叶绿体内含子的细菌起源：蓝细菌中保守的自我剪接I组内含子

Bacterial origin of a chloroplast intron: conserved self-splicing group I introns in cyanobacteria.

作者信息

Xu M Q, Kathe S D, Goodrich-Blair H, Nierzwicki-Bauer S A, Shub D A

机构信息

Department of Biological Sciences, State University of New York, Albany 12222.

出版信息

Science. 1990 Dec 14;250(4987):1566-70. doi: 10.1126/science.2125747.

DOI:10.1126/science.2125747

PMID:2125747

Abstract

A self-splicing group I intron has been found in the gene for a leucine transfer RNA in two species of Anabaena, a filamentous nitrogen-fixing cyanobacterium. The intron is similar to one that is found at the identical position in the same transfer RNA gene of chloroplasts of land plants. Because cyanobacteria were the progenitors of chloroplasts, it is likely that group I introns predated the endosymbiotic association of these eubacteria with eukaryotic cells.

摘要

在丝状固氮蓝细菌鱼腥藻的两个物种中，亮氨酸转运RNA基因里发现了一种自我剪接的I类内含子。该内含子与在陆地植物叶绿体相同转运RNA基因的相同位置发现的内含子相似。由于蓝细菌是叶绿体的祖先，I类内含子很可能在这些真细菌与真核细胞的内共生联系之前就已存在。