1LNQ

CRYSTAL STRUCTURE OF MTHK AT 3.3 A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.318 
  • R-Value Work: 0.301 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

CRYSTAL STRUCTURE AND MECHANISM OF A CALCIUM-GATED POTASSIUM CHANNEL

JIANG, Y.LEE, A.CHEN, J.CADENE, M.CHAIT, B.T.MACKINNON, R.

(2002) Nature 417: 515-522

  • DOI: 10.1038/417515a
  • Also Cited By: 2AEM, 2AEJ

  • PubMed Abstract: 
  • Ion channels exhibit two essential biophysical properties; that is, selective ion conduction, and the ability to gate-open in response to an appropriate stimulus. Two general categories of ion channel gating are defined by the initiating stimulus: li ...

    Ion channels exhibit two essential biophysical properties; that is, selective ion conduction, and the ability to gate-open in response to an appropriate stimulus. Two general categories of ion channel gating are defined by the initiating stimulus: ligand binding (neurotransmitter- or second-messenger-gated channels) or membrane voltage (voltage-gated channels). Here we present the structural basis of ligand gating in a K(+) channel that opens in response to intracellular Ca(2+). We have cloned, expressed, analysed electrical properties, and determined the crystal structure of a K(+) channel (MthK) from Methanobacterium thermoautotrophicum in the Ca(2+)-bound, opened state. Eight RCK domains (regulators of K(+) conductance) form a gating ring at the intracellular membrane surface. The gating ring uses the free energy of Ca(2+) binding in a simple manner to perform mechanical work to open the pore.


    Related Citations: 
    • THE OPEN PORE CONFORMATION OF POTASSIUM CHANNELS
      JIANG, Y.,LEE, A.,CHEN, J.,CADENE, M.,CHAIT, B.T.,MACKINNON, R.
      (2002) Nature 417: 523


    Organizational Affiliation

    Howard Hughes Medical Institute, Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, 1230 York Avenue, New York, New York 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
POTASSIUM CHANNEL RELATED PROTEIN
A, B, C, D, E, F, G, H
336Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H)Mutation(s): 0 
Gene Names: mthK
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
MthK Potassium channel, Ca++ gated
Find proteins for O27564 (Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H))
Go to UniProtKB:  O27564
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.318 
  • R-Value Work: 0.301 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 137.000α = 90.00
b = 137.000β = 90.00
c = 373.300γ = 120.00
Software Package:
Software NamePurpose
MLPHAREphasing
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-06-19
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2014-11-12
    Type: Structure summary