title: PRMT8, a new membrane-bound tissue-specific member of the protein arginine methyltransferase family.
abstract: Protein arginine methylation is a common post-translational modification that has been implicated in signal transduction, RNA processing, transcriptional regulation, and DNA repair. A search of the human genome for additional members of the protein arginine N-methyltransferase (PRMT) family of enzymes has identified a gene on chromosome 12 that we have termed PRMT8. This novel enzyme is most closely related to PRMT1, although it has a distinctive N-terminal region. The unique N-terminal end harbors a myristoylation motif, and we have shown here that PRMT8 is indeed modified by the attachment of a myristate to the glycine residue after the initiator methionine. The myristoylation of PRMT8 results in its association with the plasma membrane. The second singular property of PRMT8 is its tissue-specific expression pattern; it is largely expressed in the brain. A glutathione S-transferase fusion protein of PRMT8 has type I PRMT activity, catalyzing the formation of omega-NG-monomethylated and asymmetrically omega-NG,NG-dimethylated arginine residues on a recombinant glycine- and arginine-rich substrate. PRMT8 is thus an active arginine methyltransferase that is membrane-associated and tissue-specific, two firsts for this family of enzymes.
authors.affiliation: Science Park-Research Division, The University of Texas M. D. Anderson Cancer Center, Smithville, Texas 78957, USA.
authors.forename: Jaeho
authors.initials: J
authors.lastname: Lee
authors.forename: Joyce
authors.initials: J
authors.lastname: Sayegh
authors.forename: Jeremy
authors.initials: J
authors.lastname: Daniel
authors.forename: Steven
authors.initials: S
authors.lastname: Clarke
authors.forename: Mark T
authors.initials: MT
authors.lastname: Bedford
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D001120:Arginine / Q000737:chemistry; D015152:Blotting, Northern; D001921:Brain / Q000201:enzymology / Q000378:metabolism; D002384:Catalysis; D002462:Cell Membrane / Q000201:enzymology*; D019281:Dimerization; D015971:Gene Expression Regulation, Enzymologic; D005982:Glutathione Transferase / Q000378:metabolism; D005998:Glycine / Q000737:chemistry; D049452:Green Fluorescent Proteins / Q000737:chemistry; D006367:HeLa Cells; D006801:Humans; D047468:Immunoprecipitation; D008565:Membrane Proteins / Q000096:biosynthesis* / Q000502:physiology*; D018613:Microscopy, Confocal; D008969:Molecular Sequence Data; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D011484:Protein-Arginine N-Methyltransferases / Q000096:biosynthesis* / Q000502:physiology*; D012313:RNA / Q000737:chemistry / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D014018:Tissue Distribution; D014158:Transcription, Genetic
chemical_list: D008565:Membrane Proteins; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins; D012313:RNA; D001120:Arginine; C505447:PRMT8 protein, human; D011484:Protein-Arginine N-Methyltransferases; D005982:Glutathione Transferase; D005998:Glycine