Abstract
Rubisco, the enzyme that catalyzes the fixation of atmospheric CO2 in photosynthesis, is subject to inactivation by inhibitory sugar phosphates. Here we report the 2.95-Å crystal structure of Nicotiana tabacum Rubisco activase (Rca), the enzyme that facilitates the removal of these inhibitors. Rca from tobacco has a classical AAA+-protein domain architecture. Although Rca populates a range of oligomeric states when in solution, it forms a helical arrangement with six subunits per turn when in the crystal. However, negative-stain electron microscopy of the active mutant R294V suggests that Rca functions as a hexamer. The residues determining species specificity for Rubisco are located in a helical insertion of the C-terminal domain and probably function in conjunction with the N-domain in Rubisco recognition. Loop segments exposed toward the central pore of the hexamer are required for the ATP-dependent remodeling of Rubisco, resulting in the release of inhibitory sugar.
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Acknowledgements
We thank T. Wauer and L. Popilka for assistance in protein purification and enzyme assays, the Max Planck Institute of Biochemistry Crystallization Facility for support during screening, as well as the Joint Structural Biology Group staff at the European Synchrotron Radiation Facility. Tobacco leaves for the purification of Rubisco were a gift of H.-U. Koob and S. Kirchner (Ludwig-Maximilians-Universität München). The pHUENtRca plasmid was a gift from S. Whitney (Australian National University). We thank the Deutsche Forschungsgemeinschaft (DFG) (SFB 594; DFG grant WE4628/1 to P.W.) and the Körber Foundation for financial support.
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M.S. obtained the Rca crystals and solved the structure together with A.B. M.S. carried out all the biochemical experiments, with help from O.M.-C. The EM and 3D-image analysis were done by S.C. and P.W. All authors contributed to data interpretation and manuscript preparation. M.S., A.B., F.U.H. and M.H.-H. wrote the paper.
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Stotz, M., Mueller-Cajar, O., Ciniawsky, S. et al. Structure of green-type Rubisco activase from tobacco. Nat Struct Mol Biol 18, 1366–1370 (2011). https://doi.org/10.1038/nsmb.2171
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DOI: https://doi.org/10.1038/nsmb.2171
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