Abstract
The ‘energy-rich’ thioester, N-acetyl-S-lactoylcysteine, is formed from low concentrations of glyceraldehyde and N-acetylcysteine under anaerobic conditions at ambient temperature in aqueous solutions of sodium phosphate (pH 7.0). Reactions with 2 mM glyceraldehyde, 2 mM N-acetylcysteine, and 500 mM sodium phosphate (pH 7.0) convert about 0.3%/day of the glyceraldehyde to lactoyl thioester. The formation of lactoyl thioester in similar reactions with 500 mM imidazole hydrochloride (pH 7.0) is supported by the thiol-dependence of lactate formation, which is 3-fold greater in the presence of thiol (0.11%/day) than in the absence of thiol (0.04%/day). The formation of lactoyl thioester is thought to proceed by the phosphate (or imidazole)-catalyzed dehydration of glyceraldehyde to give pyruvaldehyde, which adds to the thiol to form a hemithioacetal that rearranges to the thioester. A limited amount of a second thioester, N-acetyl-S-glyceroyl-cysteine, is also formed at the beginning of these reactions. The significance of these reactions to the origin of life is discussed.
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Weber, A.L. Prebiotic formation of ‘energy-rich’ thioesters from glyceraldehyde and N-acetylcysteine. Origins Life Evol Biosphere 15, 17–27 (1984). https://doi.org/10.1007/BF01809390
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DOI: https://doi.org/10.1007/BF01809390