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- W1549764582 abstract "The carboxylase activity of ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBPC/O) decreased when an anaerobic culture of Rhodospirillum rubrum was exposed to atmospheric levels of oxygen. From 70 to 80% of the activity was lost within 12 to 24 h. Inactivation was apparent when the enzyme was assayed in situ (in whole cells) and when activity was measured in dialyzed crude extracts. The quantity of enzyme protein, as estimated from sodium dodecyl sulfate-polyacrylamide gels or as quantified immunologically, did not decrease within 24 h of exposure to air. Following extended exposure to aerobic conditions (48 to 72 h), degradation of enzyme occurred. These results indicate that the inactivation of RuBPC/O in R. rubrum may be due to an alteration or modification of the preformed enzyme, followed by eventual degradation of the inactive enzyme. When shifted back to anaerobic conditions (under an argon atmosphere), the RuBPC/O activity increased rapidly. This increase appeared to be due to de novo synthesis of enzyme. The increase in activity was not observed when the culture was maintained in the dark or in the absence of a suitable carbon source. Thus, the oxygen-mediated inactivation of RuBPC/O appeared to be due to some form of irreversible modification. The cloned R. rubrum RuBPC/O gene, expressed in Escherichia coli, yielded functional enzyme that was not affected by oxygen, indicating that inactivation in R. rubrum is mediated by a gene product(s) not found in E. coli." @default.
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- W1549764582 date "1988-12-01" @default.
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- W1549764582 title "Oxygen regulation of ribulose 1,5-bisphosphate carboxylase activity in Rhodospirillum rubrum" @default.
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- W1549764582 doi "https://doi.org/10.1128/jb.170.12.5468-5472.1988" @default.
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