title: Two pentadehydropeptides with different configurations of the DeltaPhe residues.
abstract: Comparison of the crystal structures of two pentadehydropeptides containing DeltaPhe residues, namely (Z,Z)-N-(tert-butoxycarbonyl)glycyl-alpha,beta-phenylalanylglycyl-alpha,beta-phenylalanylglycine (or Boc(0)-Gly(1)-Delta(Z)Phe(2)-Gly(3)-Delta(Z)Phe(4)-Gly(5)-OH) methanol solvate, C(29)H(33)N(5)O(8) x CH(4)O, (I), and (E,E)-N-(tert-butoxycarbonyl)glycyl-alpha,beta-phenylalanylglycyl-alpha,beta-phenylalanylglycine (or Boc(0)-Gly(1)-Delta(E)Phe(2)-Gly(3)-Delta(E)Phe(4)-Gly(5)-OH), C(29)H(33)N(5)O(8), (II), indicates that the Delta(Z)Phe residue is a more effective inducer of folded structures than the Delta(E)Phe residue. The values of the torsion angles phi and psi show the presence of two type-III' beta-turns at the Delta(Z)Phe residues and one type-II beta-turn at the Delta(E)Phe residue. All amino acids are linked trans to each other in both peptides. Beta-turns present in the peptides are stabilized by intramolecular 4-->1 hydrogen bonds. Molecules in both structures form two-dimensional hydrogen-bond networks parallel to the (100) plane.
authors.affiliation: Institute of Chemistry, University of Opole, 48 Oleska Street, 45-052 Opole, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Makowski
authors.forename: Marek
authors.initials: M
authors.lastname: Lisowski
authors.forename: Anna
authors.initials: A
authors.lastname: Maciag
authors.forename: Maciej
authors.initials: M
authors.lastname: Wiktor
authors.forename: Anna
authors.initials: A
authors.lastname: Szlachcic
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Lis
mesh_terms: D000595:Amino Acid Sequence; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009842:Oligopeptides / Q000737:chemistry*; D010649:Phenylalanine / Q000737:chemistry*; D011485:Protein Binding; D011487:Protein Conformation
chemical_list: D009842:Oligopeptides; D010649:Phenylalanine