title: The solid-phase synthesis of side-chain-phosphorylated peptide-4-nitroanilides.
abstract: Peptide-4-nitroanilides can be quickly synthesised using an Fmoc-based approach on 2-chlorotritylchloride resin. Preformed building blocks Fmoc-Xaa-NH-Np (Xaa = Cit, Cys, Gln, His, Lys, Orn, Ser, Thr, Tyr, Trp) can be attached via side chain to the 2-chlorotritylchloride linker of the resin. N-terminal elongation yields the respective peptide-4-nitroanilides after detachment from the solid support. We synthesised a set of tetrapeptide-4-nitroanilides with the general structure Suc-Ala-Phe-Pro-Xaa-NH-Np (Xaa = Asp, Cit, Cys, Glu, Gln, His, Lys, Orn, Ser, Thr, Tyr, Trp). Even peptidyl-arginine-4-nitroanilides are available by a slightly modified procedure. First, the appropriate ornithine-containing peptide was synthesised. After detachment of the peptide from the resin the side-chain primary amino group was transformed to the guanidino function of arginine using 1-guanyl-3,5-dimethylpyrazole. A further application of this method is the convenient synthesis of phosphorylated peptide-4-nitroanilides. Five phosphopeptides with the general structure Ac-Ala-Xaa(PO3H2)-Pro-Yaa-NH-Np (Xaa = Ser, Thr, Tyr; Yaa = Tyr, Lys) and their nonphosphorylated analogues were prepared. Global phosphorylation was carried out on the resin-bound peptides using dibenzyl-N, N-diisopropyl-phosphoramidite/tetrazole followed by oxidation with tert-butyl hydroperoxide.
authors.affiliation: Max-Planck-Gesellschaft zur Förderung der Wissenschaft e.V., Forschungsstelle Enzymologie der Proteinfaltung, Halle, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Bernhardt
authors.forename: M
authors.initials: M
authors.lastname: Drewello
authors.forename: M
authors.initials: M
authors.lastname: Schutkowski
mesh_terms: D000578:Amidines / Q000737:chemistry; D000596:Amino Acids / Q000737:chemistry; D000813:Anilides / Q000138:chemical synthesis*; D001120:Arginine / Q000031:analogs & derivatives; D005449:Fluorenes / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D010748:Phosphopeptides / Q000138:chemical synthesis*; D010766:Phosphorylation
chemical_list: D000578:Amidines; D000596:Amino Acids; D000813:Anilides; D005449:Fluorenes; C016456:N(alpha)-fluorenylmethyloxycarbonylamino acids; D010748:Phosphopeptides; C005993:3,5-dimethylpyrazole-1-carboxamidine; D001120:Arginine