An allosteric inhibitor of protein arginine methyltransferase 3.
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-cyclohexenylethyl)urea; compound 1) with IC50 value of 2.5 μM 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.
Structural Genomics Consortium, University of Toronto, 101 College Street, MaRS Centre, South Tower, Toronto, ON M5G 1L7, Canada.
Alena
A
Siarheyeva
Guillermo
G
Senisterra
Abdellah
A
Allali-Hassani
Aiping
A
Dong
Elena
E
Dobrovetsky
Gregory A
GA
Wasney
Irene
I
Chau
Richard
R
Marcellus
Taraneh
T
Hajian
Feng
F
Liu
Ilia
I
Korboukh
David
D
Smil
Yuri
Y
Bolshan
Jinrong
J
Min
Hong
H
Wu
Hong
H
Zeng
Peter
P
Loppnau
Gennadiy
G
Poda
Carly
C
Griffin
Ahmed
A
Aman
Peter J
PJ
Brown
Jian
J
Jin
Rima
R
Al-Awar
Cheryl H
CH
Arrowsmith
Matthieu
M
Schapira
Masoud
M
Vedadi
D000494:Allosteric Regulation; D000495:Allosteric Site; D019943:Amino Acid Substitution; D018938:Caco-2 Cells; D020134:Catalytic Domain; D002463:Cell Membrane Permeability; D018360:Crystallography, X-Ray; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D006860:Hydrogen Bonding; D007700:Kinetics; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism; D008958:Models, Molecular; D016297:Mutagenesis, Site-Directed; D011485:Protein Binding; D017433:Protein Structure, Secondary; D011484:Protein-Arginine N-Methyltransferases / Q000037:antagonists & inhibitors* / Q000737:chemistry* / Q000235:genetics; D013329:Structure-Activity Relationship; D013830:Thiadiazoles / Q000737:chemistry* / Q000378:metabolism; D014508:Urea / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism
C576979:1-(benzo(d)(1,2,3)thiadiazol-6-yl)-3-(2-cyclohexenylethyl)urea; D004791:Enzyme Inhibitors; D013830:Thiadiazoles; D014508:Urea; C413164:PRMT3 protein, human; D011484:Protein-Arginine N-Methyltransferases