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Updated: Jun 10, 2025

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细胞内膜网膜蛋白VAPB/ALS8的分泌需要拓逆向
Kosuke Kamemura1, Rio Kozono1, Mizuki Tando1
1Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.
Nature communications
|October 10, 2024
概括
与VAMP相关的蛋白质 (VAP) 在分泌过程中经历拓逆转. 矩阵金属蛋白酶分裂VAPMSP域,Mmp1可以恢复ALS8突变的水平,揭示了一种新的分泌途径.
科学领域:
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
- 分子生物学分子生物学
背景情况:
- 与VAMP相关的蛋白质 (VAP) 是一种ER居住的跨膜蛋白质,通过VAPB/ALS8.8的突变与肌缩性侧面硬化症 (ALS) 有关.
- 众所周知,VAPB的N端主要精子蛋白 (MSP) 域被分裂和分泌,作为信号连接体起作用.
研究的目的:
- 阐明面向细胞质的VAPB/Vap33 MSP域被分泌到细胞外空间的机制.
- 研究矩阵金属蛋白酶 (MMPs) 在Vap33 MSP域的分泌和处理中的作用.
主要方法:
- 研究了Vap33在细胞内的运输和定位.
- 利用生物化学分析来识别参与MSP域分裂的蛋白酶.
- 研究了MMP过度表达对ALS8突变Vap33.3细胞外MSP域水平的影响.
主要成果:
- Vap33被运送到等离子体膜,经历拓逆转,以细胞外暴露MSP域.
- 矩阵金属蛋白酶1和2 (Mmp1/2) 负责切割外部化MSP域.
- 在ALS8-相关的Vap33突变体中,Mmp1的过度表达拯救了减少的细胞外MSP域水平.
结论:
- 提出了一种前所未有的分泌机制,用于ER居住膜蛋白,涉及拓逆转和MMP介导的裂变.
- 这种新的VAP分泌途径可能在ALS8.8的发病过程中发挥作用.
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