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本文证明整体英膜红假单孢光合菌Rhodospseudomonas Capsulata的氢酶有再循环利用分子氢,支持固氮活性的功能。从这个菌分离的铁氧还蛋白若以分子氢为电子供体,可被细菌自身的氢酶催化还原。分子氢-氢酶系统产生的还原力经Fd可偶联于固氮酶的乙炔还原反应。从荚膜红假单孢菌的粗提液分离到一个天然分部,具有电子载件的功能,参与分子氢-氢酶系统和固氮酶乙炔还原活性之间的电子传递。在这一天然分部内分离提取了一个低电位的细胞色素C_3,并检测出了NADPH专一、偶联甲基紫精的黄递酶活性。本文对Fd-细胞色素C_3复合体作为荚膜红假单孢菌的电子载体系统参与氢代谢和光合固氮间的联系的可能机理进行了讨论。 相似文献
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In vivo the hydrogenase of Rhodopseudomonas capsulata is capable of recycling molecular hydrogen, which is coupled to the nitrogenase for acetylene redaction. A ferredoxin from R. capsulata can be reduced by native hydrogenase with molecular hydrogen as electron donor. The reducing power generated by H_2-hydrogenase could couple to nitrogenase-dependent acetylene reduction via ferredoxin. A natural fraction from crude extracts of R. capsulata has been separated, which functions as an active electron carrier between H_2-hydrogenase system and acetylene reduction reaction by native nitrogenase. A low midpoint redox potential component was identified in this natural fraction. The evidence indicates that the component effective for the coupling of electron might be a cytochrome C_3. A methyl viologen-linked diaphorase activity specific to NADPH has been identified. The possible role of ferredoxincytochrome C_3 complex as an electron carrier system in the hydrogen evolution and hydrogen recycling process by 相似文献
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