Add time:09/07/2019         Source:sciencedirect.com

Publisher SummaryThis chapter discusses different types of amino acids. Monoaminomonocarboxylic acids require no special preparative methods. Peptides containing glycine, alanine, valine, leucine, isoleucine, or phenylalanine and peptides composed of only one of these amino acids have been frequently described. In basic amino acids, all known biologically active polypeptides contain multifunctional amino acids. Such additional functional groups pose special problems for the synthesis of peptides and make necessary a detailed discussion of the amino acids in question. The glutamic acid is very widely distributed in animals, plants, and bacteria. It is incorporated in proteins and peptides most commonly via an α-peptide bond, while the γ-carboxyl group is free or is present as amide. Glutamyl α- or γ-peptides can be prepared from intramolecular cyclic derivatives of glutamic acid and from derivatives of N-protected glutamic acid monosubstituted at α- or γ-carboxyl group.

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