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A Comparative Study of the Formation of Acetate from Pyruvate in Group N Streptococci

Authors: M.P. Thomas, M.C. Broome, A.J. Hillier and G.R. Jago

Abstract:

The pathway forming acetate from pyruvate was saturated at lower levels of acetate in Streptococcus lactis subsp. Diacetylactis in Str. lactis C10 or Str. cremoris HP. The activity of the enzyme forming acetate was compared in Str. lactis C10 and Str. lactis subsp, diacetylactis DRC2, and it was shown that pyruvate decarboxylase, lipoate acetyl transferase and acetate kinase were more active in Str. lactis C10 than in Str. lactis subsp. diacetylactis DRC2. These differences are discussed in terms of the ability of Str. lactis subsp. diacetylactis to produce more acetoin and diacetyl than Str. lactis or Str. cremoris.

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