6E2F
Cryo-EM structure of human TRPV6 in complex with Calmodulin
Summary for 6E2F
Entry DOI | 10.2210/pdb6e2f/pdb |
EMDB information | 8961 |
Descriptor | Transient receptor potential cation channel subfamily V member 6, Calmodulin-1, CALCIUM ION (3 entities in total) |
Functional Keywords | trpv6, trp channels, calcium channels, membrane protein |
Biological source | Homo sapiens (Human) More |
Total number of polymer chains | 5 |
Total formula weight | 350304.32 |
Authors | Singh, A.K.,McGoldrick, L.L.,Sobolevsky, A.I. (deposition date: 2018-07-11, release date: 2018-08-22, Last modification date: 2024-03-13) |
Primary citation | Singh, A.K.,McGoldrick, L.L.,Twomey, E.C.,Sobolevsky, A.I. Mechanism of calmodulin inactivation of the calcium-selective TRP channel TRPV6. Sci Adv, 4:eaau6088-eaau6088, 2018 Cited by PubMed Abstract: Calcium (Ca) plays a major role in numerous physiological processes. Ca homeostasis is tightly controlled by ion channels, the aberrant regulation of which results in various diseases including cancers. Calmodulin (CaM)-mediated Ca-induced inactivation is an ion channel regulatory mechanism that protects cells against the toxic effects of Ca overload. We used cryo-electron microscopy to capture the epithelial calcium channel TRPV6 (transient receptor potential vanilloid subfamily member 6) inactivated by CaM. The TRPV6-CaM complex exhibits 1:1 stoichiometry; one TRPV6 tetramer binds both CaM lobes, which adopt a distinct head-to-tail arrangement. The CaM carboxyl-terminal lobe plugs the channel through a unique cation-π interaction by inserting the side chain of lysine K115 into a tetra-tryptophan cage at the pore's intracellular entrance. We propose a mechanism of CaM-mediated Ca-induced inactivation that can be explored for therapeutic design. PubMed: 30116787DOI: 10.1126/sciadv.aau6088 PDB entries with the same primary citation |
Experimental method | ELECTRON MICROSCOPY (3.9 Å) |
Structure validation
Download full validation report