GOLPH3和GOLPH3L保持了LYSET的戈尔吉定位和一个功能性的曼诺-6酸盐运输通路
Berit K Brauer1, Zilei Chen2, Felix Beirow1
1Institute of Biochemistry, Kiel University, Kiel, Germany.
The EMBO journal
|November 25, 2024
概括
失去了lyset蛋白导致B4GALT5的高分泌,揭示了一个新的lysosomal路径. GOLPH3/GOLPH3L蛋白质通过稳定LYSET-GNPT复合体来维持这种途径,以便适当的溶解体酶功能.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 葡萄糖生物学 葡萄糖生物学
背景情况:
- 糖化对蛋白质和脂质的修饰至关重要,由戈尔吉酶活性和局部化调节.
- 控制SPPL3介导的裂变和Golgi内部的分布,控制Golgi酶的功能.
- Lysosomal 途径对于细胞废物降解和恒温是必不可少的.
研究的目的:
- 调查LYSET/TMEM251在戈尔吉蛋白贩运中的作用.
- 阐明LYSET缺乏细胞中B4GALT5高分泌背后的机制.
- 确定GOLPH3/GOLPH3L在新型 lysosomal 途径中的参与.
主要方法:
- CRISPR-Cas9基因编辑以创建缺乏LYSET的细胞系.
- 免疫光显微镜可视化蛋白质定位和贩运.
- 生物化学试验分析蛋白质复合体稳定性和M6P标记.
- 西部涂抹测试以评估蛋白质水平和修改.
主要成果:
- 莱塞特缺乏导致SPPL3依赖的B4GALT5高分泌.
- B4GALT5经历了曼6酸盐 (M6P) 标记,这表明一种新的降解性溶解体路径.
- GOLPH3/GOLPH3L适配器对于LYSET-GNPT复合体的完整性,M6P标记和 lysosomal酶稳定性至关重要.
- 莱塞特被确定为GOLPH3/GOLPH3L.L.的非典型客户.
结论:
- 由GOLPH3/GOLPH3L调节的LYSET-GNPT复合体对于M6P标记和 lysosomal功能至关重要.
- 发现了一种新的依赖M6P的降解途径,涉及B4GALT5.
- 破坏戈尔吉蛋白的局部化和贩运会影响 lysosomal homeostasis.
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