自然的人类tRNAAla抗变异错误翻译了遗传密码
Rasangi Tennakoon1, Teija M I Bily1, Farah Hasan1
1Department of Biochemistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada.
概括
罕见的人类转移RNA (tRNA) 变体与抗突变导致错误翻译. 这些tRNA变体在蛋白质合成过程中导致氨基酸的错误结合,影响蛋白质的生产.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 转移RNAs (tRNAs) 对于蛋白质合成至关重要,它们翻译遗传密码.
- 人类基因组含有400多个tRNA基因,具有种群级单核酸多态,包括抗变异.
- 抗的变种可以导致错误翻译,改变蛋白质序列.
研究的目的:
- 为了研究自然存在的人类氨酸tRNA (tRNAAla) 抗变体的功能影响.
- 为了确定这些tRNAAla变异是否会导致非同类编码子的氨酸错误结合.
- 评估这种错误翻译对蛋白质生产和细胞生长的影响.
主要方法:
- 鉴定了三种罕见的人类tRNAAla变体与抗突变.
- 这些变异在人类细胞中的表达.
- 质谱测量以量化氨基酸错误结合.
- 分析蛋白质生产和细胞生长缺陷.
主要成果:
- tRNAAla变体的表达导致了氨酸在谷氨酸 (0.7%),氨酸 (5%) 和三氨酸 (0.1%) 代码的错误整合.
- 尽管氨酸编码子的错误融合较高,但氨酸编码子的错误融合导致了最严重的蛋白质生产缺陷.
- 细胞生长没有受到这些变体表达的重大影响.
结论:
- 自然的人类tRNAAla变体可以诱导错误翻译.
- 蛋白质生产缺陷的严重程度取决于特定的氨基酸被错误纳入.
- 在tRNA中的Anticodon突变代表了影响蛋白质合成忠实性的遗传变异来源.
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