Enzymatic deamination of the epigenetic base N-6-methyladenine.
Enzymatic deamination of the epigenetic base N-6-methyladenine.
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DOI:
10.1021/ja110157u
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发表时间:
2011-02-23
影响因子:
15
通讯作者:
Raushel FM
中科院分区:
文献类型:
--
作者:
Kamat SS;Fan H;Sauder JM;Burley SK;Shoichet BK;Sali A;Raushel FM
Two enzymes of unknown function from the amidohydrolase superfamily were discovered to catalyze the deamination of N-6-methyladenine to hypoxanthine and methyl amine. The methylation of adenine in bacterial DNA is a common modification for the protection of host DNA against restriction endonucleases. The enzyme from Bacillus halodurans, Bh0637, catalyzes the deamination of N-6-methyladenine with a kcat of 185 s−1 and a kcat/Km of 2.5 × 106 M−1 s−1. Bh0637 catalyzes the deamination of N-6-methyladenine two orders of magnitude faster than adenine. A comparative model of Bh0637 was computed using the three-dimensional structure of Atu4426 (PDB code: 3NQB) as a structural template and computational docking was used to rationalize the preferential utilization of N-6-methyladenine over adenine. This is the first identification of an N-6-methyladenine deaminase (6-MAD).
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