Periplasmic pyrroloquinoline quinone

The main activity of AAB is the oxidation of ethanol, initially formed by the yeasts, into acetic acid by periplasmic pyrroloquinoline-quinone-dependent dehydrogenase activities coupled to the membrane-anchored respiratory chain that provide these bacteria with the necessary energy. 

Bacteria that oxidize methane or methanol (methylotrophs) employ a periplasmic methanol dehydrogenase that contains as a bound coenzyme, the pyrroloquinoline quinone designated PQQ or meth-oxatin (Eq. 15-51).442 I 1 1 This fluorescent ortfzo-quinone... 

---