Biological Assembly 1  

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 260.34 kDa 
• Atom Count: 14,640 
• Modelled Residue Count: 1,828 
• Deposited Residue Count: 2,320 
• Unique protein chains: 1

 5WJ5

Human TRPML1 channel structure in closed conformation

• PDB DOI:  https://doi.org/10.2210/pdb5WJ5/pdb
• EM Map EMD-8840: EMDB EMDataResource

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMD


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

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Experimental Data Snapshot

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

Literature

Human TRPML1 channel structures in open and closed conformations.

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

(2017) Nature 550: 366-370

• PubMed: 29019983 
• DOI: https://doi.org/10.1038/nature24036
• Primary Citation of Related Structures:  
  5WJ5, 5WJ9


• PubMed Abstract: 
  

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.

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Organizational Affiliation: 

Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Mucolipin-1	A, B, C, D	580	Homo sapiens	Mutation(s): 0  Gene Names: MCOLN1, ML4, MSTP080, TRPML1 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for Q9GZU1 (Homo sapiens) Explore Q9GZU1  Go to UniProtKB:  Q9GZU1
PHAROS:  Q9GZU1

Experimental Data & Validation

Experimental Data

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

EM Software:

Task	Software Package	Version
RECONSTRUCTION	FREALIGN

Structure Validation

Entry History & Funding Information

Deposition Data

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

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Funding Organization	Location	Grant Number
Howard Hughes Medical Institute (HHMI)	United States	--
Endowed Scholars Program in Medical Science of UT southwestern medical center	United States	--

Revision History  

• Version 1.0: 2017-10-18
  Type: Initial release
  
• Version 1.1: 2017-10-25
  Changes: Database references, Structure summary
• Version 1.2: 2017-11-01
  Changes: Database references
• Version 1.3: 2017-11-08
  Changes: Derived calculations
• Version 1.4: 2018-10-03
  Changes: Data collection, Other, Refinement description
• Version 1.5: 2019-11-20
  Changes: Author supporting evidence
• Version 1.6: 2019-12-18
  Changes: Other