Effects of human T-cell leukemia virus type 1 (HTLV-1) p13 on mitochondrial K+ permeability: A new member of the viroporin family?

FEBS Lett. 2010 May 17;584(10):2070-5. doi: 10.1016/j.febslet.2010.02.030. Epub 2010 Feb 17.


Human T-cell leukemia virus type-1 (HTLV-1) encodes a mitochondrial protein named p13. p13 mediates an inward K(+) current in isolated mitochondria that leads to mitochondrial swelling, depolarization, increased respiratory chain activity and reactive oxygen species (ROS) production. These effects trigger the opening of the permeability transition pore and are dependent on the presence of K(+) and on the amphipathic alpha helical domain of p13. In the context of cells, p13 acts as a sensitizer to selected apoptotic stimuli. Although it is not known whether p13 influences the activity of endogenous K(+) channels or forms a channel itself, it shares some structural and functional analogies with viroporins, a class of small integral membrane proteins that form pores and alter membrane permeability.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Cell Transformation, Viral / drug effects
  • Human T-lymphotropic virus 1*
  • Humans
  • Mitochondria / drug effects*
  • Mitochondria / metabolism*
  • Molecular Sequence Data
  • Permeability / drug effects
  • Potassium / metabolism*
  • Retroviridae Proteins / chemistry
  • Retroviridae Proteins / metabolism
  • Retroviridae Proteins / pharmacology*


  • Retroviridae Proteins
  • rof protein, Human T-lymphotropic virus 1
  • Potassium