RGD Reference Report - A histidine scan to probe the flexibility of the rat P2X2 receptor zinc-binding site. - Rat Genome Database

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A histidine scan to probe the flexibility of the rat P2X2 receptor zinc-binding site.

Authors: Tittle, RK  Power, JM  Hume, RI 
Citation: Tittle RK, etal., J Biol Chem. 2007 Jul 6;282(27):19526-33. Epub 2007 May 21.
RGD ID: 1642653
Pubmed: PMID:17517890   (View Abstract at PubMed)
DOI: DOI:10.1074/jbc.M701604200   (Journal Full-text)

The response of P2X(2) receptors to submaximal concentrations of ATP is potentiated by low levels of extracellular zinc. Histidines 120 and 213 have previously been shown to be essential in binding zinc across an intersubunit binding site. We tested the flexibility of the zinc-binding site by making mutations that had the effect of shifting the two essential histidines up to 13 residues upstream or downstream from their original positions and then testing the ability of the mutated receptors to respond to zinc. Using this method, we were able to explore potential orientations of the two regions relative to one another. Our data are consistent with a moderately flexible zinc-binding site and inconsistent with parallel and anti-parallel orientations of the regions surrounding histidines 120 and 213.

Gene Ontology Annotations    Click to see Annotation Detail View

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
ATP binding  IDA 1642653 RGD 
extracellularly ATP-gated monoatomic cation channel activity  IDA 1642653 RGD 
zinc ion binding  IDA 1642653 RGD 

Objects Annotated

Genes (Rattus norvegicus)
P2rx2  (purinergic receptor P2X 2)


Additional Information