超氧化物歧化酶和过氧化氢酶对蓝藻圆柱鱼腥藻固氮质子供体系统的保护作用
Superoxide dismutase and catalase in the protection of the proton-donating systems of nitrogen fixation in the blue-green alga Anabaena cylindrica.
作者信息
Henry L E, Gogotov I N, Hall D O
出版信息
Biochem J. 1978 Aug 15;174(2):373-7. doi: 10.1042/bj1740373.
Abstract
- Superoxide dismutase activity was present in the heterocysts and vegetative cells of Anabaena cylindrica, but was always lower in the heterocysts. 2. No qualitative differences were found in the superoxide dismutase from the two cellular types. 3. Catalase activity was also present in both cellular types. 4. Most of the NADP reductase activity, as assayed with menadione or ferredoxin as electron acceptor, was localized within the heterocysts. 5. Studies on H2 consumption showed that most of the hydrogenase activity was associated with the heterocysts. 6. The results are discussed in terms of the postulate that superoxide dismutase and catalase are involved in the protection of the proton-donating systems participating in N2 fixation and H2 metabolism of heterocysts.
摘要
- 超氧化物歧化酶活性存在于柱状鱼腥藻的异形胞和营养细胞中，但异形胞中的活性总是较低。2. 未发现两种细胞类型的超氧化物歧化酶存在质的差异。3. 过氧化氢酶活性在两种细胞类型中也都存在。4. 以甲萘醌或铁氧化还原蛋白作为电子受体测定时，大部分NADP还原酶活性定位于异形胞内。5. 关于氢气消耗的研究表明，大部分氢化酶活性与异形胞有关。6. 根据超氧化物歧化酶和过氧化氢酶参与保护参与异形胞固氮和氢气代谢的质子供体系统这一假设对结果进行了讨论。
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