1WKD:
reference: Mutagenesis and crystallographic studies of Zymomonas mobilis tRNA-guanine transglycosylase reveal aspartate 102 as the active site nucleophile., Romier C, Reuter K, Suck D, Ficner R, Biochemistry 1996 Dec 10;35(49):15734-9. PMID: 8961936

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