Comparison of α-acetolactate synthase and α-acetolactate decarboxylase in Lactococcus spp. and Leuconostoc spp. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biotechnology Letters Année : 1994

Comparison of α-acetolactate synthase and α-acetolactate decarboxylase in Lactococcus spp. and Leuconostoc spp.

Résumé

Cell-free extracts of Leuconostoc and Lactococcus species were tested for their alpha-acetolactate synthase and alpha-acetolactate decarboxylase activities. In Leuconostoc mesenteroides subsp. cremoris, Leuconostoc mesenteroides subsp. mesenteroides and Leuconostoc lactis, the Km of alpha-acetolactate synthase for pyruvate was close to 10 mM whereas it was 30 mM in Lactococcus lactis subsp. lactis biovar. diacetylactis. The Km of alpha-acetolactate decarboxylase for alpha-acetolactic acid was very low (0.3 mM) in Leuconostoc species in comparison to Lactococcus lactis subsp. lactis biovar. diacetylactis (60 mM). In the latter bacterium, alpha-acetolactate decarboxylase showed a sigmoidal dependance upon alpha-acetolactic acid and was activated by the three branched-chain amino acids: leucine, isoleucine and valine.
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Dates et versions

hal-01566301 , version 1 (20-07-2017)

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Christophe Monnet, V. Phalip, P. Schmitt, Charles Diviès. Comparison of α-acetolactate synthase and α-acetolactate decarboxylase in Lactococcus spp. and Leuconostoc spp.. Biotechnology Letters, 1994, 16 (3), pp.257-262. ⟨10.1007/BF00134622⟩. ⟨hal-01566301⟩

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