Yeast Glycogen Phosphorylase: Kinetic Properties Compared with Muscle and Potato Enzymes(Biological Chemistry)
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概要
- 論文の詳細を見る
The apparent Km values of yeast α-glucan phosphorylase [EC 2.4.1.1] for glucose 1-phosphate, glycogen and maltopentaose were 1.3mM, 0.10mM and 8.8mM, respectively. The Km values for maltopentaose clearly distinguished the muscle and yeast enzymes from the potato enzyme. Comparison of the Km values for maltooligosaccharides in the directions of both glycogen synthesis and degradation showed the similarity of the muscle and yeast enzymes. Affinity-gel electrophoresis indicated that the dissociation constant of the yeast enzyme for maltoheptaose was 0.23mM, which was 26-fold smaller than the Km value for maltoheptaose (5.9 mM). Inhibition of the yeast enzyme activity by glucose 6-phosphate and UDP-glucose was much stronger than that by fructose 6-phosphate and fructose 1,6-bisphosphate. Moreover, tryptic inactivation of the yeast enzyme was greatly increased by UDP-glucose and glucose 6-phosphate. Based on the kinetic properties, a regulatory mechanism of the yeast phosphorylase was discussed in comparison with those for the muscle and potato phosphorylases.
- 社団法人日本農芸化学会の論文
- 1988-03-23
著者
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Takagi Shiro
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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Tanabe Satoshi
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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Matsuda Kazuo
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University:(present Office)iwaki-
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Matsuda Kazuo
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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KOBAYASHI Mikihiko
Department of Agricultural Chemistry, Faculty of Agriculture, Tohoku University
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Kobayashi M
Biophotonics Information Laboratories Yamagata Advanced Technology Research And Development Center
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Kobayashi Mikihiko
Jissen Women's Univ.
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Kobayashi Mikihiko
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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Matsuda K
Iwaki Meisei Univ. Fukushima Jpn
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KOBAYASHI Masaki
Yamagata Advanced Technology Research and Development Center
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Matsuda Kazuo
Department Of Agricultural Biochemistry Faculty Of Agriculture Tohoku University
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