• the role of carbohydrates at the origin of homochirality in biosystems

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     pasteur has demonstrated that the chiral components in a racemic mixture can separate in homochiral crystals. but with a strong chiral discrimination the chiral components in a concentrated mixture can also phase separate into homochiral fluid domains, and the isomerization kinetics can then perform a symmetry breaking into one thermodynamical stable homochiral system. glyceraldehyde has a sufficient chiral discrimination to perform such a symmetry breaking. the requirement of a high concentration of the chiral reactant(s) in an aqueous solution in order to perform and maintain homochirality; the appearance of phosphorylation of almost all carbohydrates in the central machinery of life; the basic ideas that the biochemistry and the glycolysis and gluconeogenesis contain the trace of the biochemical evolution, all point in the direction of that homochirality was obtained just after- or at a phosphorylation of the very first products of the formose reaction, at high concentrations of the reactants in phosphate rich compartments in submarine hydrothermal vents. a racemic solution of d,l-glyceraldehyde-3-phosphate could be the template for obtaining homochiral d-glyceraldehyde-3-phosphate(aq) as well as l-amino acids.

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