ATCC 23055 produces a large amount of 1,3-diaminopropane under normal growth conditions. The enzyme responsible, L-2,4-diaminobutyrate (DABA) decarboxylase (EC 4.1.1.-), was purified to electrophoretic homogeneity from this bacterium. The native enzyme had an of approximately 108000, with a pl of 5.0, and was a dimer composed of identical or nearly identical subunits with apparent 53000. The enzyme showed hyperbolic kinetics with a of 1.59 mM for DABA and 14.6 μM for pyridoxal 5'-phosphate as a coenzyme. The pH optimum was in the range 8.5–8.75, and Cagave a much higher enzyme activity than Mgas a cationic cofactor. -γ-AcetyIDABA, 2,3-diaminopropionic acid, ornithine and lysine were inert as substrates. The enzyme was different in subunit structure, N-terminal amino acid sequence and immunoreactivity from the DABA decarboxylase of previously described.


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