Abstract
Synthetic heptapeptides containing D-amino acid residues and differing in the content of L-phenylalanine and L-tyrosine residues and their position (Val-D-Leu-Pro-Tyr-Phe-Val-D-Leu, Val-D-Leu-Pro-Tyr-Tyr-Val-D-Leu, Val-D-Leu-Pro-Phe-Tyr-Val-D-Leu) were immobilized to two types of carriers: glyoxal-activated magnetic agarose particles and CNBr-activated Sepharose. In both cases, peptides were immobilized via their terminal amino group. Immobilized peptides were used for the study of binding properties of two gastric aspartic proteases (porcine pepsin A and rat pepsin C). Porcine pepsin A was adsorbed to all studied peptide-modified magnetic carriers, while rat pepsin C interacted with immobilized ligands only slightly. Similar results were obtained in affinity chromatographic experiments using heptapeptides immobilized to Sepharose.
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