Purification and characterization of L-2,4-diaminobutyrate decarboxylase from Acinetobacter calcoaceticus

S. Yamamoto, Y. Tsuzaki, K. Tougou, S. Shinoda

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Abstract

Acinetobacter calcoaceticus 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 M(r) of approximately 108000, with a pI of 5.0, and was a dimer composed of identical or nearly identical subunits with apparent M(r) 53000. The enzyme showed hyperbolic kinetics with a K(m) of 1.59mM for DABA and 14.6μM for pyridoxal 5'-phosphate as a coenzyme. The pH optimum was in the range 8.5-8.75, and Ca2+ gave a much higher enzyme activity than Mg2+ as a cationic cofactor. N-γ-AcetylDABA, 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 Vibrio alginolyticus previously described.

Original languageEnglish
Pages (from-to)1461-1465
Number of pages5
JournalJournal of general microbiology
Volume138
Issue number7
DOIs
Publication statusPublished - Jan 1 1992

ASJC Scopus subject areas

  • Microbiology

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