由α,β和γ原cadherins之间的组合性同型相互作用产生的单细胞身份
Chan Aye Thu1, Weisheng V Chen1, Rotem Rubinstein2
1Department of Biochemistry and Molecular Biophysics, Columbia University Medical Center, 701 W 168th Street, New York, NY 10032, USA.
哺乳动物神经元使用原始干素 (Pcdh) 进行神经电路组装. 特定的Pcdh相互作用确保了细胞的身份,EC6域对于传递和组合识别至关重要.
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
- 细胞生物学 细胞生物学
背景情况:
- 哺乳动物的神经元表达各种原cadherin (Pcdh) 蛋白质 (α,β,γ 子家族).
- 通过细胞对细胞的粘附,PCDH蛋白对神经电路组合至关重要.
- 随机表达Pcdh剧目有助于神经元的身份.
研究的目的:
- 为了研究聚类Pcdh亚家族的同性相互作用特点.
- 确定 cis 相互作用和 EC6 域在 Pcdhα 细胞表面传递中的作用.
- 分析Pcdh异型组合如何产生单细胞身份的细胞表面多样性.
主要方法:
- 分析各种Pcdh异形组合之间的同性相互作用.
- 对Pcdhα异型的细胞表面传递机制的研究.
- 理论建模Pcdh多重体识别单元和异型耐受性.
主要成果:
- 这三个Pcdh亚家族 (α,β,γ) 都表现出特定的同类相互作用.
- Pcdhα细胞表面的传递取决于与其他Pcdhs的cis相互作用,关键涉及EC6域.
- 组合识别特异性对所有表达的异构体敏感;单个不匹配可以破坏相互作用.
- 理论分析支持Pcdh异形组装为细胞身份的多重体单元,由于自我识别和非自我歧视的局限性.
结论:
- Pcdh同型相互作用具有高度的特异性,并且取决于整个表达的异型谱.
- EC6域对于Pcdhα表面呈现和适当的细胞粘附至关重要.
- Pcdh组合表达产生了足够多样性的单细胞身份,但在识别机制面临限制.
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