Structural studies of ion permeation and Ca2+ blockage of a bacterial channel mimicking the cyclic nucleotide-gated channel pore
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چکیده
منابع مشابه
A Point Mutation in the Pore Region Alters Gating, Ca2+Blockage, and Permeation of Olfactory Cyclic Nucleotide–Gated Channels
Upon stimulation by odorants, Ca(2+) and Na(+) enter the cilia of olfactory sensory neurons through channels directly gated by cAMP. Cyclic nucleotide-gated channels have been found in a variety of cells and extensively investigated in the past few years. Glutamate residues at position 363 of the alpha subunit of the bovine retinal rod channel have previously been shown to constitute a cation-b...
متن کاملCa2+ permeation in cyclic nucleotide-gated channels.
Cyclic nucleotide-gated (CNG) channels conduct Na+, K+ and Ca2+ currents under the control of cGMP and cAMP. Activation of CNG channels leads to depolarization of the membrane voltage and to a concomitant increase of the cytosolic Ca2+ concentration. Several polypeptides were identified that constitute principal and modulatory subunits of CNG channels in both neurons and non-excitable cells, co...
متن کاملCryoEM structure of a prokaryotic cyclic nucleotide-gated ion channel.
Cyclic nucleotide-gated (CNG) and hyperpolarization-activated cyclic nucleotide-regulated (HCN) ion channels play crucial physiological roles in phototransduction, olfaction, and cardiac pace making. These channels are characterized by the presence of a carboxyl-terminal cyclic nucleotide-binding domain (CNBD) that connects to the channel pore via a C-linker domain. Although cyclic nucleotide b...
متن کاملβ Subunits of the Olfactory Cyclic Nucleotide-Gated Channel Form a Nitric Oxide Activated Ca2+ Channel
Cyclic nucleotide-gated channels are important in visual and olfactory transduction, and possibly in other neuronal functions. These channels have a complex permeability to Ca2+ ions that may be important in their cellular functions. They are composed of two different subunits, alpha and beta, that have been cloned and expressed, but the beta subunit alone cannot be activated by cyclic nucleoti...
متن کاملAn inward current induced by a putative cyclic nucleotide-gated channel in rat cerebellar Purkinje neurons
The roles of cyclic nucleotide-gated (CNG) channels in sensory transduction have long been recognized. More recent studies found that CNG channels are distributed in multiple brain regions involved in memory and learning, including the cortex, hippocampus and cerebellum. These findings suggest that their functions are not limited to sensory perception, but also to neuronal plasticity phenomena,...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2010
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.1013643108