PRMT3 inhibits ubiquitination of ribosomal protein S2 and together forms an active enzyme complex

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Title
PRMT3 inhibits ubiquitination of ribosomal protein S2 and together forms an active enzyme complex
Author(s)
See Young Choi; Cho-Rok Jung; J Y Kim; Dong Soo Im
Bibliographic Citation
Biochimica et Biophysica Acta-General Subjects, vol. 1780, no. 9, pp. 1062-1069
Publication Year
2008
Abstract
Protein arginine methyltransferase 3 (PRMT3) comprises a region not required for catalytic activity in its amino-terminus and the core domain catalyzing protein arginine methylation. PRMT3 has been shown to interact with the 40S ribosomal protein S2 (rpS2) and methylate arginine residues in the arginine-glycine (RG) repeat region in the amino-terminus of rpS2. We investigated the biological implications of this interaction by delineating the domains that mediate binding between PRMT3 and rpS2. The rpS2 (100-293 amino acids) domain, but not the amino-terminus of rpS2 that includes the RG repeat region was essential for binding to PRMT3 and was susceptible to degradation. The amino-terminus of PRMT3, but not its catalytic core was required for binding to and the stability of rpS2. Overexpressed rpS2 was ubiquitinated in cells, but expression of PRMT3 reduced this ubiquitination and stabilized the rpS2 protein. Recombinant PRMT3 formed an active enzyme complex with endogenous rpS2 in vitro. Recombinant rpS2 in molar excess modestly increased the enzymatic activity of PRMT3 in vitro. Our results suggest that in addition to its catalytic function, PRMT3 may control the level of rpS2 protein in cells by inhibiting ubiquitin-mediated proteolysis of rpS2, while rpS2 may regulate the enzymatic activity of PRMT3 as a likely non-catalytic subunit.
Keyword
arginine methylationPRMT3ribosomal protein S2ubiquitin-proteasome
ISSN
0304-4165
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.bbagen.2008.05.010
Type
Article
Appears in Collections:
Division of Research on National Challenges > Stem Cell Convergenece Research Center > 1. Journal Articles
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