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球形红假单胞菌提取物中δ-氨基乙酰丙酸合成酶的激活

Activation of delta-aminolaevulate synthetase in extracts of Rhodopseudomonas spheroides.

作者信息

Marriott J, Neuberger A, Tait G H

出版信息

Biochem J. 1970 Apr;117(3):609-13. doi: 10.1042/bj1170609.

Abstract
  1. The spontaneous activation of delta-aminolaevulate synthetase in extracts from Rhodopseudomonas spheroides grown semi-anaerobically in the light requires oxygen and does not take place anaerobically in the dark. 2. Activation is completely prevented by azide or cyanide and is partially inhibited by chlorpromazine. These compounds inhibit markedly the succinoxidase activity of extracts. 3. NADH delays activation, but when it has been oxidized by the extract activation begins at the normal rate and complete activation occurs. By contrast both the rate and the extent of activation are markedly decreased by even small amounts of carboxylic acids. 4. The inhibitory effects of succinate and citrate on activation can be prevented by malonate and fluorocitrate respectively. 5. These results suggest that for activation to occur some endogenous compound has to be oxidized via the electron transport chain. 6. Activation occurs under anaerobic conditions in the light, probably by photo-oxidation.
摘要
  1. 在光照下半厌氧培养的球形红假单胞菌提取物中,δ-氨基乙酰丙酸合成酶的自发激活需要氧气,在黑暗中厌氧条件下不会发生。2. 叠氮化物或氰化物可完全阻止激活,氯丙嗪可部分抑制激活。这些化合物显著抑制提取物的琥珀酸氧化酶活性。3. NADH会延迟激活,但当它被提取物氧化后,激活以正常速率开始并完全激活。相比之下,即使少量的羧酸也会显著降低激活的速率和程度。4. 琥珀酸和柠檬酸对激活的抑制作用可分别被丙二酸和氟柠檬酸阻止。5. 这些结果表明,为了发生激活,一些内源性化合物必须通过电子传递链被氧化。6. 在光照下的厌氧条件下会发生激活,可能是通过光氧化作用。

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