Ligand ‐dependent intra‐ and inter‐domain motions in the PDZ12 tandem regulate binding interfaces in postsynaptic density protein‐95

AbstractThe postsynaptic density protein ‐95 (PSD‐95) regulates synaptic plasticity through interactions mediated by its peptide binding PDZ domains. The two N‐terminal PDZ domains of PSD‐95 form an autonomous structural unit, and their interdomain orientation and dynamics depend on ligand binding. To understand the mechanistic det ails of the effect of ligand binding, we generated conformational ensembles using available experimentally determined NOE interatomic distances and S2 order parameters. In our approach, the fast dynamics of the two domains is treated independently. We find that intradomain structural changes induced by ligand binding modulate the probability of the occurrence of specific domain ‐domain orientations. Our results suggest that the β2‐β3 loop in the PDZ domains is a key regulatory region, which influences both intradomain motions and supramodular rearrangement.

Source: FEBS Letters - September 27, 2019 Category: Biochemistry Authors: Bertalan Kov ács, Nóra Zajácz‐Epresi, Zoltán Gáspári Tags: Research Letter Source Type: research