Life on arginine for Mycoplasma hominis: clues from its minimal genome and comparison with other human urogenital mycoplasmas. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue PLoS Genetics Année : 2009

Life on arginine for Mycoplasma hominis: clues from its minimal genome and comparison with other human urogenital mycoplasmas.

Sabine Pereyre
  • Fonction : Auteur
Laure Beven
Alain Charron
  • Fonction : Auteur
Hélène Renaudin
  • Fonction : Auteur
Aurélien Barré
Philippe Avenaud
  • Fonction : Auteur
Daniel Jacob
Valérie Barbe

Résumé

Mycoplasma hominis is an opportunistic human mycoplasma. Two other pathogenic human species, M. genitalium and Ureaplasma parvum, reside within the same natural niche as M. hominis: the urogenital tract. These three species have overlapping, but distinct, pathogenic roles. They have minimal genomes and, thus, reduced metabolic capabilities characterized by distinct energy-generating pathways. Analysis of the M. hominis PG21 genome sequence revealed that it is the second smallest genome among self-replicating free living organisms (665,445 bp, 537 coding sequences (CDSs)). Five clusters of genes were predicted to have undergone horizontal gene transfer (HGT) between M. hominis and the phylogenetically distant U. parvum species. We reconstructed M. hominis metabolic pathways from the predicted genes, with particular emphasis on energy-generating pathways. The Embden-Meyerhoff-Parnas pathway was incomplete, with a single enzyme absent. We identified the three proteins constituting the arginine dihydrolase pathway. This pathway was found essential to promote growth in vivo. The predicted presence of dimethylarginine dimethylaminohydrolase suggested that arginine catabolism is more complex than initially described. This enzyme may have been acquired by HGT from non-mollicute bacteria. Comparison of the three minimal mollicute genomes showed that 247 CDSs were common to all three genomes, whereas 220 CDSs were specific to M. hominis, 172 CDSs were specific to M. genitalium, and 280 CDSs were specific to U. parvum. Within these species-specific genes, two major sets of genes could be identified: one including genes involved in various energy-generating pathways, depending on the energy source used (glucose, urea, or arginine) and another involved in cytadherence and virulence. Therefore, a minimal mycoplasma cell, not including cytadherence and virulence-related genes, could be envisaged containing a core genome (247 genes), plus a set of genes required for providing energy. For M. hominis, this set would include 247+9 genes, resulting in a theoretical minimal genome of 256 genes.
Fichier principal
Vignette du fichier
2009_Pereyre_Journal-pgen_1.pdf (460.77 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00645937 , version 1 (31-05-2020)

Identifiants

Citer

Sabine Pereyre, Pascal Sirand-Pugnet, Laure Beven, Alain Charron, Hélène Renaudin, et al.. Life on arginine for Mycoplasma hominis: clues from its minimal genome and comparison with other human urogenital mycoplasmas.. PLoS Genetics, 2009, 5 (10), pp.e1000677. ⟨10.1371/journal.pgen.1000677⟩. ⟨hal-00645937⟩
313 Consultations
114 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More