title: Nanometer to millimeter scale peptide-porphyrin materials.
abstract: AQ-Pal14 is a 30-residue polypeptide that was designed to form an α-helical coiled coil that contains a metal-binding 4-pyridylalanine residue on its solvent-exposed surface. However, characterization of this peptide shows that it exists as a three-stranded coiled coil, not a two-stranded one as predicted from its design. Reaction with cobalt(III) protoporphyrin IX (Co-PPIX) produces a six-coordinate Co-PPIX(AQ-Pal14)(2) species that creates two coiled-coil oligomerization domains coordinated to opposite faces of the porphyrin ring. It is found that this species undergoes a buffer-dependent self-assembly process: nanometer-scale globular materials were formed when these components were reacted in unbuffered H(2)O, while millimeter-scale, rod-like materials were prepared when the reaction was performed in phosphate buffer (20 mM, pH 7). It is suggested that assembly of the globular material is dictated by the conformational properties of the coiled-coil forming AQ-Pal14 peptide, whereas that of the rod-like material involves interactions between Co-PPIX and phosphate ion.
authors.affiliation: Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, OH 43403, USA.
authors.forename: Daniil V
authors.initials: DV
authors.lastname: Zaytsev
authors.forename: Fei
authors.initials: F
authors.lastname: Xie
authors.forename: Madhumita
authors.initials: M
authors.lastname: Mukherjee
authors.forename: Alexey
authors.initials: A
authors.lastname: Bludin
authors.forename: Borries
authors.initials: B
authors.lastname: Demeler
authors.forename: Robert M
authors.initials: RM
authors.lastname: Breece
authors.forename: David L
authors.initials: DL
authors.lastname: Tierney
authors.forename: Michael Y
authors.initials: MY
authors.lastname: Ogawa
mesh_terms: D002021:Buffers; D002850:Chromatography, Gel; D002942:Circular Dichroism; D006863:Hydrogen-Ion Concentration; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D049329:Nanostructures / Q000737:chemistry*; D010455:Peptides / Q000138:chemical synthesis* / Q000737:chemistry*; D011487:Protein Conformation; D011524:Protoporphyrins / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D014461:Ultracentrifugation; D056928:X-Ray Absorption Spectroscopy
chemical_list: D002021:Buffers; D010455:Peptides; D011524:Protoporphyrins; C007095:cobaltiprotoporphyrin
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