Aerobic ethanol production

Alcoholic fermentation, ethanol production, has been best known for a few decades by S. cerevisiae. Many obligate aerobic fungi, such as common moulds of the genera Aspergillus, Fusarium and Mucor are also well known for their ability to produce ethanol.2 The benefits are ... 

Various bacteria, and particularly the lactobadlfi, have been reported to use phosphoketolase (EC 4.1.2.9) during the metabofism of xylose [123-126]. Phosphoketolase has been reported in a few aerobic yeasts that use xylose rapidly [127-129], and the capacity of a Candida sp. to accumulate lipid has been attributed to its presence [130]. However, a role for this enzyme in ethanol production from xylose has not been estabfished. 

PsADH2 is not expressed under aerobic or fermentative conditions unless PsADHl is disrupted. The inabiHty of the Psadh double disruptant to grow on ethanol under full aerobiosis suggests that no other Adh activities are present under these conditions, but the continued ethanol production under oxygen-Hmited conditions implies that other isozymes exist. Indeed, evidence of a third Adh can be seen in some Southern blots of P. stipitis DNA. The gene for a third isoenzyme may be present but not expressed on ethanol under aerobic conditions. 

Varela H, Ferrari MD, Belobradjic L et al. (1997) Skin unhairing proteases of Bacillus subtilis production and partial characterization. Biotechnol Lett 19 755-758 Verduyn C, Zomerdijk TPL, van Etijken JHP et al. (1984) Continuous measurement of ethanol production by aerobic yeast suspensions with an enzyme electrode. J Appl Microbiol Biotechnol 19(3) 181-185... 

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