Kozak M
Department of Biological Sciences, University of Pittsburgh, Pennsylvania 15260.
J Cell Biol. 1989 Feb;108(2):229-41. doi: 10.1083/jcb.108.2.229.
The small (40S) subunit of eukaryotic ribosomes is believed to bind initially at the capped 5'-end of messenger RNA and then migrate, stopping at the first AUG codon in a favorable context for initiating translation. The first-AUG rule is not absolute, but there are rules for breaking the rule. Some anomalous observations that seemed to contradict the scanning mechanism now appear to be artifacts. A few genuine anomalies remain unexplained.
真核生物核糖体的小(40S)亚基据信最初结合在信使RNA的5'端帽状结构处,然后迁移,在一个有利于起始翻译的合适环境中遇到第一个AUG密码子便停止。首个AUG规则并非绝对,但存在打破该规则的规则。一些看似与扫描机制相矛盾的异常观察结果现在看来是人为现象。仍有一些真正的异常现象无法解释。