6V1Q

Two-pore channel 3


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.11 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Resting state structure of the hyperdepolarization activated two-pore channel 3.

Dickinson, M.S.Myasnikov, A.Eriksen, J.Poweleit, N.Stroud, R.M.

(2020) Proc.Natl.Acad.Sci.USA 117: 1988-1993

  • DOI: 10.1073/pnas.1915144117

  • PubMed Abstract: 
  • Voltage-gated ion channels endow membranes with excitability and the means to propagate action potentials that form the basis of all neuronal signaling. We determined the structure of a voltage-gated sodium channel, two-pore channel 3 (TPC3), which g ...

    Voltage-gated ion channels endow membranes with excitability and the means to propagate action potentials that form the basis of all neuronal signaling. We determined the structure of a voltage-gated sodium channel, two-pore channel 3 (TPC3), which generates ultralong action potentials. TPC3 is distinguished by activation only at extreme membrane depolarization (V 50 ∼ +75 mV), in contrast to other TPCs and Na V channels that activate between -20 and 0 mV. We present electrophysiological evidence that TPC3 voltage activation depends only on voltage sensing domain 2 (VSD2) and that each of the three gating arginines in VSD2 reduces the activation threshold. The structure presents a chemical basis for sodium selectivity, and a constricted gate suggests a closed pore consistent with extreme voltage dependence. The structure, confirmed by our electrophysiology, illustrates the configuration of a bona fide resting state voltage sensor, observed without the need for any inhibitory ligand, and independent of any chemical or mutagenic alteration.


    Organizational Affiliation

    Department of Medicine, University of California, San Francisco, CA 94158.,Department of Neurology, University of California, San Francisco, CA 94158.,Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158; stroud@msg.ucsf.edu.,Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94158.,Chemistry and Chemical Biology Graduate Program, University of California, San Francisco, CA 94158.,Department of Physiology, University of California, San Francisco, CA 94158.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Two pore channel 3
A, B
773Danio rerioMutation(s): 0 
Gene Names: tpcn3 (gb:eh507706, TPC3)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Two-pore channel TPC3 in resting state
Find proteins for C4IXV6 (Danio rerio)
Go to UniProtKB:  C4IXV6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.11 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM24485

Revision History 

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2020-01-08
    Type: Author supporting evidence, Database references
  • Version 1.2: 2020-01-22
    Type: Database references
  • Version 1.3: 2020-02-12
    Type: Database references