title: A general method for preparation of peptides biotinylated at the carboxy terminus.
abstract: A method for the preparation of a biotinylated resin that can be elongated by standard methods of solid-phase peptide synthesis to give peptides biotinylated at the carboxy terminus is described. This methodology is particularly important for the preparation of biotinylated peptides in which a free amino terminus is required. Coupling of N epsilon-9-fluorenylmethoxycarbonyl-(Fmoc)-N alpha-tert-butyloxycarbonyl(Boc)-L- lysine to p-methylbenzhydrylamine resin, followed by removal of the Fmoc protecting group and reaction with (+)-biotin-4-nitrophenyl ester yielded N alpha-Boc-biocytin-p-methyl-benzhydrylamine resin. The utility of this resin was tested by the synthesis of a biotinylated peptide, Gly-Asn-Ala-Ala-Ala-Ala-Arg-Arg-biocytin-NH2, for use as an in vitro substrate for myristoyl-CoA:protein N-myristoyltransferase (NMT), the enzyme that catalyzes protein N-myristoylation. Analysis of the peptide derivative by HPLC and mass spectrometry revealed a single major product of the expected mass, indicating that the biotin group survived cleavage and deprotection with HF. The biotinylated peptide served as a substrate for NMT, and the resulting myristoylated peptide could be quantitatively recovered by adsorption to immobilized avidin.
authors.affiliation: Department of Medicinal Chemistry and Pharmacognosy, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, Indiana 47907.
authors.forename: R L
authors.initials: RL
authors.lastname: Geahlen
authors.forename: G M
authors.initials: GM
authors.lastname: Loudon
authors.forename: L A
authors.initials: LA
authors.lastname: Paige
authors.forename: D
authors.initials: D
authors.lastname: Lloyd
mesh_terms: D000595:Amino Acid Sequence; D001360:Avidin / Q000737:chemistry; D001710:Biotin / Q000737:chemistry*; D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D008239:Lysine / Q000031:analogs & derivatives / Q000737:chemistry; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000737:chemistry* / Q000378:metabolism; D012685:Sepharose
chemical_list: D009842:Oligopeptides; D001360:Avidin; D001710:Biotin; D012685:Sepharose; C013411:biocytin; D008239:Lysine