1B4G

CONTROL OF K+ CHANNEL GATING BY PROTEIN PHOSPHORYLATION: STRUCTURAL SWITCHES OF THE INACTIVATION GATE, NMR, 22 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 22 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Control of K+ channel gating by protein phosphorylation: structural switches of the inactivation gate.

Antz, C.Bauer, T.Kalbacher, H.Frank, R.Covarrubias, M.Kalbitzer, H.R.Ruppersberg, J.P.Baukrowitz, T.Fakler, B.

(1999) Nat.Struct.Mol.Biol. 6: 146-150

  • DOI: 10.1038/5833
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Fast N-type inactivation of voltage-dependent potassium (Kv) channels controls membrane excitability and signal propagation in central neurons and occurs by a 'ball-and-chain'-type mechanism. In this mechanism an N-terminal protein domain (inactivati ...

    Fast N-type inactivation of voltage-dependent potassium (Kv) channels controls membrane excitability and signal propagation in central neurons and occurs by a 'ball-and-chain'-type mechanism. In this mechanism an N-terminal protein domain (inactivation gate) occludes the pore from the cytoplasmic side. In Kv3.4 channels, inactivation is not fixed but is dynamically regulated by protein phosphorylation. Phosphorylation of several identified serine residues on the inactivation gate leads to reduction or removal of fast inactivation. Here, we investigate the structure-function basis of this phospho-regulation with nuclear magnetic resonance (NMR) spectroscopy and patch-clamp recordings using synthetic inactivation domains (ID). The dephosphorylated ID exhibited compact structure and displayed high-affinity binding to its receptor. Phosphorylation of serine residues in the N- or C-terminal half of the ID resulted in a loss of overall structural stability. However, depending on the residue(s) phosphorylated, distinct structural elements remained stable. These structural changes correlate with the distinct changes in binding and unbinding kinetics underlying the reduced inactivation potency of phosphorylated IDs.


    Organizational Affiliation

    Department of Physiology II, University of Tübingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
POTASSIUM CHANNEL
A
30Homo sapiensMutation(s): 0 
Gene Names: KCNC4 (C1orf30)
Find proteins for Q03721 (Homo sapiens)
Go to Gene View: KCNC4
Go to UniProtKB:  Q03721
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
A
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 22 
  • Olderado: 1B4G Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-04-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance