Structural basis for KCNE3 modulation of potassium recycling in epithelia.

Abstract:

:The single-span membrane protein KCNE3 modulates a variety of voltage-gated ion channels in diverse biological contexts. In epithelial cells, KCNE3 regulates the function of the KCNQ1 potassium ion (K(+)) channel to enable K(+) recycling coupled to transepithelial chloride ion (Cl(-)) secretion, a physiologically critical cellular transport process in various organs and whose malfunction causes diseases, such as cystic fibrosis (CF), cholera, and pulmonary edema. Structural, computational, biochemical, and electrophysiological studies lead to an atomically explicit integrative structural model of the KCNE3-KCNQ1 complex that explains how KCNE3 induces the constitutive activation of KCNQ1 channel activity, a crucial component in K(+) recycling. Central to this mechanism are direct interactions of KCNE3 residues at both ends of its transmembrane domain with residues on the intra- and extracellular ends of the KCNQ1 voltage-sensing domain S4 helix. These interactions appear to stabilize the activated "up" state configuration of S4, a prerequisite for full opening of the KCNQ1 channel gate. In addition, the integrative structural model was used to guide electrophysiological studies that illuminate the molecular basis for how estrogen exacerbates CF lung disease in female patients, a phenomenon known as the "CF gender gap."

journal_name

Sci Adv

journal_title

Science advances

authors

Kroncke BM,Van Horn WD,Smith J,Kang C,Welch RC,Song Y,Nannemann DP,Taylor KC,Sisco NJ,George AL Jr,Meiler J,Vanoye CG,Sanders CR

doi

10.1126/sciadv.1501228

subject

Has Abstract

pub_date

2016-09-09 00:00:00

pages

e1501228

issue

9

issn

2375-2548

pii

1501228

journal_volume

2

pub_type

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