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: 23 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


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 Biol 6: 146-150

  • DOI: https://doi.org/10.1038/5833
  • Primary Citation of Related Structures:  
    1B4G, 1B4I

  • 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 (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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
POTASSIUM CHANNEL30Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q03721 (Homo sapiens)
Explore Q03721 
Go to UniProtKB:  Q03721
PHAROS:  Q03721
GTEx:  ENSG00000116396 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ03721
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SEP
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 23 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-23
    Changes: Database references, Derived calculations, Other