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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: Methods Enzymol. 2018;606:389–420. doi: 10.1016/bs.mie.2018.04.002

Fig. 2.

Fig. 2

Simplified scheme of the PQQ biosynthetic pathway. PqqE catalyzes the first step in PQQ biosynthesis. The specific involvement of PqqF and PqqB within the pathway is under investigation. The roles of PqqA, PqqC, PqqE, and PqqD are now well established (see text).