7xem | pdb_00007xem
Cholesterol bound state of mTRPV2
Structural highlights
FunctionTRPV2_MOUSE Calcium-permeable, non-selective cation channel with an outward rectification. Seems to be regulated, at least in part, by IGF-I, PDGF and neuropeptide head activator. May transduce physical stimuli in mast cells. Activated by temperatures higher than 52 degrees Celsius; is not activated by vanilloids and acidic pH.[1] [2] Publication Abstract from PubMedThe transient receptor potential vanilloid 2 (TRPV2) ion channel is a polymodal receptor widely involved in many physiological and pathological processes. Despite many TRPV2 modulators being identified, whether and how TRPV2 is regulated by endogenous lipids remains elusive. Here, we report an endogenous cholesterol molecule inside the vanilloid binding pocket (VBP) of TRPV2, with a 'head down, tail up' configuration, resolved at 3.2 A using cryo-EM. Cholesterol binding antagonizes ligand activation of TRPV2, which is removed from VBP by methyl-beta-cyclodextrin (MbetaCD) as resolved at 2.9 A. We also observed that estradiol (E2) potentiated TRPV2 activation by 2-aminoethoxydiphenyl borate (2-APB), a classic tool compound for TRP channels. Our cryo-EM structures (resolved at 2.8-3.3 A) further suggest how E2 disturbed cholesterol binding and how 2-APB bound within the VBP with E2 or without both E2 and endogenous cholesterol, respectively. Therefore, our study has established the structural basis for ligand recognition of the inhibitory endogenous cholesterol and excitatory exogenous 2-APB in TRPV2. Structural mechanisms of TRPV2 modulation by endogenous and exogenous ligands.,Su N, Zhen W, Zhang H, Xu L, Jin Y, Chen X, Zhao C, Wang Q, Wang X, Li S, Wen H, Yang W, Guo J, Yang F Nat Chem Biol. 2023 Jan;19(1):72-80. doi: 10.1038/s41589-022-01139-8. Epub 2022 , Sep 26. PMID:36163384[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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