title: Microwave-assisted solid-phase peptide synthesis of the 60-110 domain of human pleiotrophin on 2-chlorotrityl resin.
abstract: A fast and efficient microwave-assisted solid phase peptide synthesis (MW-SPPS) of a 51mer peptide, the main heparin-binding site (60-110) of human pleiotrophin (hPTN), using 2-chlorotrityl chloride resin (CLTR-Cl) following the 9-fluorenylmethyloxycarbonyl/tert-butyl (Fmoc/tBu) methodology and with the standard N,N'-diisopropylcarbodiimide/1-hydroxybenzotriazole (DIC/HOBt) coupling reagents, is described. An MW-SPPS protocol was for the first time successfully applied to the acid labile CLTR-Cl for the faster synthesis of long peptides (51mer peptide) and with an enhanced purity in comparison to conventional SPPS protocols. The synthesis of such long peptides is not trivial and it is generally achieved by recombinant techniques. The desired linear peptide was obtained in only 30 h of total processing time and in 51% crude yield, in which 60% was the purified product obtained with 99.4% purity. The synthesized peptide was purified by reversed phase high performance liquid chromatography (RP-HPLC) and identified by electrospray ionization mass spectrometry (ESI-MS). Then, the regioselective formation of the two disulfide bridges of hPTN 60-110 was successfully achieved by a two-step procedure, involving an oxidative folding step in dimethylsulfoxide (DMSO) to form the Cys(77)-Cys(109) bond, followed by iodine oxidation to form the Cys(67)-Cys(99) bond.
authors.affiliation: Department of Chemistry, University of Patras, 265 04, Patras, Greece.
authors.forename: Irene
authors.initials: I
authors.lastname: Friligou
authors.forename: Evangelia
authors.initials: E
authors.lastname: Papadimitriou
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Gatos
authors.forename: John
authors.initials: J
authors.lastname: Matsoukas
authors.forename: Theodore
authors.initials: T
authors.lastname: Tselios
mesh_terms: D002352:Carrier Proteins / Q000737:chemistry*; D016207:Cytokines / Q000737:chemistry*; D006801:Humans; D008872:Microwaves; D015394:Molecular Structure; D010455:Peptides / Q000138:chemical synthesis* / Q000737:chemistry / Q000302:isolation & purification; D012117:Resins, Synthetic / Q000737:chemistry* / Q000302:isolation & purification; D014320:Triphenylmethyl Compounds / Q000737:chemistry*
chemical_list: D002352:Carrier Proteins; D016207:Cytokines; D010455:Peptides; D012117:Resins, Synthetic; D014320:Triphenylmethyl Compounds; C066845:pleiotrophin; C071065:2-chlorotrityl chloride