Abstract
A protease inhibitor protein with the molecular mass of 11,804.931 Da (analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry) was isolated from Aloe vera leaf gel and designated as AVPI-12. The isoelectric point of the protein is about 7.43. The first ten amino acid sequence from the N-terminal was found to be R–D–W–A–E–P–N–D–G–Y, which did not match other protease inhibitors in database searches and other publications, indicating AVPI-12 is a novel protease inhibitor. The band protein of AVPI-12 migrated further on nonreducing sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) than reducing SDS-PAGE. This result indicated that the molecule of AVPI-12 did not contain interchain disulfide bonds, but appeared to have intrachain disulfide bonds instead. AVPI-12 strongly resisted digestion by the serine proteases human plasmin and bovine trypsin. The protein could protect the γ-subunit of human fibrinogen from plasmin and trypsin digestion, similar to the natural plasma serine protease inhibitor α2-macroglobulin. The protein also could protect the γ-subunit of fibrinogen from the cysteine protease papain. AVPI-12 also exhibited dose-dependent inhibition of the fibrinogenolytic activity of plasmin, similar to α2-macroglobulin. The fibrinolytic inhibitory activity of AVPI-12 and the small-angle X-ray scattering showed that the protein could protect human fibrin clot from complete degradation by plasmin. The inhibition of the fibrinogenolytic and fibrinolytic activities of plasmin by AVPI-12 suggests that the inhibitor has potential for use in antifibrinolytic treatment.
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Acknowledgments
This research was supported by the Suranaree University of Technology Research Grant (SUT1-102-55-12-34). We also thank the Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand for providing facilities to do the SAXS experiment at BL-2.2 and analyses.
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Siritapetawee, J., Sojikul, P., Soontaranon, S. et al. A Protein from Aloe vera that Inhibits the Cleavage of Human Fibrin(ogen) by Plasmin. Appl Biochem Biotechnol 170, 2034–2045 (2013). https://doi.org/10.1007/s12010-013-0356-2
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DOI: https://doi.org/10.1007/s12010-013-0356-2