Unique residues in the ATP gated human P2X7 receptor define a novel allosteric binding pocket for the selective antagonist AZ10606120.

ABSTRACT: The P2X7 receptor (P2X7R) for ATP is a therapeutic target for pathophysiological states including inflammation, pain management and epilepsy. This is facilitated by the predicted low side effect profile as the high concentrations of ATP required to activate the receptor are usually only found following cell damage/disease and so P2X7Rs respond to a "danger" signal and are not normally active. AZ10606120 is a selective antagonist for P2X7Rs (IC₅₀ of ~10 nM) and ineffective at the P2X1R (at 10 μM). To determine the molecular basis of selectivity we generated a series of P2X7/1R chimeras and mutants. Two regions that are unique to the P2X7R, a loop insertion (residues 73-79) and threonine residues T90 and T94, are required for high affinity antagonist action. Point mutations ruled

SUBMITTER: Allsopp RC 

PROVIDER: S-EPMC5429621 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature