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• W3013783484 endingPage "e1007530" @default.
• W3013783484 startingPage "e1007530" @default.
• W3013783484 abstract "This work reports a dynamical Markov state model of CLC-2 “fast” (pore) gating, based on 600 microseconds of molecular dynamics (MD) simulation. In the starting conformation of our CLC-2 model, both outer and inner channel gates are closed. The first conformational change in our dataset involves rotation of the inner-gate backbone along residues S168-G169-I170. This change is strikingly similar to that observed in the cryo-EM structure of the bovine CLC-K channel, though the volume of the intracellular (inner) region of the ion conduction pathway is further expanded in our model. From this state (inner gate open and outer gate closed), two additional states are observed, each involving a unique rotameric flip of the outer-gate residue GLUex. Both additional states involve conformational changes that orient GLUex away from the extracellular (outer) region of the ion conduction pathway. In the first additional state, the rotameric flip of GLUex results in an open, or near-open, channel pore. The equilibrium population of this state is low (∼1%), consistent with the low open probability of CLC-2 observed experimentally in the absence of a membrane potential stimulus (0 mV). In the second additional state, GLUex rotates to occlude the channel pore. This state, which has a low equilibrium population (∼1%), is only accessible when GLUex is protonated. Together, these pathways model the opening of both an inner and outer gate within the CLC-2 selectivity filter, as a function of GLUex protonation. Collectively, our findings are consistent with published experimental analyses of CLC-2 gating and provide a high-resolution structural model to guide future investigations." @default.
• W3013783484 created "2020-04-03" @default.
• W3013783484 creator A5011355274 @default.
• W3013783484 creator A5032418986 @default.
• W3013783484 creator A5077583656 @default.
• W3013783484 creator A5084403209 @default.
• W3013783484 date "2020-03-30" @default.
• W3013783484 modified "2023-09-25" @default.
• W3013783484 title "Dynamical model of the CLC-2 ion channel reveals conformational changes associated with selectivity-filter gating" @default.
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