Abstract
The impact of nanomaterial transformations on photosynthetic proteins remains largely unknown. We report positively charged iron oxide (Fe3O4) nanoparticles experience transformations in Arabidopsis thaliana plants in vivo that alter the formation and function of RuBisCO protein corona, a key carbon fixation enzyme. In vitro, negatively charged Fe3O4 nanoparticles impact the RuBisCO function but not their positively charged counterparts. Computational and in vitro proteomic analyses revealed that positively charged Fe3O4 nanoparticles preferentially bind to a RuBisCO small subunit that lacks active carboxylation sites. However, both positively and negatively charged nanoparticles decrease RuBisCO carboxylation activity after experiencing transformations in vivo by 3.0 and 1.7 times relative to the controls, respectively. The pH- and lipid-coating-dependent transformations that occur during nanoparticle transport across plant membranes enhance RuBisCO binding to positively charged nanoparticles affecting its distribution in chloroplasts. Elucidating the rules of how nanoparticle properties and transformations affect photosynthetic coronas is crucial for sustainable nano-enabled agriculture.
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Data availability
Proteomics data for the proteomic analysis of NPs interfaced in vivo and in vitro are available at https://repository.jpostdb.org/entry/JPST003297.0 and for the partial digestion of RuBisCO with NPs are available at https://repository.jpostdb.org/entry/JPST003300. Any other data supporting the findings of this study are available in the Article and its Supplementary Information or from the corresponding author upon request. Source data are provided with this paper.
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Acknowledgements
This work was supported by the National Science Foundation under grant no. CHE-2001611, the NSF Center for Sustainable Nanotechnology. We acknowledge support from the UC President’s Pre-Professoriate Fellowship to C.C. We thank J. Arrington from the University of Illinois Urbana-Champaign for processing the raw proteomic data, and M. M. Dickinson from the Central Facility for Advanced Microscopy and Microanalysis at the University of California, Riverside, for the TEM analysis sample preparation. We also thank the UC Riverside Metabolomics Core for performing the metabolomics analysis. The computing resources necessary for this work were performed in part on Bridges at the Pittsburgh Supercomputing Center through allocation CTS090079 provided by the Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS), which is supported by the National Science Foundation (NSF) grant nos. 2138259, 2138286, 2138307, 2137603 and 2138296. Additional computing resources were provided by the Advanced Research Computing at Hopkins (ARCH) high-performance computing (HPC) facilities.
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J.P.G. and C.C. conceived the idea, designed the experiments and performed the data analysis. S.-J.J. conducted the fluorescence imaging analysis to visualize the in vivo corona formation on NPs and performed the biocompatibility measurements. C.J.M. and K.N.L.H. contributed to the proteomic analysis and performed the in vitro RuBisCO activity measurements. C.A. performed the pH-dependent in vitro RuBisCO protein corona formation experiments. K.E.W. and C.A. performed and analysed the samples for circular dichroism. K.E.W. and E.S. contributed with the proteomic analysis support. J.C.W., C.D. and Yi Wang collected and analysed the TEM images. R.H., X.W. and Yinhan Wang performed the coarse-grained simulations and analysis. All authors contributed to the manuscript writing.
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Castillo, C., Jeon, SJ., Hoang, K.N.L. et al. In vivo transformations of positively charged nanoparticles alter the formation and function of RuBisCO photosynthetic protein corona. Nat. Nanotechnol. (2025). https://doi.org/10.1038/s41565-025-01944-x
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DOI: https://doi.org/10.1038/s41565-025-01944-x