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[Phosphorylation of D-and L-amino-acids by the ileal mucosa in relation with calcium absorption (author's transl)].

L-amino-acids and D-amino-acids were compared firstly for their effects on calcium absorption in ileal loops, and secondly for their ability to be phosphorylated with an ileal mucosa extract. Some molecules, such as D- and L-lysine, D and L-ornithine which are highly effective in enhancing calcium absorption, were also phosphorylable. In contrast, other molecules, such as, D- and L-norleucine, D- and L-valine, are ineffective and are also not phosphorylable. Transphosphorylation rate from ATP of both D- and L-lysine was found to be pH dependent, with a maximum at pH 8.5; at pH 10, no phosphorylation was observed. Among various nucleotides tested (ATP, CTP, GTP, ITP, UTP) which act as phosphate donors, only ATP was able to induce formation of the phosphorylated compounds with D- and L-lysine at pH 8.5.