Molecular Cloning and Sequencing of Two Phospho-β-galactosidase I and II Genes of Lactobacillus gasseri JCM1031 Isolated from Human Intestine
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概要
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Lactobacillus (Lb.) gasseri JCM1031,which is classified into the B_1 subgroup of the Lb. acidophilus group of lactic acid bacteria, characteristically produces two different phospho-β-galactosidases (P-β-gal) I and II in the same cytosol as reported in our previous papers [Biosci. Biotech. Biochem., 60,139-141,708-710 (1996)]. To clarify the functional and genetic properties of the two enzymes, the structural genes of P-β-gal I and II were cloned and sequenced. The structural gene of P-β-gal I had 1,446 bp, encoding a polypeptide of 482 amino acid residues. The structural gene of P-β-gal II had 1,473 bp, encoding a polypeptide of 491 amino acid residues. The deduced relative molecular masses of 55,188 and 56,243 agreed well with the previous value obtained from the purified P-β-gal I and II protein, respectively. Multiple alignment of the protein sequence of P-β-gal I and II with those of P-β-gals from 5 microorganisms had 30-35% identity on the amino acid level, but those with phospho-β-glucosidases from 5 microorganisms had the relatively high identity of about 50%. Considering that this strain grows on lactose medium and shows no β-galactosidase activity, and that purified P-β-gal I and II can obviously hydrolyze o-nitrophenyl-β-D-galac-topyranoside 6-phosphate (substrate), and also the conservation of a cysteine residue in the molecule, the P-β-gal I and II were each confirmed as a novel P-β-gal enzyme.
- 社団法人日本農芸化学会の論文
- 1998-12-23
著者
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Kamio Yoshiyuki
Laboratory Of Applied Microbiology Department Of Molecular And Cell Biology Graduate School Of Agric
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Kawai Yasushi
東北大学 農学研究科
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Suzuki Megumi
Department Of Applied Biological Chemistry Faculty Of Agriculture Niigata University
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KITAZAWA Haruki
Laboratory of Animal Products Chemistry, Graduate School of Agricultural Science, Tohoku University
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SAITO Tadao
Laboratory of Animal Products Chemistry, Graduate School of Agricultural Science, Tohoku University
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Konno K
Kyoritsu Seiyaku Co.
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Itoh Tomoyuki
Department Of Biological Mechanisms And Functions Graduate School Of Bioagricultural Sciences Nagoya
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KAWAI Yasushi
Laboratory of Animal Products Chemistry, Graduate School of Agricultural Science, Tohoku University
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Suzuki M
Yamagata Univ. Yamagata Jpn
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ITOH Takatoshi
Laboratory of Animal Food Science, College of Bioresource Science, Nihon University
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Itoh T
Laboratory Of Animal Food Science College Of Bioresource Science Nihon University
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Suzuki Masakatsu
Laboratory Of Animal Products Chemistry
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Itoh T
Faculty Of Agriculture Iwate University
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Itoh T
Hiroshima Univ. Higashi-hiroshima Jpn
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Kamio Yoshiyuki
Laboratory Of Applied Microbiology Department Of Microbial Biotechnology Graduate School Of Agricult
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Kamio Yoshiyuki
Laboratory Of Applied Microbiology Graduate School Of Agricultural Science Tohoku University
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KONNO Kei
Laboratory of Animal Products Chemistry
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Kitazawa Haruki
Laboratory Of Animal Products Chemistry Graduate School Of Agricultural Science Tohoku University
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北澤 春樹
国立大学法人東北大学大学院農学研究科
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Saito Tadao
Laboratory Of Animal Products Chemistry Graduate School Of Agricultural Science Tohoku University
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