Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Coexistence of Two Kinds of 6-Phospho-β-Galactosidase in the Cytosol of Lactobacillus gasseri JCM1031
Masakatsu SUZUKITadao SAITOTakatoshi ITOH
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1996 Volume 60 Issue 4 Pages 708-710

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Abstract

Lactobacillus (L.) gasseri JCM1031 has 2 kinds of 6-phospho-β-galactosidase (P-β-gal) in the cytosol. P-β-gal I was already isolated and characterized for our previous paper [Biosci. Biotech. Biochem., 60, 139-141 (1996)]. Another, P-β-gal II, was purified to homogeneity through several liquid chromatographic steps for this paper. The molecular mass of the purified enzyme was estimated to be 58 kDa by SDS-PAGE. The Km and Vmax for ONPGal-6P were 0.76 mM and 86.0 μmol/min/mg, respectively. Reducing reagents and Fe2+ ion activated the enzyme, but PCMB, Zn2+, and Hg2+ ions, and alkylation reagents strongly inihibited it. Twenty-five residues of the N-terminal amino acid sequence of the enzyme were identified. P-β-gal II was different from P-β-gal I in several characteristics.

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