The relationship between the biosynthetic paths to the amino acids and their coding

Details The relationship between the biosynthetic paths to the amino acids and their coding The relationship between the biosynthetic paths to the amino acids and their coding

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987orli...17..401m&link_type=abstract

Origins of Life and Evolution of the Biosphere, Volume 17, Issue 3-4, pp. 401-417

Physics

3

Scientific paper

The genetic code could not have been fixed until the means for biosynthesis of the amino acids was at hand. The biosynthetic enzymes could not be optimized until the genetic code ceased to be rearranged. Therefore the development of the code and the development of the biosynthesis of the amino acids occurred concurrently. The present day biosynthetic pathways of amino acids, examined from this point of view, help to explain the present set of coded amino acids, in particular the absence of norvaline, norleucine, homoserine, ornithine, and alpha-aminobutyric acid. An order of development of biosyntheses is also proposed. Lysine was first, followed by valine and isoleucine. The more common primordial amino acids did not need biosyntheses so early. The central pathways of metabolism probably developed in response to a need for amino acid biosynthesis.

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