5WJ5

Human TRPML1 channel structure in closed conformation

  • Classification: MEMBRANE PROTEIN
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens

  • Deposited: 2017-07-21 Released: 2017-10-18 
  • Deposition Author(s): Schmiege, P., Li, X.
  • Funding Organization(s): Howard Hughes Medical Institute; Endowed Scholars Program in Medical Science of UT southwestern medical center 

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.72 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Human TRPML1 channel structures in open and closed conformations.

Schmiege, P.Fine, M.Blobel, G.Li, X.

(2017) Nature 550: 366-370

  • DOI: 10.1038/nature24036
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Transient receptor potential mucolipin 1 (TRPML1) is a Ca <sup>2+ </sup>-releasing cation channel that mediates the calcium signalling and homeostasis of lysosomes. Mutations in TRPML1 lead to mucolipidosis type IV, a severe lysosomal storage disorde ...

    Transient receptor potential mucolipin 1 (TRPML1) is a Ca 2+ -releasing cation channel that mediates the calcium signalling and homeostasis of lysosomes. Mutations in TRPML1 lead to mucolipidosis type IV, a severe lysosomal storage disorder. Here we report two electron cryo-microscopy structures of full-length human TRPML1: a 3.72-Å apo structure at pH 7.0 in the closed state, and a 3.49-Å agonist-bound structure at pH 6.0 in an open state. Several aromatic and hydrophobic residues in pore helix 1, helices S5 and S6, and helix S6 of a neighbouring subunit, form a hydrophobic cavity to house the agonist, suggesting a distinct agonist-binding site from that found in TRPV1, a TRP channel from a different subfamily. The opening of TRPML1 is associated with distinct dilations of its lower gate together with a slight structural movement of pore helix 1. Our work reveals the regulatory mechanism of TRPML channels, facilitates better understanding of TRP channel activation, and provides insights into the molecular basis of mucolipidosis type IV pathogenesis.


    Organizational Affiliation

    Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.,Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.,Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.,Laboratory of Cell Biology, Howard Hughes Medical Institute, The Rockefeller University, New York, New York 10065, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mucolipin-1
A, B, C, D
580Homo sapiensMutation(s): 0 
Gene Names: MCOLN1 (ML4)
Find proteins for Q9GZU1 (Homo sapiens)
Go to Gene View: MCOLN1
Go to UniProtKB:  Q9GZU1
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.72 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-07-21 
  • Released Date: 2017-10-18 
  • Deposition Author(s): Schmiege, P., Li, X.

Funding OrganizationLocationGrant Number
Howard Hughes Medical InstituteUnited States--
Endowed Scholars Program in Medical Science of UT southwestern medical centerUnited States--

Revision History 

  • Version 1.0: 2017-10-18
    Type: Initial release
  • Version 1.1: 2017-10-25
    Type: Database references, Structure summary
  • Version 1.2: 2017-11-01
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Derived calculations
  • Version 1.4: 2018-10-03
    Type: Data collection, Other, Refinement description