期刊
SCIENCE SIGNALING
卷 7, 期 335, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/scisignal.2005431
关键词
-
资金
- Craig Nielsen Foundation
- NIH [GM065937, GM072881]
- National Center for Microscopy and Imaging Research [GM103412]
Pannexin1 (Panx1) participates in several signaling events that involve adenosine triphosphate (ATP) release, including the innate immune response, ciliary beat in airway epithelia, and oxygen supply in the vasculature. The view that Panx1 forms a large ATP release channel has been challenged by the association of a low-conductance, small anion-selective channel with the presence of Panx1. We showed that Panx1 membrane channels can function in two distinct modes with different conductances and permeabilities when heterologously expressed in Xenopus oocytes. When stimulated by potassium ions (K+), Panx1 formed a high-conductance channel of similar to 500 pS that was permeable to ATP. Various physiological stimuli can induce this ATP-permeable conformation of the channel in several cell types. In contrast, the channel had a low conductance (similar to 50 pS) with no detectable ATP permeability when activated by voltage in the absence of K+. The two channel states were associated with different reactivities of the terminal cysteine of Panx1 to thiol reagents, suggesting different conformations. Single-particle electron microscopic analysis revealed that K+ stimulated the formation of channels with a larger pore diameter than those formed in the absence of K+. These data suggest that different stimuli lead to distinct channel structures with distinct biophysical properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据