Recreating ancient metabolic pathways before enzymes |
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Affiliation: | 1. Department of Physiology & Biophysics, University of Washington School of Medicine, Seattle, WA 98195, USA;1. Instituto de Física de Líquidos y Sistemas Biológicos, 59 Nro. 789, 1900 La Plata, Argentina;2. Universidad Tecnológica Nacional, Facultad Regional Buenos Aires, Mozart Nro. 2300, C14071VT Buenos Aires, Argentina;3. Instituto de Ingeniería y Agronomía, Universidad Nacional Arturo Jauretche, 1888 Florencio Varela, Buenos Aires, Argentina;4. Grupo de Aplicaciones Matemáticas y Estadísticas de la Facultad de Ingeniería (GAMEFI), Universidad Nacional de La Plata, Calle 115 y 48, 1900 La Plata, Argentina;1. MTA-ELTE Theoretical Biology and Evolutionary Ecology Research Group, H-1117 Pázmány Péter sétány 1/c, Budapest, Hungary;2. Eötvös Lorand University, Department of Plant Systematics, Ecology and Theoretical Biology, H-1117 Pázmány Péter sétány 1/c, Budapest, Hungary;3. Center for the Conceptual Foundations of Science, Parmenides Foundation, Kirchplatz 1,1, D-82049, Munich, Germany;2. Institute for Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark;3. Chemical and Biological Engineering, University of New Mexico, USA |
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Abstract: | The biochemistry of all living organisms uses complex, enzyme-catalyzed metabolic reaction networks. Yet, at life’s origins, enzymes had not yet evolved. Therefore, it has been postulated that non-enzymatic metabolic pathways predated their enzymatic counterparts. In this account article, we describe our recent work to evaluate whether two ancient carbon fixation pathways, the rTCA (reductive tricarboxylic acid) cycle and the reductive AcCoA (Wood-Ljungdahl) pathway, could have operated without enzymes and therefore have originated as prebiotic chemistry. We also describe the discovery of an Fe2+-promoted complex reaction network that may represent a prebiotic predecessor to the TCA and glyoxylate cycles. The collective results support the idea that most central metabolic pathways could have roots in prebiotic chemistry. |
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Keywords: | Origin of life Prebiotic chemistry Biochemistry Metabolism abiogenesis |
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