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1.
Amino Acids ; 56(1): 18, 2024 Mar 01.
Article in English | MEDLINE | ID: mdl-38427104

ABSTRACT

A series of 10 cyclic, biaryl analogs of enkephalin, with Tyr or Phe residues at positions 1 and 4, were synthesized according to the Miyaura borylation and Suzuki coupling methodology. Biaryl bridges formed by side chains of the two aromatic amino acid residues are of the meta-meta, meta-para, para-meta, and para-para configuration. Conformational properties of the peptides were studied by CD and NMR. CD studies allowed only to compare conformations of individual peptides while NMR investigations followed by XPLOR calculations provided detailed information on their conformation. Reliability of the XPLOR calculations was confirmed by quantum chemical ones performed for one of the analogs. No intramolecular hydrogen bonds were found in all the peptides. They are folded and adopt the type IV ß-turn conformation. Due to a large steric strain, the aromatic carbon atoms forming the biaryl bond are distinctly pyramidalized. Seven of the peptides were tested in vitro for their affinity for the µ-opioid receptor.


Subject(s)
Enkephalins , Peptides, Cyclic , Cyclization , Reproducibility of Results , Enkephalins/chemistry , Protein Conformation , Peptides, Cyclic/chemistry
2.
PLoS One ; 15(6): e0234901, 2020.
Article in English | MEDLINE | ID: mdl-32579565

ABSTRACT

Lasso peptides are unique in that the tail of the lasso peptide threads through its macrolactam ring. The unusual structure and biological activity of lasso peptides have generated increased interest from the scientific community in recent years. Because of this, many new types of lasso peptides have been discovered. These peptides can be synthesized by microorganisms efficiently, and yet, their chemical assembly is challenging. Herein, we investigated the possibility of high pressure inducing the cyclization of linear precursors of lasso peptides. Unlike other molecules like rotaxanes which mechanically interlock at high pressure, the threaded lasso peptides did not form, even at pressures the high pressure up to 14 000 kbar.


Subject(s)
Peptides/chemistry , Peptides/chemical synthesis , Amino Acid Sequence , Cyclization , Disulfides/chemistry , Oxidation-Reduction , Pressure , Protein Conformation , Solutions
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