{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T11:42:21Z","timestamp":1791286941943,"version":"4.1.0"},"reference-count":43,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,8,17]],"date-time":"2005-08-17T00:00:00Z","timestamp":1124236800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Neurochemistry"],"published-print":{"date-parts":[[2005,10]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>To assess the mechanism of P2X<jats:sub>2<\/jats:sub> receptor modulation by transition metals, the cDNA for the wild\u2010type receptor was injected to <jats:italic>Xenopus laevis<\/jats:italic> oocytes and examined 48\u201372\u2003h later by the two\u2010electrode voltage\u2010clamp technique. Copper was the most potent of the trace metals examined; at 10\u2003\u03bc<jats:sc>m<\/jats:sc> it evoked a 25\u2010fold potentiation of the 10\u2003\u03bc<jats:sc>m<\/jats:sc> ATP\u2010gated currents. Zinc, nickel or mercury required 10\u2010fold larger concentrations to cause comparable potentiations, while palladium, cobalt or cadmium averaged only 12\u2010 and 3\u2010fold potentiations, respectively. Platinum was inactive. The non\u2010additive effect of copper and zinc at 10\u2013100\u2003\u03bc<jats:sc>m<\/jats:sc> suggests a common site of action; these metals also shifted to the left the ATP concentration\u2013response curves. To define residues necessary for trace metal modulation, alanines were singly substituted for each of the nine histidines in the extracellular domain of the rat P2X<jats:sub>2<\/jats:sub> receptor. The H120A and H213A mutants were resistant to the modulator action of copper, zinc and other metals with the exception of mercury. Mutant H192A showed a reduction but not an abrogation of the copper or zinc potentiation. H245A showed less affinity for copper while this mutant flattened the zinc\u2010induced potentiation. Mutant H319A reduced the copper but not the zinc\u2010induced potentiation. In contrast, mutants H125A, H146A, H152A and H174A conserved the wild\u2010type receptor sensitivity to trace metal modulation. We propose that His120, His192, His213 and His245 form part of a common allosteric metal\u2010binding site of the P2X<jats:sub>2<\/jats:sub> receptor, which for the specific coordination of copper, but not zinc, additionally involves His319.<\/jats:p>","DOI":"10.1111\/j.1471-4159.2005.03387.x","type":"journal-article","created":{"date-parts":[[2005,9,27]],"date-time":"2005-09-27T16:11:29Z","timestamp":1127837489000},"page":"499-512","source":"Crossref","is-referenced-by-count":39,"title":["Extracellular histidine residues identify common structural determinants in the copper\/zinc P2X<sub>2<\/sub> receptor modulation"],"prefix":"10.1111","volume":"95","author":[{"given":"Ram\u00f3n A.","family":"Lorca","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudio","family":"Coddou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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