title: Parallel-oriented fibrogenesis of a beta-sheet forming peptide on supported lipid bilayers.
abstract: Peptide self-assembly on substrates is currently an intensively studied topic that provides a promising strategy for fabrication of soft materials and is also important for revealing the surface chemistry of amyloidogenic proteins that aggregate on cell membranes. We investigated the fibrogenesis of a beta-sheet forming peptide Abeta(26-35) on supported lipid bilayers (SLBs) by in situ atomic force microscopy (AFM), circular dichroism (CD), and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The results show that the Abeta(26-35) nanofilaments' growth is oriented to a specific direction and formed a highly ordered, large-scale, parallel-oriented surface pattern on membranes. The parallel-oriented fibrogenesis of Abeta(26-35) was able to occur on different lipid membranes rather than on solid substrates. It implies that the parallel-oriented fibrogenesis was associated with the distinct properties of lipid membranes, such as the fluid nature of lipid molecules on membranes. The membrane fluidity may allow the peptide assemblies to float at the water-membrane interface and easily orient to an energetically favorable state. These results provide an insight into the surface chemistry of peptide self-assembly on lipid membranes and highlight a possible way to fabricate supramolecular architectures on the surface of soft materials.
authors.affiliation: Single-Molecule and Nanobiology Laboratory, Department of Biophysics, School of Basic Medical Sciences, Biomed-X Center, and Center for Protein Science, Peking University, Beijing 100083, China.
authors.forename: Lan
authors.initials: L
authors.lastname: Zhang
authors.forename: Jian
authors.initials: J
authors.lastname: Zhong
authors.forename: Lixin
authors.initials: L
authors.lastname: Huang
authors.forename: Lijun
authors.initials: L
authors.lastname: Wang
authors.forename: Yuankai
authors.initials: Y
authors.lastname: Hong
authors.forename: Yinlin
authors.initials: Y
authors.lastname: Sha
mesh_terms: D016229:Amyloid beta-Peptides / Q000737:chemistry* / Q000378:metabolism*; D002942:Circular Dichroism; D008051:Lipid Bilayers / Q000378:metabolism*; D018625:Microscopy, Atomic Force; D010713:Phosphatidylcholines / Q000378:metabolism; D017433:Protein Structure, Secondary; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D016229:Amyloid beta-Peptides; D008051:Lipid Bilayers; D010713:Phosphatidylcholines; C028694:1-palmitoyl-2-oleoylphosphatidylcholine