Studies on bacterial amino-acid decarboxylases

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Abstract
Codecarboxylase widely distributed among animal tissues, plant tissues, yeasts, and bacteria could be extracted from dried brewer''s yeast by mildly alkaline solns. A method . of purification resulting in over-all purification of 15,000 times was described. The resulting prepn. was colorless or faintly yellow, contained C, H, N, but no P or S, and had a single absorption band in the u-v. at 265 m[mu]. The coen-zyme was stable to alkaline hydrolysis but was rapidly destroyed by N/10 H2SO4 at 100[degree]. Evidence was presented that l( + )-lysine decarboxylase and l([long dash])-tyrosine decar-boxylase had the same codecarboxylase.

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