Abstract
Human cystatin C (HCC) binds and inhibits all types of cysteine proteases from the papain family, including cathepsins (a group of enzymes that participate in a variety of physiological processes), which are some of its natural targets. The affinities of diverse proteases for HCC, expressed as equilibrium binding constants (Kb), range from 106 to 1014 M−1. Isothermal titration calorimetry (ITC) is one of the most useful techniques to characterize the thermodynamics of molecular associations, making it possible to dissect the binding free energy into its enthalpic and entropic components. This information, together with the structural changes that occur during the different associations, could enable better understanding of the molecular basis of affinity. Notwithstanding the high sensitivity of modern calorimeters, ITC requires protein concentrations in at least the 10–100 μM range to obtain reliable data, and it is known that HCC forms oligomers in this concentration range. We present herein a comparative study of the structural, thermal stability, and oligomerization properties of HCC and its stabilized variant (sHCC) L47C/G69C (which possesses an additional disulfide bridge) as well as their binding thermodynamics to the protease chymopapain, analyzed by ITC. The results show that, because sHCC remains monomeric, it is a better reporter than wild-type HCC to characterize the thermodynamics of binding to cysteine proteases.
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24 June 2019
The original publication of this article contained a number of grammatical errors. Unfortunately, an incorrect version of the file that did not include some final language editing was inadvertently published online. The original article has been corrected.
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Acknowledgments
This work was supported by the National Council of Science and Technology (CONACyT, México) by grants no. 181049 and 237256, by scholarship no. 283296 to D.O. Tovar-Anaya, and by a postdoctoral scholarship to M.T. Vieyra-Eusebio. The authors thank the Laboratorio de Supercómputo y Visualización en Paralelo and the Laboratorio Divisional de Espectrometría de Masas at the Universidad Autónoma Metropolitana-Iztapalapa for the use of their facilities. We are grateful to Miguel Costas from the Facultad de Química, UNAM for providing the VP‐DSC capillary facility to perform the differential scanning calorimetry experiments. We also thank Georgina Garza-Ramos from the Facultad de Medicina, UNAM for her expert help and facilitating our use of the FPLC for SEC experiments.
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The original version of this article was revised: The grammatical errors in the article have been corrected.
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Tovar-Anaya, D.O., Vera-Robles, L.I., Vieyra-Eusebio, M.T. et al. Stabilized Human Cystatin C Variant L47C/G69C Is a Better Reporter Than the Wild-Type Inhibitor for Characterizing the Thermodynamics of Binding to Cysteine Proteases. Protein J 38, 598–607 (2019). https://doi.org/10.1007/s10930-019-09839-2
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DOI: https://doi.org/10.1007/s10930-019-09839-2