6V9X

Structure of TRPA1 modified by iodoacetamide, PMAL-C8


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 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

Irritant-evoked activation and calcium modulation of the TRPA1 receptor.

Zhao, J.Lin King, J.V.Paulsen, C.E.Cheng, Y.Julius, D.

(2020) Nature 585: 141-145

  • DOI: https://doi.org/10.1038/s41586-020-2480-9
  • Primary Citation of Related Structures:  
    6V9V, 6V9W, 6V9X, 6V9Y

  • PubMed Abstract: 

    The transient receptor potential ion channel TRPA1 is expressed by primary afferent nerve fibres, in which it functions as a low-threshold sensor for structurally diverse electrophilic irritants, including small volatile environmental toxicants and endogenous algogenic lipids 1 . TRPA1 is also a 'receptor-operated' channel whose activation downstream of metabotropic receptors elicits inflammatory pain or itch, making it an attractive target for novel analgesic therapies 2 . However, the mechanisms by which TRPA1 recognizes and responds to electrophiles or cytoplasmic second messengers remain unknown. Here we use strutural studies and electrophysiology to show that electrophiles act through a two-step process in which modification of a highly reactive cysteine residue (C621) promotes reorientation of a cytoplasmic loop to enhance nucleophilicity and modification of a nearby cysteine (C665), thereby stabilizing the loop in an activating configuration. These actions modulate two restrictions controlling ion permeation, including widening of the selectivity filter to enhance calcium permeability and opening of a canonical gate at the cytoplasmic end of the pore. We propose a model to explain functional coupling between electrophile action and these control points. We also characterize a calcium-binding pocket that is highly conserved across TRP channel subtypes and accounts for all aspects of calcium-dependent TRPA1 regulation, including potentiation, desensitization and activation by metabotropic receptors. These findings provide a structural framework for understanding how a broad-spectrum irritant receptor is controlled by endogenous and exogenous agents that elicit or exacerbate pain and itch.


  • Organizational Affiliation

    Department of Biochemistry and Biophysics and Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transient receptor potential cation channel subfamily A member 1A,
B,
C [auth D],
D [auth C]
1,119Homo sapiensMutation(s): 1 
Gene Names: TRPA1ANKTM1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O75762 (Homo sapiens)
Explore O75762 
Go to UniProtKB:  O75762
PHAROS:  O75762
GTEx:  ENSG00000104321 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO75762
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
YCM
Query on YCM
A,
B,
C [auth D],
D [auth C]
L-PEPTIDE LINKINGC5 H10 N2 O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR35 NS105038
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM098672

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-06
    Type: Initial release
  • Version 1.1: 2020-07-08
    Changes: Database references
  • Version 1.2: 2020-07-22
    Changes: Database references
  • Version 1.3: 2020-07-29
    Changes: Database references, Structure summary
  • Version 1.4: 2020-09-16
    Changes: Database references