不同的LARP1 PAM2图案采用了对MLLE结合的非正规形态
Ali Behvarmanesh1, Guennadi Kozlov1, Tara Sprules2
1Department of Biochemistry, McGill University, Montréal, Québec, H3G 0B1, Canada; Centre de Recherche en Biologie Structurale, McGill University, Montréal, Québec, H3G 0B1, Canada.
Biochemical and biophysical research communications
|February 28, 2026
概括
细胞质多A结合蛋白1 (PABPC1) 与La相关蛋白1 (LARP1) 通过非正规的动机相互作用. 这揭示了PABPC1如何使用的灵活性.
科学领域:
- 分子生物学分子生物学
- 蛋白相互作用 蛋白相互作用
- 在RNA代谢过程中.
背景情况:
- 细胞质多A结合蛋白1 (PABPC1) 通过RNA识别基因 (RRMs) 结合mRNA多A尾部.
- PABPC1的C端MLLE域招募含有PAM2基因的调节蛋白.
- 与La相关的蛋白1 (LARP1) 与PABPC1相互作用,但具有非典型的PAM2序列.
研究的目的:
- 阐明LARP1的PAM2动机与PABPC1的MLLE域之间的相互作用的分子基础.
- 描述涉及LARP1.1的非正规PAM2-MLLE相互作用.
主要方法:
- 核磁共振 (NMR) 光谱学 核磁共振 (NMR) 光谱学
- 异热定位热量计 (ITC) 是一种热量计.
- AlphaFold3 蛋白质结构建模模型
主要成果:
- 核磁共振确定了LARP1内负责MLLE结合的特定PAM2动图段.
- 突变和ITC证实Phenylalanine 496对于MLLE相互作用至关重要.
- AlphaFold3预测了LARP1 PAM2动机中的单转α螺旋.
结论:
- 定义了LARP1和PABPC1的MLLE域之间的非正规相互作用.
- 该研究强调了MLLE域识别PAM2图案的可塑性.
- 这些发现提升了对LARP蛋白质对mRNA代谢调节的理解.
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