AtVPS34, a phosphatidylinositol 3-kinase of Arabidopsis thaliana, is an essential protein with homology to a calcium-dependent lipid binding domain Academic Article Article uri icon


MeSH Major

  • Endosomes
  • Phosphatidylinositol 3-Kinases


  • The cDNA encoding phosphatidylinositol (PI) 3-kinase was cloned from Arabidopsis thaliana, and the derived amino acid sequence (AtVPS34) has a significantly higher homology to yeast PI 3-kinase (VPS34) than to the mammalian (p110). The protein has two conserved domains: a catalytic site with the ATP-binding site near the C terminus and a calcium-dependent lipid-binding domain near the N terminus. The plant cDNA does not rescue a yeast vps34 deletion mutant, but a chimeric gene in which the coding sequence for the C-terminal third of VPS34 is replaced by the corresponding sequence from the plant gene does rescue the yeast mutant. PI 3-kinase activity is detectable in extracts from plants that overexpress the plant PI 3-kinase. Expression of antisense constructs gives rise to second-generation transformed plants severely inhibited in growth and development.

publication date

  • November 22, 1994



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1073/pnas.91.24.11398

PubMed ID

  • 7972072

Additional Document Info

start page

  • 11398

end page

  • 402


  • 91


  • 24