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. Author manuscript; available in PMC: 2016 Feb 9.
Published in final edited form as: Mol Microbiol. 2009 Feb 11;72(1):85–97. doi: 10.1111/j.1365-2958.2009.06625.x

Fig. 1. The electron transport chain in mycobacteria and synthesis of menaquinone.

Fig. 1

Panel A: Architecture of selected aerobic respiratory pathways in mycobacteria. Panel B: Biosynthetic pathway for menaquinone in E. coli. Enzyme names are indicated in bold. C: Structure of the major menaquinone species found in mycobacteria, MK-9 (II-H2) (Minnikin, 1982); calculated monoisotopic mass = 786.63148. Menaquinones are identified by the length and chemical structure of prenyl chain, the predominant form of menaquinone in mycobacteria has 9 isoprene units with the second one being saturated (indicated by the arrow). Hence this menaquinone is identified as MK-9 (II-H2). The fully unsaturated version is known as MK-9 and has a calculated monoisotopic mass of 784.61583