Abstract
Zymogen (prothrombin) activation is central to the process of haemostasis (blood clotting) in the body, preventing serious blood loss and death from haemorrhagic shock. Zeolites comprise a family of crystalline microporous aluminosilicates that show increasing promise for use in massive bleeding control. However, the mechanism of zeolite-initiated haemostasis has remained unclear. Here, we investigate zeolite-initiated thrombin activation at the molecular level, and show that a prothrombinase complex can assemble on the inorganic surface of calcium-ion-exchanged zeolites (Ca-zeolites). Compared to natural platelet-based physiological processes, prothrombin-to-thrombin conversion on the surface of Ca-zeolite displays a striking thrombin activation pattern, with an exceptionally high plateau thrombin activity and at least 12-fold enhanced endogenous thrombin. The results provide a mechanistic understanding of how the zeolite surface functionally contributes to thrombin activation, paving the way towards the design of improved agents for bleeding management.

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Measurements of heterogeneity in proteomics analysis of the nanoparticle protein corona across core facilities
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Data availability
All data supporting the findings of this study are available within the Article and its Supplementary Information or from the corresponding authors upon reasonable request. The MS proteomics data have been deposited in the ProteomeXchange Consortium (http://proteomecentral.proteomexchange.org) via the iProX partner repository with the dataset identifier PXD024170. Source data are provided with this paper.
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Acknowledgements
J.F. acknowledges support from the National Natural Science Foundation of China (91545113, 91845203 and 92045301), China Postdoctoral Science Foundation (2017M610363 and 2018T110584), Shell Global Solutions International BV (PT71423 and PT74557), Fok Ying Tong Education Foundation (131015) and the Science & Technology Program of Ningbo (2017C50014). K.A.D. acknowledges that this publication has emanated from research supported in part by grants from Science Foundation Ireland (17/NSFC/4898 and 17/ERCD/4962) and also from funding under Guangdong Provincial Education Department Key Laboratory of Nano-Immunoregulation Tumor Microenvironment (2019KSYS008). V.C. acknowledges support from the Irish Research Council (GOIPD/2016/128). L.B. acknowledges financial support from the EU H2020 Nanofacturing project (grant agreement no. 646364). V.P. acknowledges financial support from CALIN. We thank Q. Gao for helping with proteomic analysis and protein structure analysis.
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J.F. and K.A.D. conceived the project. J.F., K.A.D., X.S. and H.C. designed the experiments and wrote the manuscript. X.S. and H.C. carried out the experiments and data analysis. K.L., V.C., L.B. and V.P. helped with the protein corona MS analysis. M.H. and F.W. helped with the protein conformation analysis. L.X. and L.Y. helped with revision of the manuscript. All authors discussed the results and contributed to the manuscript.
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Peer review information Nature Catalysis thanks Russell Morris, Ivan D Tarandovskiy and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Shang, X., Chen, H., Castagnola, V. et al. Unusual zymogen activation patterns in the protein corona of Ca-zeolites. Nat Catal 4, 607–614 (2021). https://doi.org/10.1038/s41929-021-00654-6
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DOI: https://doi.org/10.1038/s41929-021-00654-6
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