title: Synthesis and spectroscopic studies on the new Schiff base derived from the 1:2 condensation of 2,6-diformyl-4-methylphenol with 5-aminouracil (BDF5AU) and its transition metal complexes. Influence on biologically active peptides-regulating aminopeptidases.
abstract: The synthesis, spectroscopic (IR, 1H and 13C NMR, UV-Vis-NIR, EPR), magnetic measurements and biological studies of a number of complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Au(III) and Hg(II) of the Schiff base derived from the 1:2 condensation of 2,6-diformyl-4-methylphenol and 5-aminouracil, ((5-[[(3-[[(2,4-dioxopyrimidin-5(1H,3H)-yl)imino]methyl]-2-hydroxy-5-methylphenyl)methylene]amino]pyrimidine-2,4(1H,3H)-dione, hereafter denoted as BDF5AU) are reported. In all cases, the complexes appear to be monomeric. The deprotonated ligand in the phenolic oxygen atom shows a tridentate coordination mode through the two azomethine nitrogen atoms and the phenolic oxygen atom. The coordination of the neutral ligand takes place through the phenolic oxygen atom and one azomethine nitrogen atom and the carbonylic oxygen atom in fourth position of one uracil ring. The biological properties of some perchlorate complexes on the activity of some neutral, acid, basic and omega aminopeptidases (AP) are assayed, demonstrating a general inhibitory effect. Neutral and basic AP are mainly inhibited by Cu(II), Ni(II) and Cd(II) complexes, although tyrosyl-AP is activated by Zn(II) complex. Glutamyl-AP but not aspartyl-AP is inhibited by all the complexes assayed excepting Zn(II) complex. Finally, omega AP is inhibited by Ni(II) and Cd(II) complexes.
authors.affiliation: Departamento de Química Inorgánica y Orgánica, Campus Las Lagunillas B3, Universidad de Jaén, 23071 Jaén, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Hueso-Ureña
authors.forename: Nuria A
authors.initials: NA
authors.lastname: Illán-Cabeza
authors.forename: Miguel N
authors.initials: MN
authors.lastname: Moreno-Carretero
authors.forename: José M
authors.initials: JM
authors.lastname: Martínez-Martos
authors.forename: María J
authors.initials: MJ
authors.lastname: Ramírez-Expósito
mesh_terms: D000626:Aminopeptidases / Q000037:antagonists & inhibitors / Q000097:blood*; D000704:Analysis of Variance; D000818:Animals; D003408:Cresols / Q000737:chemistry* / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005566:Formocresols / Q000737:chemistry* / Q000494:pharmacology; D006868:Hydrolysis; D008024:Ligands; D008297:Male; D019216:Metals, Heavy / Q000737:chemistry* / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D010472:Perchlorates / Q000737:chemistry / Q000494:pharmacology; D012545:Schiff Bases / Q000737:chemistry* / Q000494:pharmacology; D017670:Sodium Compounds / Q000737:chemistry / Q000494:pharmacology; D013057:Spectrum Analysis; D014498:Uracil / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000494:pharmacology
chemical_list: C474508:2,6-diformyl-4-methylphenol; D003408:Cresols; D004791:Enzyme Inhibitors; D005566:Formocresols; D008024:Ligands; D019216:Metals, Heavy; D010472:Perchlorates; D012545:Schiff Bases; D017670:Sodium Compounds; D014498:Uracil; C031068:sodium perchlorate; D000626:Aminopeptidases; C011166:5-aminouracil