Requirement for Mesorhizobium loti ornithine transcarbamoylase for successful symbiosis with Lotus japonicus as revealed by an unexpected long-range genome deletion

Plant & Cell Physiology
Elina MishimaKazuhiko Saeki

Abstract

With the original aim of surveying the role of exopolysaccharide (EPS) in Lotus-Mesorhizobium symbiosis, we carried out Tn5 mutagenesis of Mesorhizobium loti and obtained 32 mutants with defects in EPS biosynthesis. One of the mutants, HIA22, formed pseudonodules and failed to fix nitrogen with Lotus japonicus. However, complementation analysis unexpectedly revealed that the potential gene with the locus tag, mll2073, interrupted by Tn5 was responsible for neither normal EPS synthesis nor symbiosis. Further analysis uncovered that HIA22 had a genome deletion of approximately 20 kbp, resulting in the loss of two separate genes responsible for EPS biosynthesis and symbiosis. One gene with the locus tag, mll5669, was needed to synthesize normal EPS that fluoresced on medium containing Calcofluor and encoded a homolog of O-antigen acetyl transferase in Salmonella typhimurium. A specific mutant of mll5669, EMB-B58, successfully fixed nitrogen when infected onto L. japonicus. Another gene, mlr5647, was needed to establish fully functional nodules and encoded ornithine carbamoyl transferase [ArgF (EC 2.1.3.3)], which participates in arginine biosynthesis. A specific mutant of mlr5647, EMB-Y2, showed arginine auxotrophy and formed infe...Continue Reading

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Citations

Mar 8, 2014·Critical Reviews in Microbiology·Michael Frederick Dunn
Dec 23, 2014·Chembiochem : a European Journal of Chemical Biology·Zerrin UzumChristian Hertweck
Jul 26, 2017·Amino Acids·Vijay Joshi, Alisdair R Fernie
Sep 28, 2018·Frontiers in Microbiology·María J LoriteMilagros León-Barrios
Jul 3, 2021·International Journal of Molecular Sciences·Sebastián Acosta-JuradoJosé-María Vinardell

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