Key result
Activating tandem K channel dimers with different thresholds reveals two subconductance levels, indicating heteromeric pores.
Why the study?
The mechanism underlying the existence of subconductance levels in voltage-gated K channels and their relation to heteromeric pore conformations was unclear.
Population
drk1 (K(v)2.1) K channels and a constructed tandem dimer linking two K channel subunits with different activation thresholds
Comparison
Depolarizations to membrane potentials between activation thresholds vs strong depolarizations
Design
Preclinical experimental study
Authors
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Hypothesis-generating for K channel heteromerization; leaves open native cardiac relevance without further validation.
This basic science study demonstrates that K channel subconductance levels result from heteromeric pore conformations, indicating that sensor movement and channel opening have a subunit basis and are allosterically coupled.
Chapman et al. (2005) studied this question. Tandem dimer linking two K channel subunits with different activation thresholds was evaluated on Single channel gating behavior and subconductance levels. Activation of a tandem dimer linking two K channel subunits with different activation thresholds elicited frequent visits to two subconductance levels, indicating heteromeric pore conformations.
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