6DMU image
Deposition Date 2018-06-05
Release Date 2018-10-24
Last Version Date 2024-03-13
Entry Detail
PDB ID:
6DMU
Title:
PI(4,5)P2 bound full-length rbTRPV5
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
4.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Transient receptor potential cation channel subfamily V member 5
Gene (Uniprot):Trpv5
Chain IDs:A, B, C, D
Chain Length:730
Number of Molecules:4
Biological Source:Oryctolagus cuniculus
Ligand Molecules
Primary Citation
Structural insights on TRPV5 gating by endogenous modulators.
Nat Commun 9 4198 4198 (2018)
PMID: 30305626 DOI: 10.1038/s41467-018-06753-6

Abstact

TRPV5 is a transient receptor potential channel involved in calcium reabsorption. Here we investigate the interaction of two endogenous modulators with TRPV5. Both phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) and calmodulin (CaM) have been shown to directly bind to TRPV5 and activate or inactivate the channel, respectively. Using cryo-electron microscopy (cryo-EM), we determined TRPV5 structures in the presence of dioctanoyl PI(4,5)P2 and CaM. The PI(4,5)P2 structure reveals a binding site between the N-linker, S4-S5 linker and S6 helix of TRPV5. These interactions with PI(4,5)P2 induce conformational rearrangements in the lower gate, opening the channel. The CaM structure reveals two TRPV5 C-terminal peptides anchoring a single CaM molecule and that calcium inhibition is mediated through a cation-π interaction between Lys116 on the C-lobe of calcium-activated CaM and Trp583 at the intracellular gate of TRPV5. Overall, this investigation provides insight into the endogenous modulation of TRPV5, which has the potential to guide drug discovery.

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Primary Citation of related structures