8SLE

Cryo-EM structure of the rat TRPM5 channel in trace calcium, trace-3


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: other
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural dynamics at cytosolic interprotomer interfaces control gating of a mammalian TRPM5 channel.

Karuppan, S.Schrag, L.G.Pastrano, C.M.Jara-Oseguera, A.Zubcevic, L.

(2024) Proc Natl Acad Sci U S A 121: e2403333121-e2403333121

  • DOI: https://doi.org/10.1073/pnas.2403333121
  • Primary Citation of Related Structures:  
    8SL6, 8SL8, 8SLA, 8SLE, 8SLI, 8SLP, 8SLQ, 8SLW

  • PubMed Abstract: 

    The transient receptor potential melastatin (TRPM) tetrameric cation channels are involved in a wide range of biological functions, from temperature sensing and taste transduction to regulation of cardiac function, inflammatory pain, and insulin secretion. The structurally conserved TRPM cytoplasmic domains make up >70 % of the total protein. To investigate the mechanism by which the TRPM cytoplasmic domains contribute to gating, we employed electrophysiology and cryo-EM to study TRPM5-a channel that primarily relies on activation via intracellular Ca 2+ . Here, we show that activation of mammalian TRPM5 channels is strongly altered by Ca 2+ -dependent desensitization. Structures of rat TRPM5 identify a series of conformational transitions triggered by Ca 2+ binding, whereby formation and dissolution of cytoplasmic interprotomer interfaces appear to control activation and desensitization of the channel. This study shows the importance of the cytoplasmic assembly in TRPM5 channel function and sets the stage for future investigations of other members of the TRPM family.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center, Kansas City, KS 66160.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transient receptor potential cation channel subfamily M member 5
A, B, C, D
1,169Rattus norvegicusMutation(s): 0 
Gene Names: Trpm5
Membrane Entity: Yes 
UniProt
Find proteins for F1LMD7 (Rattus norvegicus)
Explore F1LMD7 
Go to UniProtKB:  F1LMD7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF1LMD7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.30 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONcryoSPARC3.3.2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other privateUnited Statesstartup funds
Other privateUnited States--

Revision History  (Full details and data files)

  • Version 1.0: 2024-07-03
    Type: Initial release
  • Version 1.1: 2024-07-10
    Changes: Data collection, Database references