Abstract
The hypothesis of direct coding, assuming the direct contact of pairs of coding molecules with amino acid side chains in hollow unit cells (cellules) of a regular crystal-structure mineral is proposed. The coding nucleobase-containing molecules in each cellule (named “lithocodon”) partially shield each other; the remaining free space determines the stereochemical character of the filling side chain. Apatite-group minerals are considered as the most preferable for this type of coding (named “lithocoding”). A scheme of the cellule with certain stereometric parameters, providing for the isomeric selection of contacting molecules is proposed. We modelled the filling of cellules with molecules involved in direct coding, with the possibility of coding by their single combination for a group of stereochemically similar amino acids. The regular ordered arrangement of cellules enables the polymerization of amino acids and nucleobase-containing molecules in the same direction (named “lithotranslation”) preventing the shift of coding. A table of the presumed “LithoCode” (possible and optimal lithocodon assignments for abiogenically synthesized α-amino acids involved in lithocoding and lithotranslation) is proposed. The magmatic nature of the mineral, abiogenic synthesis of organic molecules and polymerization events are considered within the framework of the proposed “volcanic scenario”.
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We sincerely thank Vladimir Selivanov and Konstantin Shavkunov for providing substantial assistance in preparing the English version of this text.
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Skoblikow, N.E., Zimin, A.A. Hypothesis of Lithocoding: Origin of the Genetic Code as a “Double Jigsaw Puzzle” of Nucleobase-Containing Molecules and Amino Acids Assembled by Sequential Filling of Apatite Mineral Cellules. J Mol Evol 82, 163–172 (2016). https://doi.org/10.1007/s00239-016-9736-x
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DOI: https://doi.org/10.1007/s00239-016-9736-x