Published online 16 December 2002. doi:10.1083/jcb.200207028
© The Rockefeller University Press,
0021-9525/2002/12/957 $5.00
The Journal of Cell Biology, Volume 159, Number 6, 957-969
Symmetrical dimethylarginine methylation is required for the localization of SMN in Cajal bodies and pre-mRNA splicing
François-Michel Boisvert1,2,
Jocelyn Côté1,2,
Marie-Chloé Boulanger1,2,
Patrick Cléroux1,2,
François Bachand2,3,
Chantal Autexier2,3 and
Stéphane Richard1,2,4
1 Terry Fox Molecular Oncology Group, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis Jewish General Hospital, Montréal, Québec, Canada H3T 1E2
2 Bloomfield Center for Research on Aging, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis Jewish General Hospital, Montréal, Québec, Canada H3T 1E2
3 Department of Anatomy and Cell Biology, Medicine, Microbiology, and Immunology, McGill University, Montréal, Québec, Canada H3T 1E2
4 Departments of Oncology, Medicine, Microbiology, and Immunology, McGill University, Montréal, Québec, Canada H3T 1E2
Address correspondence to Stéphane Richard, Lady Davis Institute, 3755 Côte Ste-Catherine Rd., Montréal, Québec, Canada H3T 1E2. Tel.: (514) 340-8260. Fax: (514) 340-8295. E-mail: stephane.richard{at}mcgill.ca
The nuclear structures that contain symmetrical dimethylated arginine (sDMA)modified proteins and the role of this posttranslational modification is unknown. Here we report that the Cajal body is a major epitope in HeLa cells for an sDMA-specific antibody and that coilin is an sDMA-containing protein as analyzed by using the sDMA-specific antibody and matrix-assisted laser desorption ionization time of flight mass spectrometry. The methylation inhibitor 5'-deoxy-5'-methylthioadenosine reduces the levels of coilin methylation and causes the appearance of SMN-positive gems. In cells devoid of Cajal bodies, such as primary fibroblasts, sDMA-containing proteins concentrated in speckles. Cells from a patient with spinal muscular atrophy, containing low levels of the methyl-binding protein SMN, localized sDMA-containing proteins in the nucleoplasm as a discrete granular pattern. Splicing reactions are efficiently inhibited by using the sDMA-specific antibody or by using hypomethylated nuclear extracts, showing that active spliceosomes contain sDMA polypeptides and suggesting that arginine methylation is important for efficient pre-mRNA splicing. Our findings support a model in which arginine methylation is important for the localization of coilin and SMN in Cajal bodies.
Key Words: PRMT5; Cajal; SMN; arginine methylation; splicing

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