title: Peptide-lanthanide interactions. Crystal structure of a europium(III)-triglycine complex.
abstract: Crystals of Eu-(Gly-Gly-Gly).(H2O)5.(ClO4)3 are triclinic, spacegroup P1 with a = 9.123 (2), b = 11.185 (5), c = 11.426 (2) A; alpha = 90.79 (2), beta = 98.08 (1), gamma = 98.57 (2) degrees; Z = 2. The europium cation is surrounded by four oxygens from three different peptide units and four oxygens from water molecules. The geometry around the metal is a distorted bi-capped trigonal prism. The peptide backbone conformation in this complex is compared with those in the free peptide and in various metal complexes. Considerable differences are observed between Eu(III) and Ca(II) complexes of triglycine.
authors.affiliation: Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore.
authors.forename: K
authors.initials: K
authors.lastname: Aparna
authors.forename: P
authors.initials: P
authors.lastname: Balaram
authors.forename: S S
authors.initials: SS
authors.lastname: Krishnamurthy
authors.forename: M
authors.initials: M
authors.lastname: Nethaji
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D002118:Calcium / Q000378:metabolism; D002412:Cations; D003460:Crystallization; D018360:Crystallography, X-Ray; D005063:Europium / Q000737:chemistry* / Q000378:metabolism; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009842:Oligopeptides / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation
chemical_list: D002412:Cations; D009842:Oligopeptides; D005063:Europium; C035647:glycyl-glycyl-glycine; D002118:Calcium