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• W1969435285 startingPage "592" @default.
• W1969435285 abstract "Mammalian proteins that contain an aspartate-histidine-histidine-cysteine-(DHHC) motif have been recently identified as a group of membrane-associated palmitoyl acyltransferases (PATs). Among the several protein substrates known to become palmitoylated by DHHC PATs are small GTPases prenylated at their carboxy-terminal end, such as H-Ras or N-Ras, eNOS, kinases myristoylated at their N-terminal end, such as Lck, and many transmembrane proteins and channels. We have focused our studies on the product of the human gene DHHC19, a putative palmitoyl transferase that, interestingly, displays a conserved CaaX box at its carboxy-terminal end. We show herein that the amino acid sequence present at the carboxy-terminus of DHHC19 is able to exclude a green fluorescent protein (GFP) reporter from the nucleus and direct it towards perinuclear regions. Transfection of full-length DHHC19 in COS7 cells reveals a perinuclear distribution, in analogy to other palmitoyl transferases, with a strong colocalization with the trans-Golgi markers Gal-T and TGN38. We have tested several small GTPases that are known to be palmitoylated as possible substrates of DHHC19. Although DHHC19 failed to increase the palmitoylation of H-Ras, N-Ras, K-Ras4A, RhoB or Rap2 it increased the palmitoylation of R-Ras approximately two-fold. The increased palmitoylation of R-Ras cotransfected with DHHC19 is accompanied by an augmented association with membranes as well as with rafts/caveolae. Finally, using both wild-type and an activated GTP bound form of R-Ras (G38V), we also show that the increased palmitoylation of R-Ras due to DHHC19 coexpression is accompanied by an enhanced viability of the transfected cells." @default.
• W1969435285 created "2016-06-24" @default.
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• W1969435285 date "2010-03-01" @default.
• W1969435285 modified "2023-10-15" @default.
• W1969435285 title "Palmitoylation of R-Ras by human DHHC19, a palmitoyl transferase with a CaaX box" @default.
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• W1969435285 doi "https://doi.org/10.1016/j.bbamem.2010.01.002" @default.
• W1969435285 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20074548" @default.
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