An Allosteric Inhibitor of Protein Arginine Methyltransferase 3

作者:Siarheyeva Alena; Senisterra Guillermo; Allali Hassani Abdellah; Dong Aiping; Dobrovetsky Elena; Wasney Gregory A; Chau Irene; Marcellus Richard; Hajian Taraneh; Liu Feng; Korboukh Ilia; Smil David; Bolshan Yuri; Min Jinrong; Wu Hong; Zeng Hong; Loppnau Peter; Poda Gennadiy; Griffin Carly; Aman Ahmed; Brown Peter J; Jin Jian; Al awar Rima; Arrowsmith Cheryl H; Schapira Matthieu*; Vedadi Masoud
来源:Structure, 2012, 20(8): 1425-1435.
DOI:10.1016/j.str.2012.06.001

摘要

PRMT3, a protein arginine methyltransferase, has been shown to influence ribosomal biosynthesis by catalyzing the dimethylation of the 40S ribosomal protein S2. Although PRMT3 has been reported to be a cytosolic protein, it has been shown to methylate histone H4 peptide (H4 1-24) in vitro. Here, we report the identification of a PRMT3 inhibitor (1-(benzo[d][1,2,3]thiadiazol-6-yl)-3-(2-cyclohexeny-lethyl)urea; compound 1) with IC50 value of 2.5 mu M by screening a library of 16,000 compounds using H4 (1-24) peptide as a substrate. The crystal structure of PRMT3 in complex with compound 1 as well as kinetic analysis reveals an allosteric mechanism of inhibition. Mutating PRMT3 residues within the allosteric site or using compound 1 analogs that disrupt interactions with allosteric site residues both abrogated binding and inhibitory activity. These data demonstrate an allosteric mechanism for inhibition of protein arginine methyltransferases, an emerging class of therapeutic targets.

  • 出版日期2012-8-8