7mgl
From Proteopedia
Structure of human TRPML1 with ML-SI3
Structural highlights
Disease[MCLN1_HUMAN] Mucolipidosis type 4. The disease is caused by mutations affecting the gene represented in this entry. Function[MCLN1_HUMAN] Cation channel probably playing a role in the endocytic pathway and in the control of membrane trafficking of proteins and lipids. Could play a major role in Ca(2+) transport regulating lysosomal exocytosis.[1] [2] Publication Abstract from PubMedTransient receptor potential mucolipin 1 (TRPML1) regulates lysosomal calcium signaling, lipid trafficking, and autophagy-related processes. This channel is regulated by phosphoinositides and the low pH environment of the lysosome, maintaining calcium levels essential for proper lysosomal function. Recently, several small molecules specifically targeting the TRPML family have been demonstrated to modulate channel activity. One of these, a synthetic antagonist ML-SI3, can prevent lysosomal calcium efflux and has been reported to block downstream TRPML1-mediated induction of autophagy. Here, we report a cryo-electron microscopy structure of human TRPML1 with ML-SI3 at 2.9-A resolution. ML-SI3 binds to the hydrophobic cavity created by S5, S6, and PH1, the same cavity where the synthetic agonist ML-SA1 binds. Electrophysiological characterizations show that ML-SI3 can compete with ML-SA1, blocking channel activation yet does not inhibit PI(3,5)P2-dependent activation of the channel. Consequently, this work provides molecular insight into how ML-SI3 and native lipids regulate TRPML1 activity. Atomic insights into ML-SI3 mediated human TRPML1 inhibition.,Schmiege P, Fine M, Li X Structure. 2021 Jun 19. pii: S0969-2126(21)00207-0. doi:, 10.1016/j.str.2021.06.003. PMID:34171299[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
| ||||||||||||||||||||
Categories: Human | Large Structures | Li, X | Schmiege, P | Calcium | Membrane protein | Ml-si3 | Trpml
