title: Peptide nanofibers modified with a protein by using designed anchor molecules bearing hydrophobic and functional moieties.
abstract: Self-assembly of peptides and proteins is a key feature of biological functions. Short amphiphilic peptides designed with a beta-sheet structure can form sophisticated nanofiber structures, and the fibers are available as nanomaterials for arranging biomolecules. Peptide FI (H-PKFKIIEFEP-OH) self-assembles into nanofibers with a coiled fine structure, as reported in our previous work. We have constructed anchor molecules that have both a binding moiety for the fiber structure and a functional unit capable of capturing target molecules, with the purpose of arranging proteins on the designed peptide nanofibers. Designed anchors containing an alkyl chain as a binding unit and biotin as a functional moiety were found to bind to peptide fibers FI and F2i (H-ALEAKFAAFEAKLA-NH(2)). The surface-exposed biotin moiety on the fibers could capture an anti-biotin antibody. Moreover, hydrophobic dipeptide anchor units composed of iminodiacetate connected to Phe-Phe or Ile-Ile and a peptide composed of six histidine residues connected to biotin could also connect FI peptide fibers to the anti-biotin antibody through the chelation of Ni(2+) ions. This strategy of using designed anchors opens a novel approach to constructing nanoscale protein arrays on peptide nanomaterials.
authors.affiliation: Department of Bioengineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8501 (Japan), Fax: (+81) 45-924-5833.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Miyachi
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Takahashi
authors.forename: Sachiko
authors.initials: S
authors.lastname: Matsumura
authors.forename: Hisakazu
authors.initials: H
authors.lastname: Mihara
mesh_terms: D000595:Amino Acid Sequence; D001710:Biotin / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D057139:Nanofibers; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology; D009842:Oligopeptides / Q000138:chemical synthesis / Q000737:chemistry*; D010455:Peptides / Q000138:chemical synthesis / Q000737:chemistry*; D011485:Protein Binding; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry*
chemical_list: D009842:Oligopeptides; D010455:Peptides; D011506:Proteins; D001710:Biotin