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Strains ofStreptococcus faecalis andS. faecium are known to produce ammonia from arginine, but onlyS. faecalis couples the adenosine triphosphate (ATP) produced through the arginine dihydrolase pathway to growth processes. The specific activities of the arginine dihydrolase enzymes were found to be much lower inS. faecium (0.01 to 0.10) than inS. faecalis (0.24 to 1.60). Phosphatase activities in both strains were similar (up to 0.11), but equaled or exceeded the activities of the arginine dihydrolase enzymes inS. faecium . The failure ofS. faecium to show increased growth in arginine media is explained on the basis of low activities of the arginine dihydrolase enzymes coupled with sufficient phosphatase activity to negate any benefit from ATP formed.

Activities of Arginine Dihydrolase and Phosphatase in Streptococcus faecalis and Streptococcus faecium