Journal article

Insights into the structural basis for zinc inhibition of the glycine receptor

ST Nevin, BA Cromer, JL Haddrill, CJ Morton, MW Parker, JW Lynch

Journal of Biological Chemistry | AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC | Published : 2003

Abstract

Histidines 107 and 109 in the glycine receptor (GlyR) alpha1 subunit have previously been identified as determinants of the inhibitory zinc-binding site. Based on modeling of the GlyR alpha1 subunit extracellular domain by homology to the acetylcholine-binding protein crystal structure, we hypothesized that inhibitory zinc is bound within the vestibule lumen at subunit interfaces, where it is ligated by His107 from one subunit and His109 from an adjacent subunit. This was tested by co-expressing alpha1 subunits containing the H107A mutation with alpha1 subunits containing the H109A mutation. Although sensitivity to zinc inhibition is markedly reduced when either mutation is individually inco..

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