AbstractLipidation of the LC3 protein has frequently been employed as a marker of autophagy. However, LC3‐lipidation is also triggered by stimuli not related to canonical autophagy. Therefore, characterization of the driving parameters for LC3 lipidation is crucial to understanding the biological roles of LC3. We identified a pseudo‐natural product, termed Inducin, that increases LC3 lipidation independently of canonical autophagy, impairs lysosomal function and rapidly recruits Galectin 3 to lysosomes. Inducin treatment promotes Endosomal Sorting Complex Required for Transport (ESCRT)‐dependent membrane repair and transcription factor EB (TFEB)‐dependent lysosome biogenesis ultimately leading to cell death.
摘要 LC3 蛋白的脂化经常被用作自噬的标记。然而,与典型自噬无关的刺激也会引发 LC3 脂化。因此,鉴定 LC3 脂化的驱动参数对于了解 LC3 的生物学作用至关重要。我们发现了一种称为 "诱导素 "的伪天然产物,它能在典型自噬之外增加 LC3 脂化,损害溶酶体功能,并迅速将 Galectin 3 募集到溶酶体。诱导素处理可促进依赖于膜修复和转录因子 EB(TFEB)依赖的溶酶体生物生成的内体运输所需的分选复合物(ESCRT),最终导致细胞死亡。