Info

\

/ ljr.

malate2

malate2-

lactate-

malate2-

lactate-

malate2-

malate2-

Figure 10-5. Malate transport in wine lactic acid bacteria. Transport of malate by Oenococcus oeni is mediated via a uniport malate permease (A). The accumulated malate is then decarboxylated directly to lactate by malolactate enzyme (ME); lactate efflux occurs via passive diffusion. The malolactic reaction also consumes a proton, such that the cytoplasm becomes more alkaline and more negatively charged. Thus, the electo-chemical gradient across the membrane (the proton motive force) is increased, and ATP is conserved. In lac-tobacilli and lactococci, a similar process occurs (B), except that malate permease acts as an antiporter, such that lactate efflux drives malate uptake. Adapted from Konings, W.N. 2002.

Was this article helpful?

0 0
Brew Your Own Beer

Brew Your Own Beer

Discover How To Become Your Own Brew Master, With Brew Your Own Beer. It takes more than a recipe to make a great beer. Just using the right ingredients doesn't mean your beer will taste like it was meant to. Most of the time it’s the way a beer is made and served that makes it either an exceptional beer or one that gets dumped into the nearest flower pot.

Get My Free Ebook


Post a comment