中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-氨基-2-氰基-N-(4-甲氧基苯基)-乙酰胺 | 2-Amino-2-cyano-N-(4-methoxy-phenyl)-acetamide | 287474-38-8 | C10H11N3O2 | 205.216 |
—— | 3-amino-N-(4-methoxyphenyl)-3-thioxopropanamide | 102817-90-3 | C10H12N2O2S | 224.283 |
—— | (E)-N-hydroxy-2-((4-methoxyphenyl)amino)-2-oxoacetimidoyl cyanide | 1263303-94-1 | C10H9N3O3 | 219.2 |
—— | 2-cyano-3-hydroxy-N-(4-methoxyphenyl)but-2-enamide | 62004-22-2 | C12H12N2O3 | 232.239 |
—— | 2-cyano-N-(4-methoxyphenyl)-3,3-bis(methylthio)acrylamide | 107462-98-6 | C13H14N2O2S2 | 294.398 |
—— | (E)-2-cyano-N-(4-methoxyphenyl)-3-phenylprop-2-enamide | —— | C17H14N2O2 | 278.3 |
—— | N-(4-methoxyphenyl)-3-oxo-3-phenylpropanamide | 965-50-4 | C16H15NO3 | 269.3 |
—— | 2-Cyano-2-cyclohexylidene-N-(4-methoxy-phenyl)-acetamide | 89733-18-6 | C16H18N2O2 | 270.331 |
Ion selectivity is a defining feature of a given ion channel and is considered immutable. Here we show that ion selectivity of the lysosomal ion channel TPC2, which is hotly debated (Calcraft et al., 2009; Guo et al., 2017; Jha et al., 2014; Ruas et al., 2015; Wang et al., 2012), depends on the activating ligand. A high-throughput screen identified two structurally distinct TPC2 agonists. One of these evoked robust Ca2+-signals and non-selective cation currents, the other weaker Ca2+-signals and Na+-selective currents. These properties were mirrored by the Ca2+-mobilizing messenger, NAADP and the phosphoinositide, PI(3,5)P2, respectively. Agonist action was differentially inhibited by mutation of a single TPC2 residue and coupled to opposing changes in lysosomal pH and exocytosis. Our findings resolve conflicting reports on the permeability and gating properties of TPC2 and they establish a new paradigm whereby a single ion channel mediates distinct, functionally-relevant ionic signatures on demand.