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. Author manuscript; available in PMC: 2013 Apr 1.
Published in final edited form as: Curr Opin Chem Biol. 2012 Mar 2;16(1-2):54–59. doi: 10.1016/j.cbpa.2012.02.010

Figure 1.

Figure 1

Proposed pathways of cofactor biogenesis for Ni-urease, Co-nitrile hydratase, pyrroloquinoline quinone (PQQ), hypusine, and tryptophan tryptophylquinone (TTQ). Post-translational modifications made at each step are shown in red.