title: Analyses of Old "Prokaryotic" Proteins Indicate Functional Diversification in Arabidopsis and Oryza sativa.
abstract: During evolution, various processes such as duplication, divergence, recombination, and many other events leads to the evolution of new genes with novel functions. These evolutionary events, thus significantly impact the evolution of cellular, physiological, morphological, and other phenotypic trait of organisms. While evolving, eukaryotes have acquired large number of genes from the earlier prokaryotes. This work is focused upon identification of old "prokaryotic" proteins in Arabidopsis and Oryza sativa genome, further highlighting their possible role(s) in the two genomes. Our results suggest that with respect to their genome size, the fraction of old "prokaryotic" proteins is higher in Arabidopsis than in Oryza sativa. The large fractions of such proteins encoding genes were found to be localized in various endo-symbiotic organelles. The domain architecture of the old "prokaryotic" proteins revealed similar distribution in both Arabidopsis and Oryza sativa genomes showing their conserved evolution. In Oryza sativa, the old "prokaryotic" proteins were more involved in developmental processes, might be due to constant man-made selection pressure for better agronomic traits/productivity. While in Arabidopsis, these proteins were involved in metabolic functions. Overall, the analysis indicates the distinct pattern of evolution of old "prokaryotic" proteins in Arabidopsis and Oryza sativa.
authors.affiliation: School of Computational and Integrative Sciences, Jawaharlal Nehru University New Delhi, India.
authors.forename: Anupama
authors.initials: A
authors.lastname: Singh
authors.affiliation: International Center for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Minesh
authors.initials: M
authors.lastname: Jethva
authors.affiliation: Plant Stress Biology, International Center for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Sneh L
authors.initials: SL
authors.lastname: Singla-Pareek
authors.affiliation: Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University New Delhi, India.
authors.forename: Ashwani
authors.initials: A
authors.lastname: Pareek
authors.affiliation: International Center for Genetic Engineering and Biotechnology New Delhi, India.
authors.forename: Hemant R
authors.initials: HR
authors.lastname: Kushwaha
keywords: Arabidopsis; Oryza sativa; domain; evolution; old “prokaryotic” proteins