Comparative evaluation of four trityl-type amidomethyl polystyrene resins in Fmoc solid phase peptide synthesis.
Four trityl-type (i.e. non-substituted trityl-, o-Cl-trityl-, o-F-trityl- and p-CN-trityl-) amidomethyl polystyrene resins were evaluated comparatively, in terms of the stability of the trityl-ester bond in slightly acidic dichloromethane solutions, and the p-CN-trityl-amidomethyl polystyrene resin was found to be the most stable of them. The above resins were applied, in parallel with Wang benzyl-type resin, well known for its stability in mild acidic conditions, to the Fmoc solid phase synthesis of the 43-amino acid residue long bioactive peptide thymosin beta-4. Independent of their differences in acid sensitivity, the resins seemed to function equally well under the conditions used, since pure thymosin beta-4 was obtained with a final yield of approximately 30% from each resin. The trityl-type amidomethyl polystyrene resins were also applied, in parallel with the Wang resin, to the Fmoc solid phase synthesis of a bioactive peptide containing proline at its C-terminus, i.e. the N-terminal tetrapeptide of thymosin beta-4, AcSDKP. In this case, the best yield (87%) was obtained with the o-Cl-trityl-amidomethyl polystyrene resin, which may be the resin of choice, of those studied, for the Fmoc solid phase peptide synthesis.
Zikos
Christos
C
Institute of Radioisotopes and Radiodiagnostic Products, National Center for Scientific Research Demokritos, Athens, Greece.
Livaniou
Evangelia
E
Leondiadis
Leondios
L
Ferderigos
Nikolas
N
Ithakissios
Dionyssis S
DS
Evangelatos
Gregory P
GP
D015394:Molecular Structure; D009842:Oligopeptides / Q000138:chemical synthesis*; D011137:Polystyrenes / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry*
D009842:Oligopeptides; D011137:Polystyrenes; D012117:Resins, Synthetic