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Catalog No.
Potent MGMT inhibitor
Grouped product items
SizePriceStock Qty
10mM (in 1mL DMSO)
In stock
In stock
In stock
In stock

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O6-Benzylguanine (BG) is a potent inhibitor of MGMT and an antineoplastic agent [1].

O6-methylguanine DNA methyltransferase (MGMT, also known as O6-Alkylguanine-DNA alkyltransferase, or AGT) is a DNA repair protein that removes the alkyl group located on the O6-position of guanine from DNA and restores DNA integrity. MGMT is alkylated and irreversibly inactivated.

O6-Benzylguanine is a potent MGMT inhibitor. In HT29 cells, O6-Benzylguanine significantly reduced MGMT stability and the affinity of MGMT for DNA, increased its sensitivity to proteases. O6-Benzylguanine also increased the cytotoxic effect of alkylating agent BCNU [1]. In SF767 cells, BG (25 μM for 1 h) reduced >95% of MGMT activity, while 33% of the activity recovered within 24 h. When cells pretreated with BG (2.5 μM for 24 h) followed by the same low-dose treatment for 24 h completely depleted MGMT activity [2]. In HCT116 and HCT15 cells, treatment with BG and BCNU inactivated MGMT and arrested 70-80% of cells in G2/M phase in response to the DNA damages induced by BCNU [3].

In nude mice bearing SF767 human brain tumor xenografts, treatment with O6-Benzylguanine prior to BCNU significantly inhibited tumor growth as compared to BCNU alone [1]. In xenograft SF767 tumors, pre- and post-treatments (8 mg/kg over 24 h) combined with an i.p. bolus dose (80 mg/kg) of BG inhibited >95% of MGMT activity [2].

[1].  Dolan ME, Pegg AE. O6-benzylguanine and its role in chemotherapy. Clin Cancer Res, 1997, 3(6): 837-847.
[2].  Kreklau EL, Kurpad C, Williams DA, et al. Prolonged inhibition of O(6)-methylguanine DNA methyltransferase in human tumor cells by O(6)-benzylguanine in vitro and in vivo. J Pharmacol Exp Ther, 1999, 291(3): 1269-1275.
[3].  Yan L, Donze JR, Liu L. Inactivated MGMT by O6-benzylguanine is associated with prolonged G2/M arrest in cancer cells treated with BCNU. Oncogene, 2005, 24(13): 2175-2183.

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.19916-73-5
Solubility≥11.3mg/mL in Ethano with gentle warming
Chemical Name6-(benzyloxy)-9H-purin-2-amine
SDFDownload SDF
Canonical SMILES[H]N1C2=NC(N)=NC(OCC3=CC=CC=C3)=C2N=C1
Shipping ConditionEvaluation sample solution : ship with blue ice.All other available size: ship with RT , or blue ice upon request
General tipsFor obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.

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