Origin and evolution of the chloroplast trnK (matK) intron:: A model for evolution of group II intron RNA structures

被引:71
作者
Hausner, G
Olson, R
Simon, D
Johnson, I
Sanders, ER
Karol, KG
McCourt, RM
Zimmerly, S
机构
[1] Univ Manitoba, Dept Microbiol, Winnipeg, MB R3T 2N2, Canada
[2] Univ Calgary, Dept Biol Sci, Calgary, AB T2N 1N4, Canada
[3] Univ Calif Los Angeles, Dept Chim Biol, David Geffen Sch Med, Los Angeles, CA USA
[4] Univ Washington, Dept Biol, Seattle, WA 98195 USA
[5] Acad Nat Sci, Dept Bot, Philadelphia, PA USA
关键词
chloroplast; group II intron; matK; maturase; trnK;
D O I
10.1093/molbev/msj047
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The trnK intron of plants encodes the matK open reading frame (ORF), which has been used extensively as a phylogenetic marker for classification of plants. Here we examined the evolution of the trnK intron itself as a model for group II intron evolution in plants. Representative trnK intron sequences were compiled from species spanning algae to angiosperms, and four introns were newly sequenced. Phylogenetic analyses showed that the matK ORFs belong to the ML (mitochondrial-like) subclass of group II intron ORFs, indicating that they were derived from a mobile group H intron of the class. RNA structures of the introns were folded and analyzed, which revealed progressive RNA structural deviations and degenerations throughout plant evolution. The data support a model in which plant organellar group II introns were derived from bacterial-like introns that had "standard" RNA structures and were competent for self-splicing and mobility and that subsequently the ribozyme structures degenerated to ultimately become dependent upon host-splicing factors. We propose that the patterns of RNA structure evolution seen for the trnK intron will apply to the other group II introns in plants.
引用
收藏
页码:380 / 391
页数:12
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