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2016-09-02 - Article/Dans un journal avec peer-review - Anglais - 9 page(s)

Deschoenmaeker Frédéric, Facchini Raphaël, Pino Juan Carlos Cabrera, Bayon-Vicente Guillaume , Sachdeva Neha , Flammang Patrick, Wattiez Ruddy , "Nitrogen depletion in Arthrospira sp. PCC 8005, an ultrastructural point of view" in Journal of Structural Biology, 3, 385-393

  • Edition : Elsevier, Atlanta (CA)
  • Codes CREF : Biologie (DI3100)
  • Unités de recherche UMONS : Protéomie et Microbiologie (S828)
  • Instituts UMONS : Institut des Biosciences (Biosciences)
Texte intégral :

Abstract(s) :

(Anglais) In cyanobacteria, the nitrogen and carbon metabolisms are functionally bridged and consequently respond to the carbon-to-nitrogen ratio. Consequently, a nitrogen deficiency results in carbon excess. For the first time, the biological adaptation of Arthrospira sp. PCC 8005 to nitrogen starvation has been deeply characterized at the cellular structure scale. The results indicated that the carbon excess is rerouted into carbon storage granules, such as the polyhydroxyalkanoate and glycogen granules corroborating existing data. Additionally, this photosynthetic organism hugely secreted exopolysaccharides, which could constitute another biological carbon reservoir. It has been reported that few cells in trichomes of Arthrospira sp. PCC 8005 still display a high level of fluorescence after a long-term nitrogen starvation. The transmission electron microscopy showed that some cells still contained thylakoids and phycobilisomes after this long-term nitrogen starvation, which could explain the remaining fluorescence.

Identifiants :
  • DOI : 10.1016/j.jsb.2016.08.007
  • PMID : 27592616

Mots-clés :
  • (Anglais) Glycogen
  • (Anglais) Polyhydroxyalkanoates
  • (Anglais) Nitrogen
  • (Anglais) Exopolysaccharides
  • (Anglais) Starvation
  • (Anglais) Cyanobacteria