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The structure of PQQ and the pqq operons in K. pneumoniae and M. extorquens (Mex). Note that in Mex, pqqD is fused to the C-terminal of pqqC, while in K. pneumoniae PqqC and PqqD are encoded by separate genes. In K. pneumoniae the gene encoding the PqqF protease is located in the operon, unlike in Mex.
