Abstract
Oxidation of the cysteines from ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO) leads to inactivation and promotes structural changes that increase the proteolytic sensitivity and membrane association propensity related to its catabolism. To uncover the individual role of the different cysteines, the sequential order of modification under increasing oxidative conditions was determined using chemical labeling and mass spectrometry. Besides, site-directed RubisCO mutants were obtained in Chlamydomonas reinhardtii replacing single conserved cysteines (Cys84, Cys172, Cys192, Cys247, Cys284, Cys427, Cys459 from the large and sCys41, sCys83 from the small subunit) and the redox properties of the mutant enzymes were determined. All mutants retained significant carboxylase activity and grew photoautotrophically, indicating that these conserved cysteines are not essential for catalysis. Cys84 played a noticeable structural role, its replacement producing a structurally altered enzyme. While Cys247, Cys284, and sCys83 were not affected by the redox environment, all other residues were oxidized using a disulfide/thiol ratio of around two, except for Cys172 whose oxidation was distinctly delayed. Remarkably, Cys192 and Cys427 were apparently protective, their absence leading to a premature oxidation of critical residues (Cys172 and Cys459). These cysteines integrate a regulatory network that modulates RubisCO activity and conformation in response to oxidative conditions.
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Abbreviations
- AC:
-
Acrylamide
- CSH:
-
2-Mercaptoethylamine (cysteamine)
- CSSC:
-
2-Mercaptoethylamine disulfide (cystamine)
- DTT:
-
Dithiothreitol
- GuCl:
-
Guanidinium chloride
- IAM:
-
Iodoacetamide
- RubisCO:
-
Ribulose 1,5-bisphosphate carboxylase/oxygenase
- SEM:
-
Standard error of the mean
- VP:
-
4-Vinylpyridine
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Acknowledgements
We thank Dr. Robert J. Spreitzer (University of Nebraska at Lincoln, USA) for advice and material support to obtain the RubisCO cysteine-to-serine mutants, and Luz Valero (SCSIE, University of Valencia) for processing the samples for mass spectrometry. This work was supported by grants of the Spanish Ministry of Science and Research (BFU2009-11965 from MCeI-DGI) and the University of Valencia (UV-INV-AE14-269247). H.P.K.S. received a fellowship for doctoral studies from the Spanish Ministry of Foreign Affairs and Cooperation (MAEC-AECID).
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García-Murria, M.J., Sudhani, H.P.K., Marín-Navarro, J. et al. Dissecting the individual contribution of conserved cysteines to the redox regulation of RubisCO. Photosynth Res 137, 251–262 (2018). https://doi.org/10.1007/s11120-018-0497-9
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DOI: https://doi.org/10.1007/s11120-018-0497-9