Abstract:
:The evolution of the group II intron in the plastid gene encoding tRNA(Val)UAC (trnV) from seven plant taxa was studied by aligning secondary and other structural features. Levels of evolutionary divergence between six angiosperms and a liverwort, Marchantia polymorpha, were compared for the six domains commonly demonstrated for group II introns and were shown to be statistically heterogeneous. Evolutionary rates varied substantially among various domains and other features. Domain II showed the highest evolutionary rate, approaching the synonymous substitution rate reported for cpDNA-encoded genes, while domain VI and the helix and loop region bearing EBS1 evolved at rates similar to those for nonsynonymous substitutions of a number of cpDNA-encoded genes. The minimum free-energy structure of domain I varied among the seven taxa, suggesting that possible protein-RNA or tertiary interactions are important for intron processing.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Learn GH Jr,Shore JS,Furnier GR,Zurawski G,Clegg MTdoi
10.1093/oxfordjournals.molbev.a040765subject
Has Abstractpub_date
1992-09-01 00:00:00pages
856-71issue
5eissn
0737-4038issn
1537-1719journal_volume
9pub_type
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