由细胞外矩阵受体dystroglycan调节蛋白质分解裂变的分子基础
Michael J M Anderson1, Amanda N Hayward1, Adam T Smiley1
1Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota-Twin Cities, Minneapolis, MN 55455, USA.
矩阵金属蛋白酶 (MMPs) 切割双甘氨酸,破坏双甘氨酸蛋白复合体 (DGC). 我们解决了dystroglycan结构,揭示了调节MMP裂变的新型机制,这对于理解肌肉衰竭至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 消毒素-糖蛋白复合体 (DGC) 对于将细胞外基质与actin细胞骨连接至关重要.
- 干扰DGC与肌肉发育不良有关.
- 通过矩阵金属蛋白酶 (MMPs) 裂解双糖是一种影响DGC完整性的研究不足的机制.
研究的目的:
- 为了确定人体dystroglycan的膜相邻域的晶体结构.
- 为了阐明调节MMP裂变的机制的dystroglycan.
- 调查蛋白质分解在DGC破坏和疾病发病过程中的作用.
主要方法:
- 在大肠杆菌中表达和净化人类二氧化糖 (氨基酸491-722) .
- 进行X射线晶体学以确定蛋白质的三维结构.
- 细胞表面蛋白质溶解试验用于评估突变对蛋白质溶解调节的影响.
主要成果:
- 晶体结构揭示了双重免疫球蛋白类 (IGL) 和精子/内酶/亚格林类 (SEAL) 域.
- 确定了一种C端延伸,将MMP切割部位埋在疏水口袋中.
- 结构导向和与疾病相关的突变被证明会破坏蛋白质分解调节.
结论:
- 鉴定的结构机制为对MMP在dystroglycan上的裂变调节提供了新的见解.
- 被破坏的双糖蛋白质分解代表了一个潜在的机制,有助于DGC功能障碍和疾病.
- 了解这种调节机制对于开发有关肌肉疾病的治疗策略至关重要.
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