Constraints on the evolution of plastid introns: the group II intron in the gene encoding tRNA-Val(UAC).

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 Evol

authors

Learn GH Jr,Shore JS,Furnier GR,Zurawski G,Clegg MT

doi

10.1093/oxfordjournals.molbev.a040765

subject

Has Abstract

pub_date

1992-09-01 00:00:00

pages

856-71

issue

5

eissn

0737-4038

issn

1537-1719

journal_volume

9

pub_type

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