Ｅｎｔｅｒｏｃｏｃｃｕｓ　ｆａｅｃａｌｉｓのｐｈｏｓｐｈｏｅｎｏｌｐｙｒｕｖａｔｅ：　ｃａｒｂｏｈｙｄｒａｔｅ　ｐｈｏｓｐｈｏｔｒａｎｓｆｅｒａｓｅ　ｓｙｓｔｅｍ（ＰＴＳ）

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タイトル別名
  • Phosphoenolpyruvate:carbohydrate phosphotransferase systems in Enterococcus faecalis.
  • Enterococcus faecalis ノ phospho enolpyr

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A wild-type strain of Enterococcus feacalis and its mutants resistant to 2-deoxy-D-glucose (2DG) were examined for the presence of phosphoenolpyruvate: carbohydrate phosphotransferase systems (PTSs) with 12 carbohydrates, which were utilized by the organism, as the sibstrates.<br>The wild-type strain possessed a constitutive mannose-PTS, which was reactive with glucose, mannose, glucosamine, 2DG and fructose. This activity was absent in the mutants. No independent glucose- or fructose-PTS was found in the mannose-PTS-defective mutants. The mutants, however, showed a low level of a constitutive PTS activity with maltose, suggesting the existence of an independent maltose-PTS in the organism. Both wild-type and mutant strains possessed inducible lactose-, mannitol-, and trehalose-PTSs. Lactose-PTS was induced by either lactose or galactose in the parent, but only by lactose in the mutants. The lactose-PTS was not reactive with galactose, and no separate galactose-PTS was present. These observations suggest that the inducer for lactose-PTS, probably being galactose 6-phosphate, may not be formed from galactose in the organism when the constitutive mannose-PTS is lost by mutation.

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