Biotechnology. Atypical aminoacids IX

This paper presents the problem of the formation of the typical alpha-amino -acids. The problem is presented from the evolutionary perspective with a s pecial reference to the transitional phenomenon from M-4 (ternary basic met abolisme) to M-3 (quaternary basic metabolisme). in this field was identify ed the way from ternary ancestors To the quaternary wellknown amino acids. Are discussed three metabolic posibilityes to pass from the alpha-hidroxy-, to the alpha-amino-acids. Are also presented informational aspects of the biomolecule structures. In this respect are presented biomolecules having i nformational charge equal with zero. A special problem is the izoprenic con vergence who involves also and the valential izomerism between the methyl-p roline and dehidro-leucine groups.