6cnn
Cryo-EM structure of the human SK4/calmodulin channel complex in the Ca2+ bound state I
Structural highlights
DiseaseKCNN4_HUMAN The disease is caused by mutations affecting the gene represented in this entry. FunctionKCNN4_HUMAN Forms a voltage-independent potassium channel that is activated by intracellular calcium (PubMed:26148990). Activation is followed by membrane hyperpolarization which promotes calcium influx. Required for maximal calcium influx and proliferation during the reactivation of naive T-cells. The channel is blocked by clotrimazole and charybdotoxin but is insensitive to apamin (PubMed:17157250, PubMed:18796614).[1] [2] [3] Publication Abstract from PubMedSmall-conductance Ca(2+)-activated K(+) (SK) channels mediate neuron excitability and are associated with synaptic transmission and plasticity. They also regulate immune responses and the size of blood cells. Activation of SK channels requires calmodulin (CaM), but how CaM binds and opens SK channels has been unclear. Here we report cryo-electron microscopy (cryo-EM) structures of a human SK4-CaM channel complex in closed and activated states at 3.4- and 3.5-angstrom resolution, respectively. Four CaM molecules bind to one channel tetramer. Each lobe of CaM serves a distinct function: The C-lobe binds to the channel constitutively, whereas the N-lobe interacts with the S4-S5 linker in a Ca(2+)-dependent manner. The S4-S5 linker, which contains two distinct helices, undergoes conformational changes upon CaM binding to open the channel pore. These structures reveal the gating mechanism of SK channels and provide a basis for understanding SK channel pharmacology. Activation mechanism of a human SK-calmodulin channel complex elucidated by cryo-EM structures.,Lee CH, MacKinnon R Science. 2018 May 4;360(6388):508-513. doi: 10.1126/science.aas9466. PMID:29724949[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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