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Furthermore, deletion of the PQQ biosynthesis gene cluster (pqqABCDE) abolished ADH activity completely, but did not affect ALDH activity. Instead, the molybdopterin biosynthesis gene deletion derivatives lost ALDH activity. Thus, we concluded that the AldFGH and AldSLC complexes of Ga. diazotrophicus PAL5 require a form of molybdopterin but not PQQ for ALDH activity. KEY POINTS • AldFGH is the major aldehyde dehydrogenase in Gluconacetobacter diazotrophicus PAL5. • Acetaldehyde accumulated from ethanol in the absence of AldFGH. • Molyb