Occurrence of a novel L-2,4-diaminobutyrate decarboxylase activity in some species of Enterobacteriaceae, and purification and characterization of the enzymes of Enterobacter aerogenes and Serratia marcescens.

Abstract:

:L-2,4-Diaminobutyrate decarboxylase (DABA DC) is a novel enzyme yielding 1,3-diaminopropane (DAP) from DABA, which has previously been purified from strains of the genera Vibrio and Acinetobacter. In this study, we also detected DABA DC activity in the species of Enterobacteriaceae: E. aerogenes, E. cloacae, E. agglomerans, Serratia marcescens, S. liquefaciens, Klebsiella pneumoniace, K. oxytoca and Citrobacter freundii, all of which produced DAP in sufficient amounts. Subsequently, the DABA DCs of E. aerogenes and S. marcescens were purified to homogeneity and characterized. Two separate enzymes had similar properties with respect to chromatographic behaviors, and were a dimer with subunits of identical molecular mass of about 51 kDa. The maximal activity of each enzyme was obtained at pH 8.0-8.25. Both enzymes required pyridoxal 5'-phosphate and Mg2+ for full activity, and were highly specific for L-DABA. There was immunological similarity, but not identity between these proteins, as determined by Ouchterlony double diffusion analysis with antiserum against the E. aerogenes DABA DC. They showed the same N-terminal amino acid sequence up to the 8th residue (S-K-L-N-P-I-L-A-). These enzymes were different in molecular mass, N-terminal amino acid sequence and antigenicity from DABA DCs of Acientobacter and Vibrio species.

journal_name

Biol Pharm Bull

authors

Yamamoto S,Mutoh N,Ikai H,Nagasaka M

doi

10.1248/bpb.19.1298

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

1298-303

issue

10

eissn

0918-6158

issn

1347-5215

journal_volume

19

pub_type

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