Exploring the Viral Channel Kcv(PBCV-1) Function via Computation

• Viral potassium channels (Kcv) are homologous to the pore module of complex -selective ion channels of cellular organisms. Due to their relative simplicity, they have attracted interest towards understanding the principles of conduction and channel gating. In this work, we construct a homology model of the open state, which we validate by studying the binding of known blockers and by monitoring ion conduction through the channel. Molecular dynamics simulations of this model reveal that the re-orientation of selectivity filter carbonyl groups coincides with the transport of potassium ions, suggesting a possible mechanism for fast gating. In addition, we show that the voltage sensitivity of this mechanism can originate from the relocation of potassium ions inside the selectivity filter. We also explore the interaction of with the surrounding bilayer and observe the binding of lipids in the area between two adjacent subunits. The model is available to the scientific community to further explore the structure/function relationship of Kcv channels.

Subject headings

NATURVETENSKAP  -- Biologi -- Biofysik (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Biophysics (hsv//eng)

Keyword

Viral ion channel

Homology modeling

Molecular dynamics simulations

Gating

Conduction

Protein-lipid interaction

Publication and Content Type

ref (subject category)

art (subject category)