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Originally published In Press as doi:10.1074/jbc.M000300200 on March 19, 2000
J. Biol. Chem., Vol. 275, Issue 22, 17122-17129, June 2, 2000
The C-terminal RG Dipeptide Repeats of the Spliceosomal Sm
Proteins D1 and D3 Contain Symmetrical Dimethylarginines, Which Form a
Major B-cell Epitope for Anti-Sm Autoantibodies*
Hero
Brahms §,
Jos
Raymackers¶,
Ann
Union¶,
Filip
de
Keyser ,
Lydie
Meheus¶**, and
Reinhard
Lührmann §**
From the Institut für Molekularbiologie und
Tumorforschung, Emil-Mannkopff-Str. 2, D-35037 Marburg, Germany, the
§ Max-Planck-Institute of Biophysical Chemistry, Department
of Cellular Biochemistry, Am Faßberg 11, D-37070 Göttingen,
Germany, ¶ Innogenetics N.V., Industriepark Zwijnaarde 7, Box 4, B-9052 Ghent, Belgium, and the Department of Rheumatology, Ghent
University Hospital, B-9000 Ghent, Belgium
The Sm proteins B/B', D1, D2, D3, E, F, and G are
components of the small nuclear ribonucleoproteins U1, U2, U4/U6, and
U5 that are essential for the splicing of pre-mRNAs in eukaryotes. D1 and D3 are among the most common antigens recognized by anti-Sm autoantibodies, an autoantibody population found exclusively in patients afflicted with systemic lupus erythematosus. Here we demonstrate by protein sequencing and mass spectrometry that all arginines in the C-terminal arginine-glycine (RG) dipeptide repeats of
the human Sm proteins D1 and D3, isolated from HeLa small nuclear ribonucleoproteins, contain symmetrical dimethylarginines (sDMAs), a
posttranslational modification thus far only identified in the myelin basic protein. The further finding that human D1 individually overexpressed in baculovirus-infected insect cells contains
asymmetrical dimethylarginines suggests that the symmetrical
dimethylation of the RG repeats in D1 and D3 is dependent on the
assembly status of D1 and D3. In antibody binding studies, 10 of 11 anti-Sm patient sera tested, as well as the monoclonal antibody Y12,
reacted with a chemically synthesized C-terminal peptide of D1
containing sDMA, but not with peptides containing asymmetrically
modified or nonmodified arginines. These results thus demonstrate that
the sDMA-modified C terminus of D1 forms a major linear epitope for
anti-Sm autoantibodies and Y12 and further suggest that
posttranslational modifications of Sm proteins play a role in the
etiology of systemic lupus erythematosus.
*
This work was supported in part by a grant from the Deutsche
Forschungsgemeinschaft (to R. L.).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.
**
To whom correspondence and reprint requests may be addressed: Lydie
Meheus, Innogenetics N.V., Industriepark Zwijnaarde 7, Box 4, B-9052
Ghent, Belgium. Tel.: 32-9-2410711; Fax: 32-9-2410907; E-mail:
Lydie_Meheus@innogenetics.com or Reinhard Luhrmann, Tel.: 49-551-2011407; Fax: 49-551-2011197; E-mail:
R.Luehrmann@gwdg.de.
Copyright © 2000 by The American Society for Biochemistry and Molecular Biology, Inc.

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The spliceosomal snRNP core complex of Trypanosoma brucei: Cloning and functional analysis reveals seven Sm protein constituents
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The crystal structure of a heptameric archaeal Sm protein: Implications for the eukaryotic snRNP core
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Copyright © 2000 by the American Society for Biochemistry and Molecular Biology.
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