title: New design of helix bundle peptide-polymer conjugates.
abstract: We present a new design of peptide-polymer conjugates where a polymer chain is covalently linked to the side chain of a helix bundle-forming peptide. The effect of conjugated polymer chains on the peptide structure was examined using a de novo designed three-helix bundle and a photoactive four-helix bundle. Upon attachment of poly(ethylene glycol) to the exterior of the coiled-coil helix bundle, the peptide secondary structure was stabilized and the tertiary structure, that is, the coiled-coil helix bundle, was retained. When a heme-binding peptide as an example is used, the new peptide-polymer conjugate architecture also preserves the built-in functionalities within the interior of the helix bundle. It is expected that the conjugated polymer chains act to mediate the interactions between the helix bundle and its external environment. Thus, this new peptide-polymer conjugate design strategy may open new avenues to macroscopically assemble the helix bundles and may enable them to function in nonbiological environments.
authors.affiliation: Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.
authors.forename: Jessica Y
authors.initials: JY
authors.lastname: Shu
authors.forename: Cen
authors.initials: C
authors.lastname: Tan
authors.forename: William F
authors.initials: WF
authors.lastname: DeGrado
authors.forename: Ting
authors.initials: T
authors.lastname: Xu
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D006863:Hydrogen-Ion Concentration; D008968:Molecular Conformation; D010455:Peptides / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D017510:Protein Folding; D017433:Protein Structure, Secondary; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014461:Ultracentrifugation
chemical_list: D001672:Biocompatible Materials; D010455:Peptides; D011108:Polymers; D011092:Polyethylene Glycols