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Proc Natl Acad Sci U S A. 2017 Jul 11;114(28):7403-7407. doi: 10.1073/pnas.1702274114. Epub 2017 Jun 26.

Nonenzymatic gluconeogenesis-like formation of fructose 1,6-bisphosphate in ice.

Author information

1
The Molecular Biology of Metabolism Laboratory, The Francis Crick Institute, London NW1 1AT, United Kingdom.
2
Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge CB2 1GA, United Kingdom.
3
Metabolomics Science Technology Platform, The Francis Crick Institute, London NW1 1AT, United Kingdom.
4
Wellcome Trust Sanger Institute, Hinxton CB10 1SA, United Kingdom.
5
Department of Engineering, Institute for Manufacturing, University of Cambridge, Cambridge CB3 0FS, United Kingdom.
6
The Molecular Biology of Metabolism Laboratory, The Francis Crick Institute, London NW1 1AT, United Kingdom; markus.ralser@crick.ac.uk.

Abstract

The evolutionary origins of metabolism, in particular the emergence of the sugar phosphates that constitute glycolysis, the pentose phosphate pathway, and the RNA and DNA backbone, are largely unknown. In cells, a major source of glucose and the large sugar phosphates is gluconeogenesis. This ancient anabolic pathway (re-)builds carbon bonds as cleaved in glycolysis in an aldol condensation of the unstable catabolites glyceraldehyde 3-phosphate and dihydroxyacetone phosphate, forming the much more stable fructose 1,6-bisphosphate. We here report the discovery of a nonenzymatic counterpart to this reaction. The in-ice nonenzymatic aldol addition leads to the continuous accumulation of fructose 1,6-bisphosphate in a permanently frozen solution as followed over months. Moreover, the in-ice reaction is accelerated by simple amino acids, in particular glycine and lysine. Revealing that gluconeogenesis may be of nonenzymatic origin, our results shed light on how glucose anabolism could have emerged in early life forms. Furthermore, the amino acid acceleration of a key cellular anabolic reaction may indicate a link between prebiotic chemistry and the nature of the first metabolic enzymes.

KEYWORDS:

evolution; gluconeogenesis; metabolism; nonenzymatic reactions; origin of metabolism

PMID:
28652321
PMCID:
PMC5514728
DOI:
10.1073/pnas.1702274114
[Indexed for MEDLINE]
Free PMC Article

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