title: A novel, multilayer structure of a helical peptide.
abstract: X-ray diffraction analysis at 1.5 A resolution has confirmed the helical conformation of a de novo designed 18-residue peptide. However, the crystal structure reveals the formation of continuous molecular layers of parallel-packed amphiphilic helices as a result of much more extensive helix-helix interactions than predicted. The crystal packing arrangement, by virtue of distinct antiparallel packing interactions, segregates the polar and apolar surfaces of the helices into discrete and well-defined interfacial regions. An extensive "ridges-into-grooves" interdigitation characterizes the hydrophobic interface, whereas an extensive network of salt bridges and hydrogen bonds dominates the corresponding hydrophilic interface.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Chicago, Illinois 60637, USA.
authors.forename: K S
authors.initials: KS
authors.lastname: Taylor
authors.forename: M Z
authors.initials: MZ
authors.lastname: Lou
authors.forename: T M
authors.initials: TM
authors.lastname: Chin
authors.forename: N C
authors.initials: NC
authors.lastname: Yang
authors.forename: R M
authors.initials: RM
authors.lastname: Garavito
mesh_terms: D000595:Amino Acid Sequence; D003196:Computer Graphics; D003460:Crystallization; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry*; D017433:Protein Structure, Secondary; D014867:Water / Q000737:chemistry
chemical_list: D010455:Peptides; D014867:Water