PMID: 6163629Feb 1, 1981Paper

Synthesis and biological properties of enzyme-resistant analogues of substance P

European Journal of Biochemistry
B E SandbergL L Iversen

Abstract

Six analogues of substance P were synthesized with the aim of developing a metabolically stable peptide that would retain the biological activity of substance P. A recently isolated and characterized substance-P-degrading enzyme from human brain with a high specificity for substance P described in the preceding paper in this journal was used as a model for the enzymatic inactivation of substance P. The synthetic analogues were designed to protect the peptide bonds on the carboxyl side of residues 6, 7 and 8 of substance P, which represent the sites of cleavage by substance-P-degrading enzyme. To test for increased enzymatic resistance, the analogues were incubated with the enzyme, the digests were separated on a high-performance liquid chromatography reverse-phase column and the peptide fragments were collected and identified by amino acid analysis. Of the analogues described, an heptapeptide analogue of residues 5-11, less than Glu-Gln-Phe-MePhe-MeGly-Leu-MetNH2, showed almost complete resistance both towards substance-P-degrading enzyme and to degradation on exposure to rat hypothalamic slices. This analogue was about a third as potent as substance P in competing for binding to receptor sites for this peptide in rat brain mem...Continue Reading

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May 1, 1991·Biopolymers·D Regoli, F Nantel
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