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KCNE1 and KCNE3 subunits distinctly alter KCNQ1 potassium channel gating. KCNE3 creates a GPCR-regulated, voltage-insensitive channel, while KCNE1 forms a voltage-gated channel crucial for cardiac function.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Physiology

Background:

  • KCNQ1 potassium channels are vital for heart rhythm and intestinal function.
  • KCNE subunits (KCNE1-5) modify KCNQ1 channel properties.
  • KCNQ1 gating depends on voltage and PIP2, influenced by GPCR signaling.

Purpose of the Study:

  • To elucidate how KCNE1 and KCNE3 subunits modulate KCNQ1 channel gating.
  • To investigate the structural basis for KCNE1/3 effects on KCNQ1's voltage and PIP2-dependent activation.
  • To understand the distinct roles of KCNQ1-KCNE1 and KCNQ1-KCNE3 complexes in different cell types.

Main Methods:

  • X-ray crystallography to resolve KCNQ1-KCNE1 complex structures.
  • Reassessment of existing KCNQ1-KCNE3 structures with and without PIP2.
  • Functional analysis of PIP2-dependent gating and GPCR modulation.

Main Results:

  • KCNQ1-KCNE1/3 complexes possess two PIP2-binding sites, including a novel site involving voltage sensor-pore domain coupling residues.
  • KCNE1 and KCNE3 differentially modulate KCNQ1's PIP2-dependent gating and voltage sensitivity.
  • KCNE3 transforms KCNQ1 into a voltage-insensitive, PIP2-gated channel regulated by GPCRs.
  • KCNE1 enhances KCNQ1's PIP2 affinity and GPCR resistance, forming voltage-gated channels for cardiac function.

Conclusions:

  • KCNE1 and KCNE3 subunits impart distinct gating properties to KCNQ1 channels through unique structural interactions.
  • KCNE3 enables GPCR-mediated regulation of KCNQ1 in non-excitable cells for ion homeostasis.
  • KCNE1 promotes voltage-gated KCNQ1 function in cardiac cells, regulating the slow-delayed rectifier current.
  • Understanding these KCNE1/3-KCNQ1 interactions offers insights for tissue-specific channel targeting.