Arylation of Phe and Tyr Side Chains of Unprotected Peptides by a Suzuki−Miyaura Reaction in Water
摘要:
An efficient arylation in water of tyrosine and phenylalanine side chains from unprotected iodopeptides is accomplished by using Suzuki-Miyaura cross-coupling processes. The method is compatible with the hydrophilic and thermolabile nature of biologically active peptides. Also of interest, the arylated tyrosine peptides can be accessed in one-pot mode starting from native peptides.
Modulation of the Interaction between a Peptide Ligand and a G Protein-Coupled Receptor by Halogen Atoms
摘要:
Systematic halogenation of two native opioid peptides has shown that halogen atoms can modulate peptide receptor interactions in different manners. First, halogens may produce a steric hindrance that reduces the binding of the peptide to the receptor. Second, chlorine, bromine, or iodine may improve peptide binding if their positive sigma-hole forms a halogen bond interaction with negatively charged atoms of the protein. Lastly, the negative electrostatic potential of fluorine can interact with positively charged atoms of the protein to improve peptide binding.