Substitution of aminomethyl at the meta-position enhances the inactivation of O6-alkylguanine-DNA alkyltransferase by O6-benzylguanine.

Substitution of aminomethyl at the meta-position enhances the inactivation of O6-alkylguanine-DNA alkyltransferase by O6-benzylguanine.
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DOI:
10.1021/jm800675p
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发表时间:
2008-11-27
影响因子:
7.3
通讯作者:
Pegg AE
Pegg AE
中科院分区:
医学1区
文献类型:
--
作者:
Pauly GT;Loktionova NA;Fang Q;Vankayala SL;Guida WC;Pegg AE

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O6-Benzylguanine is an irreversible inactivator of O6-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 O6-benzylguanines and found that the substitution 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.
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