Search results for "Alanine derivative"

showing 4 items of 4 documents

Conformational investigation of α, β‐dehydropeptides. XI. Molecular and crystal structure of Ac‐(Z )‐ΔPhe‐NMe2 as compared to those of related molecu…

2003

A series of three homologous dimethyldiamides Ac-(Z)-ΔPhe-NMe2, Ac-L-Phe-NMe2 and Ac-DL-Phe-NMe2 have been synthesized and their structures determined from single-crystal X-ray diffraction data. To learn more about the conformational preferences of the compounds studied, the fully relaxed ϕ, ψ conformational energy maps on the free molecules of Ac-ΔAla-NMe2 and Ac-(Z)-ΔPhe-NMe2 were obtained with the HF/3-21G method and the calculated minima re-optimized with the DFT/B3LYP/6-31G** method. The crystal state results have been compared with the literature data. The studied dimethyldiamide Ac-ΔXaa-NMe2 combines the double bond in positions α, β and the C-terminal tertiary amide within one molec…

Double bondphenylalanine derivativesStereochemistryαdimethylamidesCrystal structureX‐ray crystallographyBiochemistryβ‐dehydro amino acidschemistry.chemical_compoundStructural BiologyAb initio quantum chemistry methodsAmideDrug Discovery(Z )‐dehydrophenylalanine derivativePeptide bondMoleculeMolecular BiologyConformational isomerismPharmacologychemistry.chemical_classificationab initio calculationsOrganic Chemistryamino acid amidesGeneral MedicineCrystallographydehydropeptideschemistryMolecular MedicineRamachandran plotJournal of Peptide Science
researchProduct

Conformational properties of N-acetyl-L-alanine N',N'-dimethylamide

2004

Ab initio/DFT analysis of the conformational properties of free Ac-Ala-NMe(2) (N-acetyl-L-alanine-N',N'-dimethylamide) in terms of the N-H.O, N-H.N, C-H.O hydrogen bonds and C(delta+) = O(delta-) dipole attractions was performed. The Ala residue combined with the C-terminal tertiary amide prefers an extended conformation and that characteristic of the (i + 1)th position of the betaVIb turn. These can be easily remodelled into a structure compatible with the (i + 1)th position of the betaII/betaVIa turn. The residue has also the potential to adopt the conformation accommodated at both central positions of the betaIII/betaIII' turn or the (i + 1)th position of the betaI/beta'I turn.

Models MolecularAlkylationProtein ConformationStereochemistryMolecular ConformationAb initioCalorimetryN-acetyl-L-alanineGeneral Biochemistry Genetics and Molecular Biologyab initio/DFT calculationschemistry.chemical_compoundResidue (chemistry)AmideN-alkylpeptidesPeptide designAlanineHydrogen bondN′N′-dimethylamidesAmidesβ-turnsDipoleCrystallographyAlanine derivativechemistryThermodynamicsPeptidesActa Biochimica Polonica
researchProduct

Synthesis and Inhibitory Studies of Phosphonic Acid Analogues of Homophenylalanine and Phenylalanine towards Alanyl Aminopeptidases.

2020

A library of novel phosphonic acid analogues of homophenylalanine and phenylalanine, containing fluorine and bromine atoms in the phenyl ring, have been synthesized. Their inhibitory properties against two important alanine aminopeptidases, of human (hAPN, CD13) and porcine (pAPN) origin, were evaluated. Enzymatic studies and comparison with literature data indicated the higher inhibitory potential of the homophenylalanine over phenylalanine derivatives towards both enzymes. Their inhibition constants were in the submicromolar range for hAPN and the micromolar range for pAPN, with 1-amino-3-(3-fluorophenyl) propylphosphonic acid (compound 15c) being one of the best low-molecular inhibitors …

Models MolecularProtein Conformation alpha-HelicalMolecular modelStereochemistryPhosphorous AcidsSwinePhenylalaninelcsh:QR1-502PhenylalanineCD13 Antigenscomputer-aided simulationsInhibitory postsynaptic potential01 natural sciencesBiochemistrylcsh:MicrobiologyArticlePhenylalanine derivativesSubstrate SpecificitySmall Molecule Libraries03 medical and health sciencesStructure-Activity RelationshipAnimalsHumansProtein Interaction Domains and MotifsEnzyme Inhibitorsphosphonic acid inhibitorsMolecular Biology030304 developmental biologyAlaninechemistry.chemical_classification0303 health sciencesInhibitory potentialBinding Sites010405 organic chemistryChemistryAminobutyratesFluorineBromine0104 chemical sciencesIsoenzymesKineticsEnzymehuman and porcine alanine aminopeptidasefluorine and bromine substitutionThermodynamicsProtein Conformation beta-StrandProtein BindingBiomolecules
researchProduct

Conformational investigation of α,β-dehydropeptides. X. Molecular and crystal structure of Ac-ΔAla-NMe2 compared with those of Ac-L-Ala-NMe2, Ac-DL-A…

2002

A series of three homologous dimethyldiamides Ac-DeltaAla-NMe2, Ac-L-Ala-NMe2 and Ac-DL-Ala-NMe2 has been synthesized and the structures of these amides determined from single-crystal X-ray diffraction data. To learn more about the conformational preferences of compounds studied, the fully relaxed (phi-psi) conformational energy maps in vacuo (AM1) of Ac-DeltaAla-NMe2 and Ac-L-Ala-NMe2 were obtained, and the calculated minima reoptimized with the DFT/B3LYP/6-31G** method. The crystal-state results have been compared with the literature data. Ac-DeltaAla-NMe2 and other alpha,beta-dehydroamino acid dimethyldiamides, Ac-DeltaXaa-NMe2 adopt the conservative conformation of the torsion angles ph…

Models Moleculardehydroalanine derivativeProtein ConformationStereochemistryαPeptidedimethylamidesCrystal structureX‐ray crystallographyCrystallography X-RayBiochemistryEndocrinologyProtein structureMoleculeBeta (finance)crystal and molecular structuresalanine derivativesβ‐dehydroamino acidstheoretical calculationschemistry.chemical_classificationAlanineamino acid amidesAmino acidCrystallographydehydropeptideschemistryX-ray crystallographyPeptidesRamachandran plotJOURNAL OF PEPTIDE RESEARCH
researchProduct