Unusual Sites of Arginine Methylation in Poly(A)-binding Protein II and in Vitro Methylation by Protein Arginine Methyltransferases PRMT1 and PRMT3

doi:10.1074/jbc.274.19.13229

Unusual Sites of Arginine Methylation in Poly(A)-binding Protein II and in Vitro Methylation by Protein Arginine Methyltransferases PRMT1 and PRMT3*

From the ^‡Institut für Biochemie, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany,^§Institut für Biochemie, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany,^¶Max-Planck-Forschungsstelle für Enzymologie der Proteinfaltung, 06120 Halle, Germany, ^‖Molecular Biology Institute, Department of Biological Chemistry, UCLA, Los Angeles, California 90095, and ^‡Biochemisches Institut, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany

Abstract

Arginine methylation is a post-translational modification found mostly in RNA-binding proteins. Poly(A)-binding protein II from calf thymus was shown by mass spectrometry and sequencing to containN ^G,N ^G-dimethylarginine at 13 positions in its amino acid sequence. Two additional arginine residues were partially methylated. Almost all of the modified residues were found in Arg-Xaa-Arg clusters in the C terminus of the protein. These motifs are distinct from Arg-Gly-Gly motifs that have been previously described as sites and specificity determinants for asymmetric arginine dimethylation. Poly(A)-binding protein II and deletion mutants expressed in Escherichia coli werein vitro substrates for two mammalian protein arginine methyltransferases, PRMT1 and PRMT3, withS-adenosyl-l-methionine as the methyl group donor. Both PRMT1 and PRMT3 specifically methylated arginines in the C-terminal domain corresponding to the naturally modified sites.

Footnotes

↵* This work was supported by the Training and Mobility of Researchers program of the European Union, the Deutsche Forschungsgemeinschaft, the Fonds der Chemischen Industrie (to E. W.), and National Institutes of Health Grants GM24797 and AI34567 (to H. H. and J. T.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
↵** A postdoctoral trainee supported by USPHS Institutional National Research Service Award T32 CA09056.
↵§§ To whom correspondence should be addressed: Institut für Biochemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Strasse 3, 06120 Halle, Germany. Tel.: 49-345-55-24920; Fax: 49-345-55-27014; E-mail: ewahle{at}biochemtech.uni-halle.de.
↵1 PABP2 was formerly termed PABII. The name PABP2 has now been adopted from the human genome project nomenclature (48).
↵3 A. Nemeth, U. Kühn, and E. Wahle, unpublished data.
Abbreviations:

RNP

ribonucleoprotein

DMA

dimethylarginine

GST

glutathioneS-transferase

MALDI-TOF-MS

matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

MMA

monomethylarginine

PABP2

poly(A)-binding protein II

PRMT

protein arginine methyltransferase

HPLC

high performance liquid chromatography
- Received January 25, 1999.
The American Society for Biochemistry and Molecular Biology, Inc.