A potent, selective and cell-active allosteric inhibitor of protein arginine methyltransferase 3 (PRMT3).
PRMT3 catalyzes the asymmetric dimethylation of arginine residues of various proteins. It is essential for maturation of ribosomes, may have a role in lipogenesis, and is implicated in several diseases. A potent, selective, and cell-active PRMT3 inhibitor would be a valuable tool for further investigating PRMT3 biology. Here we report the discovery of the first PRMT3 chemical probe, SGC707, by structure-based optimization of the allosteric PRMT3 inhibitors we reported previously, and thorough characterization of this probe in biochemical, biophysical, and cellular assays. SGC707 is a potent PRMT3 inhibitor (IC50 =31±2 nM, KD =53±2 nM) with outstanding selectivity (selective against 31 other methyltransferases and more than 250 non-epigenetic targets). The mechanism of action studies and crystal structure of the PRMT3-SGC707 complex confirm the allosteric inhibition mode. Importantly, SGC707 engages PRMT3 and potently inhibits its methyltransferase activity in cells. It is also bioavailable and suitable for animal studies. This well-characterized chemical probe is an excellent tool to further study the role of PRMT3 in health and disease.
Departments of Structural and Chemical Biology, Oncological Sciences, and Pharmacology and System Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY 10029 (USA).
H Ümit
HÜ
Kaniskan
Magdalena M
MM
Szewczyk
Zhengtian
Z
Yu
Mohammad S
MS
Eram
Xiaobao
X
Yang
Keith
K
Schmidt
Xiao
X
Luo
Miao
M
Dai
Feng
F
He
Irene
I
Zang
Ying
Y
Lin
Steven
S
Kennedy
Fengling
F
Li
Elena
E
Dobrovetsky
Aiping
A
Dong
David
D
Smil
Sun-Joon
SJ
Min
Melissa
M
Landon
Jennifer
J
Lin-Jones
Xi-Ping
XP
Huang
Bryan L
BL
Roth
Matthieu
M
Schapira
Peter
P
Atadja
Dalia
D
Barsyte-Lovejoy
Cheryl H
CH
Arrowsmith
Peter J
PJ
Brown
Kehao
K
Zhao
Jian
J
Jin
Masoud
M
Vedadi
D000494:Allosteric Regulation; D001665:Binding Sites; D002151:Calorimetry; D045744:Cell Line, Tumor; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000378:metabolism; D057809:HEK293 Cells; D006657:Histones; D006801:Humans; D007546:Isoquinolines / Q000737:chemistry* / Q000378:metabolism; D008745:Methylation; D056004:Molecular Dynamics Simulation; D016296:Mutagenesis; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011484:Protein-Arginine N-Methyltransferases / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D020349:Surface Plasmon Resonance
D004791:Enzyme Inhibitors; D006657:Histones; D007546:Isoquinolines; C000604132:SGC707; C413164:PRMT3 protein, human; D011484:Protein-Arginine N-Methyltransferases
X-ray diffraction; allosteric inhibition; chemical probes; enzyme inhibitors; histone methylation