Title : Dynamics of Ca2+-calmodulin-dependent inhibition of rod cyclic nucleotide-gated channels measured by patch-clamp fluorometry.

Pub. Date : 2004 Sep

PMID : 15314069






4 Functional Relationships(s)
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1 The molecular basis for Ca(2+)/CaM inhibition of rod CNG channels has been proposed to involve the binding of Ca(2+)/CaM to a site in the NH(2)-terminal region of the CNGB1 subunit, which disrupts an interaction between the NH(2)-terminal region of CNGB1 and the COOH-terminal region of CNGA1. cafestol palmitate cyclic nucleotide gated channel subunit alpha 1 Homo sapiens
2 The molecular basis for Ca(2+)/CaM inhibition of rod CNG channels has been proposed to involve the binding of Ca(2+)/CaM to a site in the NH(2)-terminal region of the CNGB1 subunit, which disrupts an interaction between the NH(2)-terminal region of CNGB1 and the COOH-terminal region of CNGA1. cafestol palmitate cyclic nucleotide gated channel subunit alpha 1 Homo sapiens
3 Here, we test this mechanism for Ca(2+)/CaM-dependent inhibition of CNGA1/CNGB1 channels by simultaneously monitoring protein interactions with fluorescence spectroscopy and channel function with patch-clamp recording. cafestol palmitate cyclic nucleotide gated channel subunit alpha 1 Homo sapiens
4 Further, we show that the NH(2)- and COOH-terminal regions of CNGB1 and CNGA1 subunits, respectively, are in close proximity, and that Ca(2+)/CaM binding causes a relative rearrangement or separation of these regions. cafestol palmitate cyclic nucleotide gated channel subunit alpha 1 Homo sapiens