Evidence for a Unique DNA-Dependent RNA Polymerase in Cereal Crops.

ABSTRACT: Gene duplication is an important driver for the evolution of new genes and protein functions. Duplication of DNA-dependent RNA polymerase (Pol) II subunits within plants led to the emergence of RNA Pol IV and V complexes, each of which possess unique functions necessary for RNA-directed DNA Methylation. Comprehensive identification of Pol V subunit orthologs across the monocot radiation revealed a duplication of the largest two subunits within the grasses (Poaceae), including critical cereal crops. These paralogous Pol subunits display sequence conservation within catalytic domains, but their carboxy terminal domains differ in length and character of the Ago-binding platform, suggesting unique functional interactions. Phylogenetic analysis of the catalytic region indicates positive selecti

SUBMITTER: Trujillo JT 

PROVIDER: S-EPMC6188566 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature