Brain Res Mol Brain Res 1997 Dec 01;521:157-61. doi: 10.1016/s0169-328x(97)00275-1.

An active-site histidine of NR1/2C mediates voltage-independent inhibition by zinc.

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Endogenous zinc is an important modulator of ion channels of the central nervous system. To understand mechanisms of zinc inhibition, cloned heteromeric N-methyl-D-aspartate receptors (primary subunit NR1 with secondary subunits NR2A, NR2C or NR2D) were expressed in Xenopus oocytes and studied under two-electrode voltage-clamp. Voltage-independent inhibition of NR1/2A heteromers by nanomolar concentrations of extracellular zinc was observed in barium-containing perfusion solutions. In contrast, voltage-independent zinc inhibition of NR1/2C heteromers occurred with lower affinity. Zinc inhibition data from NR1/2D heteromers was fit well with a voltage-independent one-site model and resembled that previously reported for NR1/2B. Reduction of zinc inhibition of NR1/2C heteromers was seen after labeling with the histidine-modifying reagent diethylpyrocarbonate. This finding suggests that the NR1/2C heteromeric ion channel contains an active-site histidine responsible for zinc inhibition.

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Species referenced: Xenopus laevis
Genes referenced: grin1 grin2a grin2c nodal1