Plant Physiol. Drug Metab Dispos
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Plant Physiology 74:261-267 (1984)
© 1984 American Society of Plant Biologists

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Articles

Purification of Glyoxysomal Catalase and Immunochemical Comparison of Glyoxysomal and Leaf Peroxisomal Catalase in Germinating Pumpkin Cotyledons 1

Junji Yamaguchi and Mikio Nishimura

Research Institute for Biochemical Regulation, School of Agriculture, Nagoya University, Chikusa, Nagoya 464, Japan

As a step to study the mechanism of the microbody transition (glyoxysomes to leaf peroxisomes) in pumpkin (Cucurbita sp. Amakuri Nankin) cotyledons, catalase was purified from glyoxysomes. The molecular weight of the purified catalase was determined to be 230,000 to 250,000 daltons. The enzyme was judged to consist of four identical pieces of the monomeric subunit with molecular weight of 55,000 daltons. Absorption spectrum of the catalase molecule gave two major peaks at 280 and 405 nanometers, showing that the pumpkin enzyme contains heme. The ratio of absorption at 405 and 280 nanometers was 1.0, the value being lower than that obtained for catalase from other plant sources. These results indicate that the pumpkin glyoxysomal catalase contains the higher content of heme in comparison with other plant catalase.

The immunochemical resemblance between glyoxysomal and leaf peroxisomal catalase was examined by using the antiserum specific against the purified enzyme preparation from pumpkin glyoxysomes. Ouchterlony double diffusion and immunoelectrophoretic analysis demonstrated that catalase from both types of microbodies cross-reacted completely whereas the immunotitration analysis showed that the specific activity of the glyoxysomal catalase was 2.5-fold higher than that of leaf peroxisomal catalase. Single radial immunodiffusion analysis showed that the specific activity of catalase decreased during the greening of pumpkin cotyledons.

1 The research was supported in part by research grants from the Ministry of Education, Science and Culture of Japan (5776065) and the Ishida Foundation (Nagoya). This is Paper 3 in the series "Analytical Studies on Microbody Transition." Paper 2 of the series is Ref. 23.




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