赛马福林-5A的结构和功能 葡萄糖氨基酸糖相互作用
Gergely N Nagy1,2,3, Xiao-Feng Zhao4, Richard Karlsson5
1Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK. nagy.gergely.nandor@vbk.bme.hu.
Nature communications
|March 29, 2024
概括
赛马福林-5A (Sema5A) 与肝素硫酸盐 (HS) 和胆素硫酸盐 (CS) 糖氨酸甘油 (GAG) 相互作用,以引导神经元生长. 这项研究揭示了这些相互作用的结构基础,这些相互作用对大脑发育和修复至关重要.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 神经元的发育,可塑性和修复取决于整合细胞外信号.
- 轴指导涉及与细胞外基质的受体-连接体相互作用.
- 赛马福林-5A (Sema5A) 是一种双功能指导线索,与肝素硫酸盐 (HS) 和胆素硫酸盐 (CS) 糖氨酸甘油 (GAG) 相互作用.
研究的目的:
- 阐明塞玛林-5A (Sema5A) 与甘氨酸氨基甘氨酸 (GAG) 的结合特异性的结构基础.
- 研究Sema5A:GAG相互作用在神经元发育中的体内功能意义.
主要方法:
- 进行X射线晶体学以确定与GAG结合的Sema5A血栓蛋白重复 (TSR) 的结构.
- 位点定向突变发生,以验证GAG结合残留物.
- 在体外和基于细胞的测试来评估GAG结合和Sema5A寡合化.
- 在模型生物体内进行体内研究,以评估Sema5A:GAG相互作用在神经元迁移中的作用.
主要成果:
- 揭示了TSR4适应GAG结合的二维折叠变异,识别了关键残留物.
- 证明了Sema5A对HS-GAG的优先结合超过CS-GAG,通过Sema5A寡合化进行中介.
- 确定Sema5A:GAG相互作用对于Sema5A in vivo功能至关重要,调节Plexin-A2依赖的牙状原生细胞迁移.
结论:
- 结合特定的GAG,特别是HS-GAG的Sema5A对其指导功能的结构和功能至关重要.
- 这些相互作用调节神经元前代细胞在发育过程中的迁移.
- 这些发现提供了有关Sema5A相关疾病的机制性见解,以及指导线索的蛋白质甘氨酸介导调节.
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