Journal
NATURE COMMUNICATIONS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms5189
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Funding
- National Excellent Young Scientist Foundation of China [31222018]
- National Program on Key Basic Research Project of China [2014CB910300, 2014CB910302, 2010CB529800]
- National Natural Science Foundation of China [31170787]
- Key National S&T Program 'Major New Drug Development' Grant [2012ZX09504001-003]
- Natural Science Foundation of Shanghai [12ZR1415600]
- Natural Science Foundation of Jiangsu Province [SBK201241903]
- 'Shanghai Jiao Tong University-SMC Mutual Funds' for Excellent Young Scholar
- 'Opening project' of Chinese Academy of Sciences, Shanghai Institute of Organic Chemistry
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Channel gating in response to extracellular ATP is a fundamental process for the physiological functions of P2X receptors. Here we identify coordinated allosteric changes in the left flipper (LF) and dorsal fin (DF) domains that couple ATP-binding to channel gating. Engineered disulphide crosslinking or zinc bridges between the LF and DF domains that constrain their relative motions significantly influence channel gating of P2X4 receptors, confirming the essential role of these allosteric changes. ATP-binding-induced alterations in interdomain hydrophobic interactions among I208, L217, V291 and the aliphatic chain of K193 correlate well with these coordinated relative movements. Mutations on those four residues lead to impaired or fully abolished channel activations of P2X4 receptors. Our data reveal that ATP-binding-induced altered interdomain hydrophobic interactions and the concomitant coordinated motions of LF and DF domains are allosteric events essential for the channel gating of P2X4 receptors.
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