title: Chemotactic tripeptides incorporating at position 2 alpha-aminoacid residues with unsaturated side chains.
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.
authors.affiliation: Dipartimento di Studi Farmaceutici, Università degli Studi di Roma La Sapienza, Rome, Italy. gino.lucente@uniroma1.it
authors.forename: G
authors.initials: G
authors.lastname: Lucente
authors.forename: M P
authors.initials: MP
authors.lastname: Paradisi
authors.forename: C
authors.initials: C
authors.lastname: Giordano
authors.forename: A
authors.initials: A
authors.lastname: Sansone
authors.forename: D
authors.initials: D
authors.lastname: Torino
authors.forename: S
authors.initials: S
authors.lastname: Spisani
mesh_terms: D000498:Allyl Compounds / Q000737:chemistry*; D000501:Allylglycine / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D002630:Chemotactic Factors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D003517:Cyclopentanes / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008968:Molecular Conformation; D009113:Muramidase / Q000737:chemistry / Q000378:metabolism; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects*; D017510:Protein Folding; D013481:Superoxides / Q000737:chemistry / Q000378:metabolism
chemical_list: C532134:1-aminocyclopent-3-ene-1-carboxylic acid; D000498:Allyl Compounds; D002264:Carboxylic Acids; D002630:Chemotactic Factors; D003517:Cyclopentanes; C426410:diallylglycine; D000501:Allylglycine; D013481:Superoxides; D009240:N-Formylmethionine Leucyl-Phenylalanine; D009113:Muramidase; D005998:Glycine