Structural insight into TRPV5 channel function and modulation.
Dang, S., van Goor, M.K., Asarnow, D., Wang, Y., Julius, D., Cheng, Y., van der Wijst, J.(2019) Proc Natl Acad Sci U S A 116: 8869-8878
- PubMed: 30975749 
- DOI: https://doi.org/10.1073/pnas.1820323116
- Primary Citation of Related Structures:  
6O1N, 6O1P, 6O1U, 6O20 - PubMed Abstract: 
TRPV5 (transient receptor potential vanilloid 5) is a unique calcium-selective TRP channel essential for calcium homeostasis. Unlike other TRPV channels, TRPV5 and its close homolog, TRPV6, do not exhibit thermosensitivity or ligand-dependent activation but are constitutively open at physiological membrane potentials and modulated by calmodulin (CaM) in a calcium-dependent manner. Here we report high-resolution electron cryomicroscopy structures of truncated and full-length TRPV5 in lipid nanodiscs, as well as of a TRPV5 W583A mutant and TRPV5 in complex with CaM. These structures highlight the mechanism of calcium regulation and reveal a flexible stoichiometry of CaM binding to TRPV5.
Organizational Affiliation: 
Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143.