Cycle de Krebs inverse

(de) Cycle de Krebs inverse.

Le cycle de Krebs inverse est une voie métabolique cyclique par laquelle certaines bactéries fixent le dioxyde de carbone CO2 et l'eau H2O sous forme d'acétyl-CoA en utilisant l'hydrogène H2, l'ion sulfure S2− ou encore l'ion thiosulfate S2O32− comme donneurs d'électrons[1],[2], selon un mécanisme reprenant le cycle de Krebs en sens inverse pour constituer une alternative marginale au cycle de Calvin. Les principales étapes de ce cycle sont les suivantes :

Ce cycle de réactions pourrait avoir joué un rôle dans l'apparition de la vie sur Terre en offrant une voie anabolique chimiotrophe alternative à la phototrophie, certaines de ses étapes pouvant être catalysées par des minéraux[3].

Notes et références

  1. ↑ (en) M. C. W. Evans, Bob B. Buchanan et Daniel I. Arnon, « A new ferredoxin-dependent carbon reduction cycle in a photosynthetic bacterium », Proceeding of the National Academy of Sciences of the United States of America, vol. 55, no 4,‎ , p. 928-934 (lire en ligne)
    DOI 10.1073/pnas.55.4.928 PMID 5219700
  2. ↑ (en) Bob B. Buchanan et Daniel I. Arnon, « A reverse Krebs cycle in photosynthesis: consensus at last », Photosynthesis Research, vol. 24, no 1,‎ , p. 47-53 (lire en ligne)
    DOI 10.1007/BF00032643 PMID 11540925
  3. ↑ (en) Xiang V. Zhang et Scot T. Martin, « Driving Parts of Krebs Cycle in Reverse through Mineral Photochemistry », Journal of the American Chemical Society, vol. 128, no 50,‎ , p. 16032-16033 (lire en ligne)
    DOI 10.1021/ja066103k PMID 17165745

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