Mucolipins 1-3 are ion channel proteins that belong to the transient receptor potential (TRP) superfamily of cation channels and are the major Ca2+-permeable channels on late endosomes and lysosomes (LEL). This entry represents the extracytosolic domain (ECD) which consists of two beta sheets and two extracytosolic helices that tetramerize into a ring that caps the extracytosolic side of the channel [1-5].

1: Structural basis of dual Ca(2+)/pH regulation of the endolysosomal TRPML1 channel. Li M, Zhang WK, Benvin NM, Zhou X, Su D, Li H, Wang S, Michailidis IE, Tong L, Li X, Yang J; Nat Struct Mol Biol. 2017;24:205-213. PMID:28112729

2: Cryo-electron microscopy structure of the lysosomal calcium-permeable channel TRPML3. Hirschi M, Herzik MA Jr, Wie J, Suo Y, Borschel WF, Ren D, Lander GC, Lee SY; Nature. 2017;550:411-414. PMID:29019979

3: Human TRPML1 channel structures in open and closed conformations. Schmiege P, Fine M, Blobel G, Li X; Nature. 2017;550:366-370. PMID:29019983

4: Structure of mammalian endolysosomal TRPML1 channel in nanodiscs. Chen Q, She J, Zeng W, Guo J, Xu H, Bai XC, Jiang Y; Nature. 2017;550:415-418. PMID:29019981

5: Cryo-EM structures of the mammalian endo-lysosomal TRPML1 channel elucidate the combined regulation mechanism. Zhang S, Li N, Zeng W, Gao N, Yang M; Protein Cell. 2017;8:834-847. PMID:28936784