发现了一种具有独特性质的哺乳动物神经特异性多A结合蛋白
Sahil Sharma1, Sam Kajjo1, Zineb Harra1
1Lady Davis Institute for Medical Research, Jewish General Hospital, Montreal, Quebec H3T 1E2, Canada.
Genes & development
|September 13, 2023
概括
科学家们发现了一种新的特定于大脑的蛋白质,神经多A结合蛋白 (neuPABP),它通过与特定的RNA相互作用来调节基因表达,并且无法支持蛋白质合成.
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
- 基因表达规范 基因表达规范
背景情况:
- 这种mRNA 3' poly(A) 尾巴对于调节mRNA翻译和转换至关重要.
- 细胞质多A结合蛋白 (PABPCs) 结合多A尾部,与转化因子和衰变机制相互作用.
- 哺乳动物PABPC1通过与真核细胞翻译启动因子4G (eIF4G) 相互作用来刺激翻译.
研究的目的:
- 在哺乳动物中识别和描述新型PABPC家族成员.
- 研究一种新发现的大脑特异性PABPC的功能和调节,称为neuPABP.
- 了解neuPABP在神经元基因表达和蛋白质合成中的作用.
主要方法:
- 生物信息分析和蛋白质表征.
- 在神经元中进行RNA免疫沉降和局部化研究.
- 在体外蛋白质合成试验.
主要成果:
- 鉴定出一种新的PABPC,neuPABP,主要表达在大脑中.
- neuPABP展示了一个独特的架构,有两个RRM和一个独特的N终端域.
- 在synaptogenesis过程中,neuPABP定位到神经元 soma 和 postsynaptic 密度.
- 新PABP与核糖体/线粒体蛋白质的BC1非编码RNA和mRNA相互作用.
- 与PABPC1不同,neuPABP不结合eIF4G,也不支持体外蛋白质合成.
结论:
- 哺乳动物在大脑中拥有扩大的PABPC谱,包括neuPABP.
- neuPABP无法绑定eIF4G,这表明它在翻译压制中发挥了作用.
- 这一发现表明neuPABP是神经元中特定mRNA转化的一个关键调节者.
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