hypothetical membrane-facing side of the tetramer, the Shaw T1 tetramer contains four zinc ions; each is coordinated by a histidine and two cysteines from one monomer and by one cysteine from an adjacent monomer. The amino acids involved in coordinating the Zn2+ ion occur in a HX5CX20CC sequence motif that is highly conserved among all Shab, Shaw and Shal subfamily members, but is not found in Shaker subfamily members. We demonstrate by coimmunoprecipitation that a few characteristic residues in the subunit interface are crucial for subfamily-specific tetramerization of the T1 domains.

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Organizational Affiliation: 

The Salk Institute, Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (POTASSIUM CHANNEL KV1.1)	A	100	Aplysia californica	Mutation(s): 0
UniProt
Find proteins for Q16968 (Aplysia californica) Explore Q16968  Go to UniProtKB:  Q16968

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.51 Å
• R-Value Free: 0.249 
• R-Value Work: 0.229 
• Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.71	α = 90
b = 59.71	β = 90
c = 146.86	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	model building
REFMAC	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-09-22 
• Released Date: 1999-01-13 
Deposition Author(s): Kreusch, A., Pfaffinger, P.J., Stevens, C.F., Choe, S.

Revision History  

• Version 1.0: 1999-01-13
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance