CAPN15是一种非蛋白质体,无素导向的calpain蛋白酶,通过裂解E-cadherin来调节细胞粘附
Aya Noguchi1, Hikaru Tsuchiya2, Hiroshi Shitara3
1Calpain Project, Department of Basic Medical Sciences, Tokyo Metropolitan Institute of Medical Science (TMiMS), Tokyo, Japan.
The Journal of biological chemistry
|December 11, 2025
概括
卡尔帕因-15 (CAPN15) 作为一种泛素导向蛋白酶,降解E-cadherin以调节细胞粘附. 这种蛋白酶利用其指域准无处不在的E-cadherin,揭示了一种控制细胞与细胞相互作用的新途径.
科学领域:
- 生物化学 生化学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 卡尔帕因-15 (CAPN15) 是一种具有独特N端Zn2+指域的蛋白酶.
- 目前尚不清楚CAPN15的Zn2+指域在其生物作用中的功能.
研究的目的:
- 阐明CAPN15的功能,特别是其Zn2+指域.
- 研究CAPN15在调节细胞表面蛋白和细胞粘附中的作用.
主要方法:
- 使用CAPN15淘汰 (KO) 和野生型 (WT) 培养的上皮细胞.
- 在救援实验中使用了无蛋白酶活性和无素结合缺陷的CAPN15突变体.
- 检查了E-cadherin的局部化和细胞形态.
- 分析了Capn15 KO小鼠上皮组织.
主要成果:
- CAPN15的功能是作为一种非蛋白质体的,无处不在的素导向蛋白酶.
- CAPN15 KO细胞表现出细胞表面E-cadherin的增加和细胞粘附的增强.
- CAPN15通过其Zn2+指区域识别了无处不在的E-cadherin-catenin复合体,并将E-cadherin.
- 截断的E-cadherin是溶酶体降解的目标,证实CAPN15是E-cadherin的负调节者.
- 在Capn15 KO小鼠组织中观察到E-cadherin的积累,验证了体内相关性.
结论:
- CAPN15通过依赖于全方位素的方式通过裂解E-cadherin来调节细胞粘附.
- CAPN15的N端Zn2+指域对于识别无处不在的基质至关重要.
- 这项研究揭示了一种新的依赖于全方位素的蛋白质溶解途径,该途径涉及CAPN15控制细胞粘附.
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