Molecular mechanism of ATP binding and ion channel activation in P2X receptors

Motoyuki Hattori, Eric Gouaux

Research output: Contribution to journalArticle

280 Citations (Scopus)

Abstract

P2X receptors are trimeric ATP-activated ion channels permeable to Na +, K+ and Ca2+. The seven P2X receptor subtypes are implicated in physiological processes that include modulation of synaptic transmission, contraction of smooth muscle, secretion of chemical transmitters and regulation of immune responses. Despite the importance of P2X receptors in cellular physiology, the three-dimensional composition of the ATP-binding site, the structural mechanism of ATP-dependent ion channel gating and the architecture of the open ion channel pore are unknown. Here we report the crystal structure of the zebrafish P2X 4 receptor in complex with ATP and a new structure of the apo receptor. The agonist-bound structure reveals a previously unseen ATP-binding motif and an open ion channel pore. ATP binding induces cleft closure of the nucleotide-binding pocket, flexing of the lower body β-sheet and a radial expansion of the extracellular vestibule. The structural widening of the extracellular vestibule is directly coupled to the opening of the ion channel pore by way of an iris-like expansion of the transmembrane helices. The structural delineation of the ATP-binding site and the ion channel pore, together with the conformational changes associated with ion channel gating, will stimulate development of new pharmacological agents.

Original languageEnglish (US)
Pages (from-to)207-212
Number of pages6
JournalNature
Volume484
Issue number7397
DOIs
StatePublished - May 10 2012

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Ion Channels
Adenosine Triphosphate
Ion Channel Gating
Binding Sites
Physiological Phenomena
Purinergic P2 Receptors
Iris
Zebrafish
Synaptic Transmission
Smooth Muscle
Nucleotides
Pharmacology

ASJC Scopus subject areas

  • General

Cite this

Molecular mechanism of ATP binding and ion channel activation in P2X receptors. / Hattori, Motoyuki; Gouaux, Eric.

In: Nature, Vol. 484, No. 7397, 10.05.2012, p. 207-212.

Research output: Contribution to journalArticle

Hattori, Motoyuki ; Gouaux, Eric. / Molecular mechanism of ATP binding and ion channel activation in P2X receptors. In: Nature. 2012 ; Vol. 484, No. 7397. pp. 207-212.
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