Design, Synthesis, Evaluation, and Structural Studies of C2-Symmetric Small Molecule Inhibitors of Programmed Cell Death-1/Programmed Death-Ligand 1 Protein–Protein Interaction
摘要:
A series of C-2-symmetric inhibitors was designed and evaluated for inhibitory activity against the programmed cell death-1/programmed death-ligand 1(PD-1/PD-L1) protein protein interaction (PPI) in a homogenous time-resolved fluorescence (HTRF) assay and PD-1 signaling in cell-based coculture assays. CZ symmetric inhibitors 2a (LH1306) and 2b (LH1307) exhibited ICso values of 25 and 3.0 nM, respectively, in the HTRF assay. While 2a was similar to 3.8-fold more potent than previously reported inhibitor la, 2b could not be differentiated from lb due to their high potency and the limit of our HTRF assay conditions. In one cell-based coculture PD-1 signaling assay, 2a and 2b were 8.2- and 2.8-fold more potent in inhibiting PD-1 signaling than la and lb, respectively. NMR and X-ray cocrystal structural studies provided more structural insights into the interaction between 2b and PD-L1; 2b binds to PD-L1 at the PD-1 binding site and induces the formation of a more symmetrically arranged PD-L1 homodimer than that previously reported for other inhibitors.
Calixarene and hemicarcerand-like compounds obtained by self-assembly of 3-aminophenylboronic acid and salicylaldehyde derivatives
摘要:
One-pot synthesis of calixarene and hemicarcerand like compounds can be modulated by use of mono- or bis-salicylaldehyde derivatives respectively, reacting with 3-aminophenylboronic acid. Thus, the first part of this work is focused on the synthesis of calix-like compounds derived from salicylaldehyde units including different substituents on the aromatic moiety. Seven different calix structures are described and their structural analysis has been carried out by spectroscopic techniques. The second part corresponds to the description of bis-salicylaldehyde derivatives, synthesis and reactivity towards the 3-aminophenylboronic acid leading to the formation of hemicarcerand-like compounds. Aliphatic and aromatic chains were inserted as linkers between the two salicylaldehyde units in order to evaluate the influence on the formation of the hemicarcerands compounds. Both, calixarene and hemicarcerand compounds resulted from condensation reactions, wherein the formation of N-B coordination bonds plays a significant role on the macrocyclization process. (C) 2013 Elsevier B.V. All rights reserved.