Molecular evolution of glutamine synthetase II: Phylogenetic evidence of a non-endosymbiotic gene transfer event early in plant evolution
2010
Background
Glutamine synthetase(GS) is essential for ammonium assimilation and the biosynthesis of
glutamine. The three GS
gene families(GSI, GSII, and GSIII) are represented in both
prokaryoticand
eukaryoticorganisms. In this study, we examined the evolutionary relationship of GSII from eubacterial and
eukaryoticlineages and present robust phylogenetic evidence that GSII was transferred from γ-
Proteobacteria(Eubacteria) to the Chloroplastida.
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