在BMP-9和BMP-10中的链间二硫化物键形成的分子基础
Tristin A Schwartze1, Stefanie A Morosky2, Teresa L Rosato2
1Department of Structural Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Journal of molecular biology
|January 10, 2025
概括
骨形态遗传蛋白 (BMPs) 9和10对于血管发育至关重要. 这项研究揭示了几何应变,而不是囊化,限制了BMP-9/10二硫化物结合的二聚体形成,影响了信号传递和遗传性出血性telangiectasia.
科学领域:
- 分子和细胞生物学分子和细胞生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 骨形态遗传蛋白 (BMPs) 9和10是TGF-β家族的信号连接体,对血管发育和维护至关重要.
- 在BMP-9/10通路的突变,特别是ALK1或内分泌蛋白中,与遗传性出血性telangiectasia有关,这是一种血管疾病.
- BMP-9/10异构体是流通中的占主导地位的信号形式,但它们的形成机制仍然不太清楚.
研究的目的:
- 阐明控制BMP-9和BMP-10分泌和二聚化的机制.
- 调查BMP-9和BMP-10之间二硫化物结合二聚体的差异形成的结构基础.
- 了解BMP-9/10的单体和二体形式如何影响它们的信号强度和异体化.
主要方法:
- 采用蛋白质结晶学来确定BMP-9同极体的结构,并评估链间二硫化键的构型.
- 生物化学试验被用来评估BMP-9单体和二元体的自我关联特性和信号强度.
- 在链间二硫化物附近进行了残留物交换实验,以调查影响二硫化物键形成频率的因素.
主要成果:
- BMP-9和BMP-10单体以囊化形式分泌,能够形成非共价二元体,但显示信号效率降低.
- 蛋白质结晶学揭示了BMP-9同位体中链际二硫化物的紧张的同周平面形状,解释了罕见的二硫化键形成.
- 与BMP-10相比,BMP-9中二硫化物键的形成较少,这种差异可以通过改变参与原体间相互作用的残留物来调节.
结论:
- 在链间二硫化键上的几何应变,而不是化,是BMP-9中有限的二硫化结合二聚体形成的主要决定因素.
- BMP-9和BMP-10之间的二硫化物键形成频率差异受氨酸残留物附近的特定残留物相互作用的影响.
- 这些发现为BMP-9/10信号复合体的组装提供了关键的见解,并对理解血管发育和疾病有意义.
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