Identification and mechanism of action of two histidine residues underlying high-affinity Zn2+ inhibition of the NMDA receptor

Zinc (Zn2+) inhibition of N-methyl-D-aspartate receptor (NMDAR) activity in volves both voltage-independent and voltage-dependent components. Recombina nt NR1/NR2A and NR1/NR2B receptors exhibit similar voltage-dependent block, but voltage-independent Zn2+ inhibition occurs with much higher affinity f or NR1/NR2A than NR1/NR2B receptors (nanomolar versus micromolar IC50, resp ectively). Here, we show that two neighboring histidine residues on NR2A re present the critical determinant (termed the "short spacer") for high-affin ity, voltage-independent Zn2+ inhibition using the Xenopus oocyte expressio n system and site-directed mutagenesis. Mutation of either one of these two histidine residues (H42 and H44) in the extracellular N-terminal domain of NR2A shifted the IC50 for high-affinity Zn2+ inhibition similar to 200-fol d without affecting the EC50 of the coagonists NMDA and glycine. We suggest that the mechanism of high-affinity Zn2+ inhibition on the NMDAR involves enhancement of proton inhibition.