title: Solid-phase synthesis of (tyrosyl-alanyl-glutamyl)n by segment condensation.
abstract: (Tyr-Ala-Glu)n, n = 1-9, were synthesized by segment condensation using the Fmoc/tert-butyl protection strategy and solid-phase techniques. The C-terminal residue was coupled to the resin and the peptides were built out by adding Fmoc-Glu(O-t-Bu)-Tyr(t-Bu)-Ala-OH units. When the desired lengths were reached the peptides were capped with Fmoc-Tyr(t-Bu)-Ala-OH units. Fmoc-Tyr(t-Bu)-Ala-OH and Fmoc-Glu(O-t-Bu)-Tyr(t-Bu)-Ala-OH were synthesized in aqueous solution by the successive addition of N-hydroxysuccinimide esters of Fmoc-Tyr(t-Bu) and Fmoc-Glu(O-t-Bu) to the growing chain. Neither sequential amino acid addition or segment condensation techniques were successful on polystyrene supports. However, the segment condensations were highly successful on kieselguhr-supported polydimethylacrylamide based resins. (Tyr-Ala-Glu)n, n = 1-9, were tested as inhibitors of the protein tyrosine kinase, pp60c-src. Inhibition, as measured by IC50 values, increased with increasing size of the peptide.
authors.affiliation: Department of Neuro-Oncology, University of Texas, M.D. Anderson Cancer Center, Houston.
authors.forename: N U
authors.initials: NU
authors.lastname: Obeyesekere
authors.forename: J N
authors.initials: JN
authors.lastname: La Croix
authors.forename: R J
authors.initials: RJ
authors.lastname: Budde
authors.forename: D F
authors.initials: DF
authors.lastname: Dyckes
authors.forename: J S
authors.initials: JS
authors.lastname: McMurray
mesh_terms: D000595:Amino Acid Sequence; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000494:pharmacology; D015688:Oncogene Protein pp60(v-src) / Q000037:antagonists & inhibitors / Q000378:metabolism; D010455:Peptides / Q000138:chemical synthesis / Q000494:pharmacology; D010766:Phosphorylation
chemical_list: D009842:Oligopeptides; D010455:Peptides; D015688:Oncogene Protein pp60(v-src)