8v6k
From Proteopedia
Apo-state cryo-EM structure of human TRPV3 in cNW30 nanodiscs
Structural highlights
DiseaseTRPV3_HUMAN Mutilating palmoplantar keratoderma with periorificial keratotic plaques. The disease is caused by mutations affecting the gene represented in this entry. The disease is caused by mutations affecting the gene represented in this entry. FunctionTRPV3_HUMAN Putative receptor-activated non-selective calcium permeant cation channel. It is activated by innocuous (warm) temperatures and shows an increased response at noxious temperatures greater than 39 degrees Celsius. Activation exhibits an outward rectification. May associate with TRPV1 and may modulate its activity. Is a negative regulator of hair growth and cycling: TRPV3-coupled signaling suppresses keratinocyte proliferation in hair follicles and induces apoptosis and premature hair follicle regression (catagen).[1] [2] [3] Publication Abstract from PubMedTRPV3 represents both temperature- and ligand-activated transient receptor potential (TRP) channel. Physiologically relevant opening of TRPV3 channels by heat has been captured structurally, while opening by agonists has only been observed in structures of mutant channels. Here, we present cryo-EM structures that illuminate opening and inactivation of wild-type human TRPV3 in response to binding of two types of agonists: either the natural cannabinoid tetrahydrocannabivarin (THCV) or synthetic agonist 2-aminoethoxydiphenylborane (2-APB). We found that THCV binds to the vanilloid site, while 2-APB binds to the S1-S4 base and ARD-TMD linker sites. Despite binding to distally located sites, both agonists induce similar pore opening and cause dissociation of a lipid that occupies the vanilloid site in their absence. Our results uncover different but converging allosteric pathways through which small-molecule agonists activate TRPV3 and provide a framework for drug design and understanding the role of lipids in ion channel function. TRPV3 activation by different agonists accompanied by lipid dissociation from the vanilloid site.,Nadezhdin KD, Neuberger A, Khosrof LS, Talyzina IA, Khau J, Yelshanskaya MV, Sobolevsky AI Sci Adv. 2024 May 3;10(18):eadn2453. doi: 10.1126/sciadv.adn2453. Epub 2024 May , 1. PMID:38691614[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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