title: Design, synthesis, and characterization of new cyclic d,l-α-alternate amino acid peptides by capillary electrophoresis coupled to electrospray ionization mass spectrometry.
abstract: The self-assembly of peptide nanotubes (PNTs) depends on the structure and chemistry of cyclic peptide (CP) monomers, having an impact on their properties, making the choice of their monomers and their characterization a great challenge. We synthesized for the first time a new set of eight original CP sequences of 8, 10, and 12 d,l-α-alternate amino acids with a controlled internal diameter from 7 to 13 Å. They present various properties (e.g., diameter, global surface charge, hydrophobicity) that can open the way to new applications. Their structure and purity were determined thanks to a capillary electrophoresis coupled to electrospray ionization mass spectrometry (CE-ESI-MS) methodology developed for the first time for this purpose. The CPs were successfully separated in a basic hydro-organic background electrolyte (BGE, pH 8.0, H2O/EtOH 50:50, v/v) and analyzed in MS positive mode. The effect of CP structure on electrophoretic mobility was studied, and the mass spectra were deeply analyzed. This methodology allowed verifying their purity and the absence of linear peptide precursors as well as their stability when stored over several months. Therefore, we have developed a new CE-ESI-MS methodology for the structure and purity control of interesting potential precursors for PNTs that could be employed as nanoplatforms in diagnostics or as pseudo sieving tools for separative purposes.
authors.affiliation: PSL Research University, Chimie ParisTech, Unité de Technologies Chimiques et Biologiques pour la Santé, 75005, Paris, France; INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé (U 1022), 75006, Paris, France; CNRS, Unité de Technologies Chimiques et Biologiques pour la Santé UMR 8258, 75006, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Unité de Technologies Chimiques et Biologiques pour la Santé, 75006, Paris, France; Departamento de Química, Universidad de Guanajuato, 36050, Guanajuato, México.
authors.forename: María Dámaris
authors.initials: MD
authors.lastname: Cortez-Díaz
authors.affiliation: PSL Research University, Chimie ParisTech, Unité de Technologies Chimiques et Biologiques pour la Santé, 75005, Paris, France; INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé (U 1022), 75006, Paris, France; CNRS, Unité de Technologies Chimiques et Biologiques pour la Santé UMR 8258, 75006, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Unité de Technologies Chimiques et Biologiques pour la Santé, 75006, Paris, France.
authors.forename: Fanny
authors.initials: F
authors.lastname: d'Orlyé
authors.affiliation: Departamento de Química, Universidad de Guanajuato, 36050, Guanajuato, México.
authors.forename: Silvia
authors.initials: S
authors.lastname: Gutierrez-Granados
authors.affiliation: Departamento de Química, Universidad de Guanajuato, 36050, Guanajuato, México.
authors.forename: Luis Manuel
authors.initials: LM
authors.lastname: de Leon-Rodriguez
authors.affiliation: PSL Research University, Chimie ParisTech, Unité de Technologies Chimiques et Biologiques pour la Santé, 75005, Paris, France; INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé (U 1022), 75006, Paris, France; CNRS, Unité de Technologies Chimiques et Biologiques pour la Santé UMR 8258, 75006, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Unité de Technologies Chimiques et Biologiques pour la Santé, 75006, Paris, France. Electronic address: anne.varenne@chimie-paristech.fr.
authors.forename: Anne
authors.initials: A
authors.lastname: Varenne
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D015195:Drug Design; D019075:Electrophoresis, Capillary; D008968:Molecular Conformation; D010456:Peptides, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D000596:Amino Acids; D010456:Peptides, Cyclic
keywords: Capillary electrophoresis; Cyclic peptides; Electrospray ionization; Mass spectrometry; Peptide nanotubes; Purity