Abstract
New N-For-Met-Leu-Phe-OMe (fMLF-OMe) analogues incorporating three different gamma-delta-didehydro-alpha-aminoacid residues (namely: Alg = (S)-Allylglycine; Dag = Diallylglycine; Cpg = 1-Aminocyclopent-3-ene-1-carboxylic acid) replacing the native (S)-Leucine have been synthesized and their activity towards human neutrophils has been evaluated in comparison with that shown by the reference tripeptide fMLF-OMe. Chemotaxis, lysozyme release and superoxide anion production have been measured. (1)H NMR titration experiments and NOESY spectrum of the Cpg containing model 10 have been discussed in order to ascertain the preferred solution conformations. A fully extended (C(5)) conformation at position 2 and a folded conformation with two consecutive gamma-turns (C(7) structure) have been proposed for the Dag and Cpg containing tripeptides, respectively.
MeSH terms
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Allyl Compounds / chemistry*
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Allylglycine / chemistry*
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Carboxylic Acids / chemistry*
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Chemotactic Factors / chemical synthesis
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Chemotactic Factors / chemistry
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Chemotactic Factors / pharmacology*
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Cyclopentanes / chemistry*
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Glycine / analogs & derivatives*
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Glycine / chemistry
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Humans
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Magnetic Resonance Spectroscopy / methods
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Molecular Conformation
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Muramidase / chemistry
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Muramidase / metabolism
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N-Formylmethionine Leucyl-Phenylalanine / analogs & derivatives*
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N-Formylmethionine Leucyl-Phenylalanine / chemical synthesis
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N-Formylmethionine Leucyl-Phenylalanine / pharmacology*
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Neutrophils / drug effects*
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Protein Folding
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Superoxides / chemistry
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Superoxides / metabolism
Substances
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1-aminocyclopent-3-ene-1-carboxylic acid
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Allyl Compounds
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Carboxylic Acids
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Chemotactic Factors
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Cyclopentanes
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diallylglycine
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Allylglycine
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Superoxides
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N-Formylmethionine Leucyl-Phenylalanine
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Muramidase
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Glycine