AtVPS34, a phosphatidylinositol 3-kinase of Arabidopsis thaliana, is an essential protein with homology to a calcium-dependent lipid binding domain.
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.
Department of Biology, University of California, San Diego, La Jolla 92093-0016.
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Welters
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Takegawa
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Emr
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MJ
Chrispeels
D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000201:enzymology*; D002118:Calcium / Q000378:metabolism; D003001:Cloning, Molecular; D019204:GTP-Binding Proteins / Q000737:chemistry; D015870:Gene Expression; D017343:Genes, Plant; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry; D019869:Phosphatidylinositol 3-Kinases; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000737:chemistry / Q000235:genetics*; D030821:Plants, Genetically Modified; D016372:RNA, Antisense; D012333:RNA, Messenger / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D033921:Vesicular Transport Proteins; D020691:rab GTP-Binding Proteins; D000097624:Rabphilin-3A
D048868:Adaptor Proteins, Signal Transducing; D002118:Calcium; D019204:GTP-Binding Proteins; D009419:Nerve Tissue Proteins; D019869:Phosphatidylinositol 3-Kinases; D017853:Phosphotransferases (Alcohol Group Acceptor); D016372:RNA, Antisense; D012333:RNA, Messenger; D033921:Vesicular Transport Proteins; D020691:rab GTP-Binding Proteins; D000097624:Rabphilin-3A