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Updated: Jan 14, 2026

Measuring Nucleotide Binding to Intact, Functional Membrane Proteins in Real Time
Published on: March 11, 2021
Structural mechanisms of assembly, gating, and calmodulin modulation of human olfactory CNG channel
Jing Xue1,2, Ninghai Gan3,4, Weizhong Zeng3,4
1Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA. jxue@shsmu.edu.cn.
Abstract:
Mammalian cyclic nucleotide-gated (CNG) channels play crucial roles in visual and olfactory signal transduction. In olfactory sensory neurons, the native CNG channel functions as a heterotetramer consisting of CNGA2, CNGA4, and CNGB1b subunits and is activated by cAMP. Calmodulin (CaM) modulates the activity of the olfactory CNG channel, enabling rapid adaptation to odorants. Here we present cryo-EM structures of the native human olfactory CNGA2/A4/B1b channel in both CaM-bound closed and cAMP-bound open states, elucidating the molecular basis of the 2:1:1 subunit stoichiometry in channel assembly and the asymmetrical channel gating upon cAMP activation. Combining structural and functional analyses with AlphaFold prediction, we define two distinct CaM binding sites (CaM1 and CaM2) on the N- and C-terminal regions of CNGB1b, respectively, shedding light on the molecular mechanism of Ca2+/CaM-mediated rapid inhibition of the native olfactory CNG channel.
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