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. Author manuscript; available in PMC: 2018 Jul 20.
Published in final edited form as: Enzymes. 2017 Apr 12;41:89–115. doi: 10.1016/bs.enz.2017.03.003

Fig. 7.

Fig. 7

The proposed Mg2+ in the catalytic mechanism of TrmD, involving an eight-membered ring that consists of the N1, C6, and O6 of the guanine ring, the hydrogen bond to the imino group of N1, the two coordination bonds of Mg2+, and the three atoms of the carboxylate of the general base D169. Atomic numbering is indicated for guanine.