在抗体轻链可变域中,存在多个聚合途径的动态证据
Sherry Wong1, Madeline E West1, Gareth J Morgan1
1Boston University Amyloidosis Center, Boston University Chobanian and Avedisian School of Medicine, Boston, Massachusetts, USA.
Protein science : a publication of the Protein Society
|December 15, 2023
概括
抗体轻链蛋白聚合,与轻链氨基粉症相关,显示复杂的动力学. 蛋白质度和播种影响聚合率,这表明多种物种有助于疾病病理.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 蛋白质错折叠疾病 蛋白质错折叠疾病
背景情况:
- 轻链 Amyloidosis 是一种与抗体轻链蛋白聚合相关的渐进性疾病.
- 粉样纤维从非原生状态的轻链可变域中形成,需要从原生结构中展开.
- 机理学研究往往侧重于内在无序的,使得原生状态的作用变得不那么被理解.
研究的目的:
- 研究蛋白质度和纤维细胞播种对轻链蛋白质聚合的动力学的影响.
- 探索原生状态在抗体光链的聚合过程中发挥的作用.
- 在实验室中描述轻链可变域蛋白WIL的复杂聚合行为.
主要方法:
- 利用提奥夫拉T光来监测聚合动力学.
- 在不同蛋白质度下研究了轻链可变域蛋白WIL的聚合.
- 评估了预先形成的纤维细胞种子和N-或C-终端标签对聚合的影响.
主要成果:
- 聚合率表现出对蛋白质度的非线性依赖,达到8μM的峰值.
- 预先形成的纤维细胞种子加速了聚合,但没有消除最初的滞后阶段.
- 种子和发生在每1600个蛋白质分子中的1个种子的比例.
- 标签修改了依赖度的聚合行为,但没有显著改变蛋白质的稳定性.
结论:
- 轻链蛋白质的体外聚合是复杂的,涉及多种物种,受度和播种的影响.
- 原生状态的展开在轻链聚合中起着至关重要的作用,与内在无序的类自我组合不同.
- 了解这些复杂的聚合动态对于阐明患者的粉样蛋白病理学至关重要.
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