Lactococcus lactis: Difference between revisions
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==Description and significance== | ==Description and significance== | ||
''Lactococcus Lactis" is a non pathogenic,[[Gram-positive]] bacteria known as one of the most important microbes in dairy food production. Lactococci are immotile, nonsporelating, and are usually spherical or ovoid cells. Lactococci group in pairs or short chains with a length of about 1.2µm by 1.5µm. L. Lactis is the starter culture for the production of fermented dairy products such as milk, cheese, yogurt, etc. Lactococcus is a considered a opurtunistic pathogen because of its ability to produce lactic acid. Lactic acid produced by the the microbe curdles the milk which seperates into curds inturn are used to produce cheese and whey. | |||
==Genome structure== | ==Genome structure== | ||
==Cell structure and metabolism== | ==Cell structure and metabolism== | ||
Revision as of 15:36, 20 April 2009
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Description and significance
Lactococcus Lactis" is a non pathogenic,Gram-positive bacteria known as one of the most important microbes in dairy food production. Lactococci are immotile, nonsporelating, and are usually spherical or ovoid cells. Lactococci group in pairs or short chains with a length of about 1.2µm by 1.5µm. L. Lactis is the starter culture for the production of fermented dairy products such as milk, cheese, yogurt, etc. Lactococcus is a considered a opurtunistic pathogen because of its ability to produce lactic acid. Lactic acid produced by the the microbe curdles the milk which seperates into curds inturn are used to produce cheese and whey.
Genome structure
Cell structure and metabolism
"Lactococcus lactis" functions through both aerobic and anaerobic metabolic pathways. The primitive source of energy is produced anaerobicly, which results in the accumulation of lactic acid. the deprivation of oxygen leads the glycolysis process to breakdown carbohydratesinto pryvate which then convert into lactic acid. this process is only possible through the production of the lactate dehydrogenase enzyme and NAD. Lactate is transported to the median which causes the efflux of protons resulting in the appropriate membrane potential for energy production. The lactic acid produced is used for food production.Aerobic respiration is also used as a supplemental metabolic process. When oxygen and a heme source is present new traits are observed such as increased growth index, resistance to oxidative and acid stress, and long-termed endurance at low temperatures. Along with heme source, the presence of membrane bound NADH dehydrogenase oxidizes NADH and increases the cell growth and production of proteins and vitamins.