Evolutionary insights about bacterial GlxRS from whole genome analyses: is GluRS2 a chimera?

Abstract:

BACKGROUND:Evolutionary histories of glutamyl-tRNA synthetase (GluRS) and glutaminyl-tRNA synthetase (GlnRS) in bacteria are convoluted. After the divergence of eubacteria and eukarya, bacterial GluRS glutamylated both tRNAGln and tRNAGlu until GlnRS appeared by horizontal gene transfer (HGT) from eukaryotes or a duplicate copy of GluRS (GluRS2) that only glutamylates tRNAGln appeared. The current understanding is based on limited sequence data and not always compatible with available experimental results. In particular, the origin of GluRS2 is poorly understood. RESULTS:A large database of bacterial GluRS, GlnRS, tRNAGln and the trimeric aminoacyl-tRNA-dependent amidotransferase (gatCAB), constructed from whole genomes by functionally annotating and classifying these enzymes according to their mutual presence and absence in the genome, was analyzed. Phylogenetic analyses showed that the catalytic and the anticodon-binding domains of functional GluRS2 (as in Helicobacter pylori) were independently acquired from evolutionarily distant hosts by HGT. Non-functional GluRS2 (as in Thermotoga maritima), on the other hand, was found to contain an anticodon-binding domain appended to a gene-duplicated catalytic domain. Several genomes were found to possess both GluRS2 and GlnRS, even though they share the common function of aminoacylating tRNAGln. GlnRS was widely distributed among bacterial phyla and although phylogenetic analyses confirmed the origin of most bacterial GlnRS to be through a single HGT from eukarya, many GlnRS sequences also appeared with evolutionarily distant phyla in phylogenetic tree. A GlnRS pseudogene could be identified in Sorangium cellulosum. CONCLUSIONS:Our analysis broadens the current understanding of bacterial GlxRS evolution and highlights the idiosyncratic evolution of GluRS2. Specifically we show that: i) GluRS2 is a chimera of mismatching catalytic and anticodon-binding domains, ii) the appearance of GlnRS and GluRS2 in a single bacterial genome indicating that the evolutionary histories of the two enzymes are distinct, iii) GlnRS is more widespread in bacteria than is believed, iv) bacterial GlnRS appeared both by HGT from eukarya and intra-bacterial HGT, v) presence of GlnRS pseudogene shows that many bacteria could not retain the newly acquired eukaryal GlnRS. The functional annotation of GluRS, without recourse to experiments, performed in this work, demonstrates the inherent and unique advantages of using whole genome over isolated sequence databases.

journal_name

BMC Evol Biol

journal_title

BMC evolutionary biology

authors

Dasgupta S,Basu G

doi

10.1186/1471-2148-14-26

subject

Has Abstract

pub_date

2014-02-12 00:00:00

pages

26

issn

1471-2148

pii

1471-2148-14-26

journal_volume

14

pub_type

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