Occurrence and Some Properties of Two Types of δ-Aminolevulinic Acid Synthase in a Facultative Methylotroph, Protaminobacter ruber

Kazuyoshi SatoDepartment of Food Science and Technology, Faculty of Agriculture, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464, Japan

Koichi KoichiIshidaDepartment of Food Science and Technology, Faculty of Agriculture, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464, Japan

Makoto ShiraiDepartment of Food Science and Technology, Faculty of Agriculture, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464, Japan

Shoichi ShimizuDepartment of Food Science and Technology, Faculty of Agriculture, Nagoya University, Furo-cho, Chikusa-ku, Nagoya464, Japan

Abstract

In addition to the α-ALA synthase already reported (Fraction I: molecular weight, 100,000; optimal pH, ca. 8.0), an isozyme (Fraction II: molecular weight, 64,000; optimal pH, ca. 6.4) was found in Protaminobacter ruber grown in the dark after an initial light period (20~30hr). The fraction I- and II-enzymes were separable by gel-filtration through Sepharose 6B. While the former was formed constitutively, the latter was formed inducibly under the conditions for bacteriochlo-rophyll formation. Therefore, the fraction II-isozyme seems to be responsible for the biosynthesis of bacteriochlorophyll.

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Occurrence and Some Properties of Two Types of δ-Aminolevulinic Acid Synthase in a Facultative Methylotroph, Protaminobacter ruber

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Occurrence and Some Properties of Two Types of δ-Aminolevulinic Acid Synthase in a Facultative Methylotroph, Protaminobacter ruber

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