Stereospecificity of sodium borohydride reduction of tyrosine decarboxylase from Streptococcus faecalis.

Tyramine-producing streptococci in neonatal diarrhoea.

An outbreak of neonatal diarrhoea associated with large numbers of Streptococcus faecalis var. zymogenes is described.A follow-up survey showed that 23.3% of 347 healthy babies carried this organism without ill effect. The tyrosine decarboxylase activity of the streptococci from both sick and healthy babies was identically high. It is suggested that the tyramine-producing activity of these stre...

Studies on bacterial amino-acid decarboxylases: 2. l(-)-tyrosine decarboxylase from Streptococcus faecalis.

Tyrosine Decarboxylase: II. Pyridoxine-deficient Medium for Apoenzyme Production.

Previous communications from this laboratory have established the function of pyridoxine derivatives' in the tyrosine decarboxylase system of Streptococcus faecalis, and a synthetic medium has been described for the production of cells active in this function (Bellamy and Gunsalus, 1943, 1944). Cells grown in media deficient in,pyridoxine derivatives have been shown to contain the tyrosine deca...

Amino acid decarboxylases of lactic acid bacteria.

Many strains of a wide variety of bacterial species have been studied for their amino acid decarboxylase activity (Gale, 1946). However, to our knowledge the lactobacilli have not been examined. It has been shown in our laboratory that oral lactobacilli may be classified into three types according to their ability to attack certain carbohydrates, intensity of acid production from glucose, and b...

Effect of chlortetracycline on vitamin B6 and amino acid decarboxylase in bacteria from the alimentary tract of the chick.

Melnykowycz and Johansson (1955) have shown that chlortetracycline suppresses amino acid decarboxylation by intestinal microorganisms in the rat, formation of lysine decarboxylase in Escherichia coli, and decarboxylation of tyrosine in Streptococcus faecalis R. These workers postulate that antibiotics reduce enterotoxemia and improve growth by inhibiting amine formation in the intestine. Since ...