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Related Experiment Videos

Structure-function relationships in the beta-cell K(ATP) channel.

M V Mikhailov1, E A Mikhailova, S J Ashcroft

  • 1Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, Headington, Oxford OX3 9DU, U.K.

Biochemical Society Transactions
|May 25, 2002
PubMed
Summary
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The ATP-sensitive potassium (K(ATP)) channel

Area of Science:

  • Molecular biology
  • Biophysics
  • Cell physiology

Background:

  • ATP-sensitive potassium (K(ATP)) channels regulate beta-cell membrane potential and insulin secretion.
  • These channels consist of Kir6.2 pore-forming subunits and SUR1 regulatory subunits.

Purpose of the Study:

  • To delineate molecular interactions in K(ATP) channel assembly and ligand binding.
  • To propose a structural model for the K(ATP) channel based on experimental data.

Main Methods:

  • Utilized a complementation approach co-expressing SUR1 half-molecules in insect cells via a baculovirus system.
  • Analyzed data from truncated SUR1 molecules and a SUR1-Kir6.2 fusion protein.

Main Results:

  • Proposed a model where SUR1 C-terminus interacts with Kir6.2 N-terminus.

Related Experiment Videos

  • Identified proximity of SUR1 nucleotide binding domains (NBDs) and homomeric NBD1 interactions.
  • Determined glibenclamide binding site formation involves cytosolic loops CL3 and CL8.

    • Conclusions:

    • Glibenclamide binding induces conformational changes in SUR1, affecting transmembrane helices.
    • These changes transmit to Kir6.2, leading to K(ATP) channel closure.
    • The proposed model provides insights into K(ATP) channel structure and function.