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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The biosynthetic route from ornithine to proline.

It is shown by tracer experiments with DL-[2-3H,5-14C]- and DL-[(RS)-5-3H,5-14C]rnithine, that the metabolic conversion of ornithine into proline, in three plant species (Nicotiana tabacum, Datura stramonium, and Lupinus angustifolius), takes place with maintenance of the delta-hydrogen atoms but with loss of the alpha-hydrogen atom. This indicates a route via alpha-keto-delta-aminovaleric acid (5-amino-2-oxopentanoic acid) and disproves the accepted route via glutamic gamma-semialdehyde (2-amino-5-oxopentanoic acid).[1]


  1. The biosynthetic route from ornithine to proline. Mestichelli, L.J., Gupta, R.N., Spenser, I.D. J. Biol. Chem. (1979) [Pubmed]
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