1348285-25-5Relevant academic research and scientific papers
Substitution of aminomethyl at the meta-position enhances the inactivation of O6-alkylguanine-DNA alkyltransferase by O6- benzylguanine
Pauly, Gary T.,Loktionova, Natalia A.,Fang, Qingming,Vankayala, Sai Lakshmana,Guida, Wayne C.,Pegg, Anthony E.
experimental part, p. 7144 - 7153 (2009/11/30)
O6-Benzylguanine is an irreversible inactivator of O 6-alkylguanine-DNA alkyltransferase currently in clinical trials to overcome alkyltransferase-mediated resistance to certain cancer chemotherapeutic alkylating agents. In order to produce more soluble alkyltransferase inhibitors, we have synthesized three aminomethyl-substituted O 6-benzylguanines and the three methyl analogs and found that the substitution of aminomethyl at the meta-position greatly enhances inactivation of alkyltransferase, whereas para-substitution has little effect and ortho-substitution virtually eliminates activity. Molecular modeling of their interactions with alkyltransferase provided a molecular explanation for these results. The square of the correlation coefficient (R2) obtained between E-model scores (obtained from GLIDE XP/QPLD docking calculations) vs log(ED50) values via a linear regression analysis was 0.96. The models indicate that the ortho-substitution causes a steric clash interfering with binding, whereas the meta-aminomethyl substitution allows an interaction of the amino group to generate an additional hydrogen bond with the protein.
