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Lysinoalanine in Food and in Antimicrobial Proteins

  • Mendel Friedman
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 459)

Abstract

Heat and alkali treatment of food proteins widely used in food processing results in the formation of crosslinked amino acids such as lysinoalanine, ornithinoalanine, lanthionine, and methyl-lanthionine and concurrent racemization of L-amino acid isomers to D-ana-logues. The mechanism of lysinoalanine formation is a two-step process: first, hydroxide ion-catalyzed elimination of cysteine and serine residues to a dehydroalanine intermediate; second, reaction of the double bond of dehydroalanine with the ∈-NH2 group of lysine to form a lysinoalanine crosslink. The corresponding elimination-addition reaction of threonine produces methyl-dehydroalanine, which then reacts with the NH2 and SH groups to form methyl-lysinoalanine and methyl-lanthionine, respectively. The crosslinked amino acids lanthionine and methyl-lanthionine are formed by analogous nucleophilic addition reactions of the S H group of cysteine to dehydroalanine and methyl-dehydroalanine, respectively. Processing conditions that favor these transformations include high pH, temperature and exposure time. Factors which minimize lysinoalanine formation include the presence of SH-containing amino acids such as cysteine, N-acetyl-cysteine, and glutathione, dephosphorylation of O-phosphoryl esters, and acylation of ∈-NH2 groups of lysine side chains. The presence of lysinoalanine residues along a protein chain decreases digestibility and nutritional quality in rodents but enhances nutritional quality in ruminants. Protein-bound and free lysinoalanines are reported to induce enlargement of nuclei of rat kidney cells. All of the mentioned dehydro and crosslinked amino acids also occur naturally in certain peptide and protein antibiotics. These include duramycin, cinnamycin, epidermin, subtil in and the widely used food preservative nisin. Mechanistic rationalizations are offered for the observed antimicrobial activities of these compounds in relation to their structures. The cited findings and new research to better define the chemistry and dietary and antimi-crobial roles of lysinoalanine and related compounds should lead to better and safer foods.

Keywords

Soybean Protein Sodium Caseinate Antimicrobial Protein Sodium Sulfite Lysine Side Chain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Mendel Friedman
    • 1
  1. 1.Western Regional Research Center Agricultural Research ServiceU.S. Department of AgricultureAlbanyUSA

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