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Disease-associated Kv1.3 Variants are Energy Compromised with Impaired Nascent Chain Folding.

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KCNA3 gene variants impact Kv1.3 ion channel biogenesis by causing folding defects in the T1 domain. These molecular mechanisms may explain diverse chronic inflammatory and autoimmune disease phenotypes.

Keywords:
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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • Protein folding is crucial for cellular function, especially for complex structures like ion channels.
  • The human Kv1.3 ion channel (KCNA3) is vital in neuronal and immune cells, with dysregulation linked to chronic inflammatory and autoimmune diseases.
  • Understanding genetic variants affecting Kv1.3 biogenesis is critical for disease mechanism elucidation.

Purpose of the Study:

  • To identify KCNA3 gene variants associated with human disease.
  • To investigate the impact of these variants on Kv1.3 ion channel biogenesis and folding.
  • To elucidate the molecular mechanisms linking genetic variations to disease phenotypes.

Main Methods:

  • Genome-first approach utilizing integrated patient biobank databases.
  • Tertiary and quaternary protein folding assays.
  • All-atom molecular dynamics simulations.

Main Results:

  • Identified KCNA3 gene variants linked to human disease.
  • Demonstrated that variants in the T1 domain cause early-stage T1 folding defects.
  • Observed energetic instabilities and conformational distortion of subunits, including tertiary unwinding.

Conclusions:

  • KCNA3 variants in the T1 domain disrupt Kv1.3 ion channel assembly.
  • These folding defects provide molecular insights into disease pathogenesis.
  • The study links specific genetic variations to complex clinical phenotypes in inflammatory and autoimmune disorders.