1KN7

Solution structure of the tandem inactivation domain (residues 1-75) of potassium channel RCK4 (Kv1.4)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the least restraint violations,target function 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution Structure and Function of the "Tandem Inactivation Domain" of the Neuronal A-type Potassium Channel Kv1.4

Wissmann, R.Bildl, W.Oliver, D.Beyermann, M.Kalbitzer, H.R.Bentrop, D.Fakler, B.

(2003) J.Biol.Chem. 278: 16142-16150

  • DOI: 10.1074/jbc.M210191200

  • PubMed Abstract: 
  • Cumulative inactivation of voltage-gated (Kv) K(+) channels shapes the presynaptic action potential and determines timing and strength of synaptic transmission. Kv1.4 channels exhibit rapid "ball-and-chain"-type inactivation gating. Different from al ...

    Cumulative inactivation of voltage-gated (Kv) K(+) channels shapes the presynaptic action potential and determines timing and strength of synaptic transmission. Kv1.4 channels exhibit rapid "ball-and-chain"-type inactivation gating. Different from all other Kvalpha subunits, Kv1.4 harbors two inactivation domains at its N terminus. Here we report the solution structure and function of this "tandem inactivation domain" using NMR spectroscopy and patch clamp recordings. Inactivation domain 1 (ID1, residues 1-38) consists of a flexible N terminus anchored at a 5-turn helix, whereas ID2 (residues 40-50) is a 2.5-turn helix made up of small hydrophobic amino acids. Functional analysis suggests that only ID1 may work as a pore-occluding ball domain, whereas ID2 most likely acts as a "docking domain" that attaches ID1 to the cytoplasmic face of the channel. Deletion of ID2 slows inactivation considerably and largely impairs cumulative inactivation. Together, the concerted action of ID1 and ID2 may promote rapid inactivation of Kv1.4 that is crucial for the channel function in short term plasticity.


    Organizational Affiliation

    Department of Physiology II, University of Freiburg, Hermann-Herder-Strasse 7, 79104 Freiburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
VOLTAGE-GATED POTASSIUM CHANNEL PROTEIN KV1.4
A
78Rattus norvegicusMutation(s): 0 
Gene Names: Kcna4
Find proteins for P15385 (Rattus norvegicus)
Go to UniProtKB:  P15385
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the least restraint violations,target function 
  • Olderado: 1KN7 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance