Poldermans B, Bakker H, Van Knippenberg P H
Nucleic Acids Res. 1980 Jan 11;8(1):143-51. doi: 10.1093/nar/8.1.143.
The effect of the presence or absence of the methylgroups of the m2(6)Am2(6)A sequence near the 3' end of 16S rRNA of Escherichia coli on the interaction of the ribosomal subunits has been studied, using wild-type (methylated) and mutant (unmethylated) ribosomes. Subunit exchange experiments and competitive association experiments show a strong preference of the 50S subunit for association with methylated 30S subunits. The results indicate that the equilibrium constant of the reaction 70S in equilibrium with 30S + 50S is dependent on the methylgroups; mutant 30S.50S couples are less stable than wild-type 30S.50S couples. It is postulated that the methylgroups also stimulate the interaction between 30S subunits and initiation factor IF-3.
利用野生型(甲基化)和突变型(未甲基化)核糖体,研究了大肠杆菌16S rRNA 3'端附近m2(6)Am2(6)A序列甲基基团的存在与否对核糖体亚基相互作用的影响。亚基交换实验和竞争性结合实验表明,50S亚基强烈倾向于与甲基化的30S亚基结合。结果表明,70S与30S + 50S平衡反应的平衡常数取决于甲基基团;突变型30S.50S对不如野生型30S.50S对稳定。据推测,甲基基团还刺激30S亚基与起始因子IF-3之间的相互作用。