Abstract
Proteolysis of Pro-Gly-Pro-Leu, Pro-Gly-Pro-Gly and Pro-Gly-Pro were studied comparatively to Met-Glu-His-Phe-Pro-Gly-Pro (semax). It is shown that all three peptides are considerably more stable to proteolysis by N-leucine-aminopeptidase (EC 3.4.11.1, Sigma, type VI, 9.2 units/mg), and by enzymes of nasal slime, brain microsomal fractions, and rat blood. Metabolites of the proteolysis showed that semax derives His-Phe-Pro-Gly-Pro only, Pro-Gly-Pro-Leu forms Gly-Pro-Leu, Pro-Gly-Pro and Gly-Pro, Pro-Gly-Pro-Gly gives Pro-Gly-Pro and Gly-Pro, and Pro-Gly-Pro forms Gly-Pro.
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