Calcium ions potentiate lipoxygenase activity of cytochrome c at the physiological pH

被引:14
作者
Iwase, H [1 ]
Sakurada, K [1 ]
Takatori, T [1 ]
Nagao, M [1 ]
Niijima, H [1 ]
Matsuda, Y [1 ]
Kobayashi, M [1 ]
机构
[1] Univ Tokyo, Fac Med, Dept Forens Med, Bunkyo Ku, Tokyo 113, Japan
关键词
D O I
10.1006/bbrc.1998.8126
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Cytochrome c oxidized linoleic acid, with lipoxygenase-like activity, to 9-hydroperoxy-10, 12-octadecadienoic acid (9-HpODE), 13-hydroperoxy-9, 11-octadecadienoic acid (13-HpODE), 13-keto-9,11-octadecadienoic acid (13-KODE), and hydroxy-epoxy-octadecenoic acids (HEPOs) in the presence of calcium chloride at the physiological pH of 7.5. In the absence of calcium, the reaction was remarkably reduced. Statistically significant increase of 13-KODE was observed 1 min after the reaction was started by adding calcium, Calcium chloride at concentrations as low as 30 mu M caused statistically significant increase of 13-KODE production in the presence of 1 mu M cytochrome c, and cytochrome c at concentrations as low as 10 nM caused statistically significant increase of 13-KODE production in the presence of 2 mM calcium. The addition of bleomycin enhanced the reaction, and the addition of adriamycin attenuated the reaction. The same oxidized linoleic acid products were found in the submitochondrial particles which were hydrolyzed by phospholipase-A(2) in the presence of calcium. Lipoxygenase activity potentiated by calcium may be involved in the lipid peroxidation in the submitochondrial particles hydrolyzed by phospholipase-A(2). (C) 1998 Academic Press.
引用
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页码:485 / 491
页数:7
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