Abstract
Streptococcus faecalis ATCC 11700 uses agmatine as its sole energy source for growth. Agmatine deiminase and putrescine carbamoyltransferase are coinduced by growth on agmatine. Glucose and arginine were found to exert catabolite repression on the agmatine deiminase pathway. Four mutants unable to utilize agmatine as an energy source, isolated from the wild-type strain, exhibited three distinct phenotypes. Two of these strains showed essentially no agmatine deiminase, one mutant showed negligible activity of putrescine carbamoyltransferase, and one mutant was defective in both activities. Two carbamate kinases are present in S. faecalis, one belonging to the arginine deiminase pathway, the other being induced by growth on agmatine. These two enzymes have the same molecular weight, 82,000, and seem quite different in size from the kinases isolated from other streptococci.
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