« Ménage à trois » pour la production de peptidoglycanes !

« Ménage à trois » pour la production de peptidoglycanes !

Le peptidoglycane est un composant caractéristique de la paroi bactérienne impliqué dans la division et assurant le maintien de l’intégrité cellulaire. La cochenille farineuse du citronnier, Planococcus citri, est bien connue pour héberger une structure endosymbiotique imbriquée de bactéries : la bactérie Moranella endobia (Moranella) vit dans le cytoplasme d’une autre bactérie Tremblaya princeps (Tremblaya). Il vient d’être démontré l’existence d’un transfert horizontal de gènes ayant permis à la cochenille d’acquérir certains gènes de Moranella. En effet, une protéine de la colchenille prouvée d’origine bactérienne en provenance des Moranella permet de produire une couche de peptidoglycane exclusivement autour des Moranella incluses dans les Tremblaya. Une véritable symbiose entre ces trois-là !

Pour plus d’informations : https://www.sciencedirect.com/science/article/pii/S0092867419310050

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