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Posttranslational modification of dinitrogenase reductase in Rhodospirillum rubrum treated with fluoroacetate

  • Natalia Akentieva
Original Paper
  • 47 Downloads

Abstract

Nitrogen fixation is one of the major biogeochemical contributions carried out by diazotrophic microorganisms. The goal of this research is study of posttranslational modification of dinitrogenase reductase (Fe protein), the involvement of malate and pyruvate in generation of reductant in Rhodospirillum rubrum. A procedure for the isolation of the Fe protein from cell extracts was developed and used to monitor the modification of the Fe protein in vivo. The subunit pattern of the isolated the Fe protein after sodium dodecyl sulfate–polyacrylamide gel electrophoresis was assayed by Western blot analysis. Whole-cell nitrogenase activity was also monitored during the Fe protein modification by gas chromatograpy, using the acetylene reduction assay. It has been shown, that the addition of fluoroacetate, ammonia and darkness resulted in the loss of whole-cell nitrogenase activity and the in vivo modification of the Fe protein. For fluoroacetate, ammonia and darkness, the rate of loss of nitrogenase activity was similar to that for the Fe protein modification. The addition of NADH and reillumination of a culture incubated in the dark resulted in the rapid restoration of nitrogenase activity and the demodification of the Fe protein. Fluoroacetate inhibited the nitrogenase activity of R. rubrum and resulted in the modification of the Fe protein in cells, grown on pyruvate or malate as the endogeneous electron source. The nitrogenase activity in draTG mutant (lacking DRAT/DRAG system) decreased after the addition of fluoroacetate, but the Fe protein remained completely unmodified. The results showed that the reduced state of cell, posttranslational modifications of the Fe protein and the DRAT/DRAG system are important for nitrogenase activity and the regulation of nitrogen fixation.

Keywords

Dinitrogenase reductase (Fe protein) Nitrogen fixation Posttranslational modification Rhodospirillum rubrum 

Notes

Acknowledgements

Authors would like to thank the financial support of FASE, State Registration of Research Study Work is # 01201361874.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict interests.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Kinetics of Chemical and Biological Processes, Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovkaRussia

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