卡尔帕因-MMP3的激活限制了蛋白质转导域TAT介导的蛋白质递送过程中的核吸收
Jin Hyeop Kim1,2, Eun Young Choi3, Yeon-Jun Lee1,2
1Department of Biotechnology, CHA University, Pocheon, Republic of Korea.
Protein science : a publication of the Protein Society
|January 20, 2026
概括
研究人员发现了一种新的蛋白质分解途径,限制了TAT-融合蛋白质的核输送. 抑制calpain或MMP-3可以恢复核积累,改善治疗载体设计.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- TAT蛋白转导域 (TAT-PTD) 促进了细胞蛋白质的输送.
- 细胞内命运和TAT-PTD输送系统的局限性仍然不完全理解.
- 核积累对于许多通过TAT-PTD传递的治疗性蛋白质的功能至关重要.
研究的目的:
- 阐明限制TAT融合蛋白的核输送的蛋白质分解机制.
- 为了确定涉及TAT-PTD细胞内处理的特定蛋白酶.
- 为设计改进的基于TAT的交付载体提供基础.
主要方法:
- 研究了TAT-EGFP融合蛋白的细胞内命运.
- 使用蛋白酶抑制剂 (calpain和MMP-3抑制剂) 来阻止蛋白质分解活性.
- 采用位点定向突变发生法来产生抗裂变的TAT-PTD变体 (ARA和AAR突变物).
- 使用显微镜评估蛋白质局部化 (细胞质与核).
主要成果:
- 确定了一种涉及calpain和矩阵金属蛋白酶-3 (MMP-3) 的蛋白质分解级联,该级联可以分裂TAT-EGFP.
- 通过MMP-3的N-终端裂变消除了TAT-PTD的核定位信号,导致细胞质陷.
- 抑制calpain或MMP-3恢复了完整的TAT-EGFP的核积累.
- 对C端氨酸 (ARA,AAR) 的突变产生了对裂变的抗性,增强了核传递.
结论:
- 一个新的蛋白质分解途径通过裂解融合蛋白来限制TAT-PTD核输送.
- 卡尔帕因和MMP-3是这种裂变的关键媒介,依赖于上游激活轴.
- 阻止这种级联或设计抗裂变的TAT变体可以增强核蛋白的输送和治疗疗效.
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