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Chemical shift assignments of calmodulin bound to the β-subunit of a retinal cyclic nucleotide-gated channel (CNGB1)

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https://doi.org/10.1007/s12104-022-10072-9
Abstract

Rod cyclic nucleotide-gated (CNG) channels are formed by two protein subunits (CNGA1 and CNGB1). Calmodulin (CaM) binds to the cytosolic regulatory domain of CNGB1 and decreases the open probability of CNGA1/CNGB1 channels. The CaM binding site within bovine CNGB1 (residues 679-702) binds tightly to Ca2+-bound CaM, which promotes Ca2+-induced inactivation of CNGA1/CNGB1 channels in retinal rods. We report complete NMR chemical shift assignments of Ca2+-saturated CaM bound to the CaM-binding domain of CNGB1 (BMRB no. 51222).

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