1EOD | pdb_00001eod

CRYSTAL STRUCTURE OF THE N136D MUTANT OF A SHAKER T1 DOMAIN

• PDB DOI: https://doi.org/10.2210/pdb1EOD/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Aplysia californica
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2000-03-22 Released: 2000-05-02 
• Deposition Author(s): Nanao, M.H., Cushman, S.J., Jahng, A.W., DeRubeis, D., Choe, S., Pfaffinger, P.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 
  0.234 (Depositor) 
• R-Value Work: 
  0.211 (Depositor) 
• R-Value Observed: 
  0.211 (Depositor) 

Literature

Voltage dependent activation of potassium channels is coupled to T1 domain structure.

Cushman, S.J., Nanao, M.H., Jahng, A.W., DeRubeis, D., Choe, S., Pfaffinger, P.J.

(2000) Nat Struct Biol 7: 403-407

• PubMed: 10802739 
• DOI: https://doi.org/10.1038/75185
• Primary Citation Related Structures: 
  1EOD, 1EOE, 1EOF


• PubMed Abstract: 
  

  The T1 domain, a highly conserved cytoplasmic portion at the N-terminus of the voltage-dependent K+ channel (Kv) alpha-subunit, is responsible for driving and regulating the tetramerization of the alpha-subunits. Here we report the identification of a set of mutations in the T1 domain that alter the gating properties of the Kv channel. Two mutants produce a leftward shift in the activation curve and slow the channel closing rate while a third mutation produces a rightward shift in the activation curve and speeds the channel closing rate. We have determined the crystal structures of T1 domains containing these mutations. Both of the leftward shifting mutants produce similar conformational changes in the putative membrane facing surface of the T1 domain. These results suggest that the structure of the T1 domain in this region is tightly coupled to the channel's gating states.

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Organizational Affiliation: 
• Division of Neuroscience, S613, Baylor College of Medicine, 1 Baylor Plaza, Houston, Texas 77030, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 12.1 kDa 
• Atom Count: 888 
• Modeled Residue Count: 100 
• Deposited Residue Count: 100 
• Unique protein chains: 1

Macromolecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free:  0.234 (Depositor) 
• R-Value Work:  0.211 (Depositor) 
• R-Value Observed: 0.211 (Depositor) 

Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.464	α = 90
b = 59.464	β = 90
c = 146.889	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-05-02 
Deposition Author(s): Nanao, M.H., Cushman, S.J., Jahng, A.W., DeRubeis, D., Choe, S., Pfaffinger, P.J.

Revision History  

• Version 1.0: 2000-05-02
  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: 2018-01-31
  Changes: Experimental preparation
• Version 1.4: 2021-11-03
  Changes: Database references
• Version 1.5: 2024-02-07
  Changes: Data collection