By Erich Lück; Martin Jager. Transl. from the German by S. F. Laichena
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Additional resources for Antimicrobial food additives : characteristics, uses, effects
These findings otTer intriguing insights into the possible ways by which a simple membrane may be 'toughened' by a muscular apparatus in order for a cell to adopt an unusual and energy demanding conformation and have implications for the maintenance of cell morphology and mobility in general . Some of these aspects are considered briefly in a later chapter. 1 Glycosyl transferases The enzymes directly involved in the biosynthesis of N- and O-glycans of glycoprotein are known collectively as glycosyl transferases.
The rare h gene of the Bombay individuals either does not code for an active enzyme or one of such weak activity that subsequent modifications of the oligosaccharide are effectively blocked during normal conditions of biosynthesis. The product formed by the activity of H transferase then is recognized by the enzymes specified by the A and B genes. The transferase controlled by the A gene is a UDP-Nacetylgalactosamine: O-oc-L-fucosyl (1 -t 2) D-galactose oc-3-N· acetylgalactosaminyl transferase.
Asn. Leu. Thr . Lys . N'-acetyl Asn. Leu. Thr . Asn. Leu. Thr. Lys. Asn . Leu. Thr . IX-Lactalbumin (Asn 45 . Gln 46 . ) N'-acetyl Asn. Leu. Ser . Leu. Leu. Tyr. Asn. Leu. Thr. Ser. Val. Tyr. Asp. Leu. Thr . Ser . Val. Tyr. Gin. Leu. Thr. Ser. Val. Tyr. Asn. Leu. Val. Ser. Val. Tyr. Asn . Pro. Thr . Ser . Val. Relative activity (%) 100 473 293 120 5 I 1 100 18 <1 100 o o o o analogous peptides containing glutamine or aspartic acid in place of asparagine are completely inactive. The acceptor requirements for oligosaccharide transfer to polypeptide established by these studies are entirely consistent with the peptide sequences surrounding the glycosylated asparagine residues in glycoproteins .
Antimicrobial food additives : characteristics, uses, effects by Erich Lück; Martin Jager. Transl. from the German by S. F. Laichena