Arginine metabolism in Lactobacillus leichmannii.

Lactobacillus leichmannii ATCC 4797 metabolizes arginine via the arginine dihydrolase pathway producing ornithine, ammonia, carbon dioxide, and ATP. The specific activities of arginine deiminase and ornithine transcarbamylase were two-or threefold lower (stationary growth phase) in galactose-grown cells. The addition of arginine increased the specific activities of these two enzymes with all growth sugars. When glucose was virtually exhausted from the medium, maximum activities of both enzymes were achieved. The formation of two first enzymes of the arginine dihydrolase pathway in L. leichmannii ATCC 4797 seems to be under the control of two processes: induction by arginine and repression of the induced synthesis by glucose. [ABSTRACT FROM AUTHOR]

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