A convenient incorporation of conformationally constrained 5,5-dimethylproline into the ribonuclease A 89-124 sequence by condensation of synthetic peptide fragments

Détails

ID Serval
serval:BIB_8138B0FCDF54
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A convenient incorporation of conformationally constrained 5,5-dimethylproline into the ribonuclease A 89-124 sequence by condensation of synthetic peptide fragments
Périodique
Journal of Peptide Research
Auteur(s)
Cerovsky  V., Welker  E., Scheraga  H. A.
ISSN
1397-002X (Print)
Statut éditorial
Publié
Date de publication
03/2003
Volume
61
Numéro
3
Pages
140-51
Notes
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S. --- Old month value: Mar
Résumé
The presence of l-5,5-dimethylproline (dmP) within an amino acid sequence results in the formation of an X-dmP peptide bond predominantly locked in a cis conformation. However, the common use of this unnatural amino acid has been hampered by the difficulty of the economical incorporation of the dmP residue into longer peptide segments due to the steric hindrance imposed by the dimethyl moieties. Here, we describe synthesis of the C-terminal 36-residue peptide, corresponding to the 89-124 sequence of bovine pancreatic ribonuclease A (RNase A), in which dmP is incorporated as a substitute for Pro93. The peptide was assembled by condensation of protected 5- and 31-residue peptide fragments, which were synthesized by solid-phase peptide methodology using fluorenylmethyloxycarbonyl chemistry. We focused on optimizing the synthesis of the Fmoc-Ser(tBu)-Ser(tBu)-Lys(Boc)-Tyr(tBu)-dmP-OH pentapeptide (residues 89-93) with efficient acylation of the sterically hindered dmP residue. In a comparative study, the reagent O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate was found to be superior to bromo-tris-pyrrolidino-phosphonium hexafluorophosphate and tetramethylfluoroformamidinium hexafluorophosphate for the synthesis of the -Tyr(tBu)-dmP- peptide bond in solution as well as on a resin.
Mots-clé
Amino Acids/chemistry Animals Cattle Chemistry Models, Chemical Peptide Biosynthesis Peptides/*chemistry Proline/*analogs & derivatives/*chemistry Protein Conformation Protein Structure, Tertiary Ribonuclease, Pancreatic/*chemistry Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization Time Factors
Pubmed
Web of science
Création de la notice
24/01/2008 15:40
Dernière modification de la notice
03/03/2018 18:47
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