4HH4:
reference: Structure and possible mechanism of the CcbJ methyltransferase from Streptomyces caelestis., Bauer J, Ondrovicova G, Najmanova L, Pevala V, Kamenik Z, Kostan J, Janata J, Kutejova E, Acta Crystallogr D Biol Crystallogr. 2014 Apr 1;70(Pt 4):943-57. doi:, 10.1107/S139900471303397X. Epub 2014 Mar 19. PMID: 24699640

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