Abstract
Using micro-differential scanning calorimetry (μDSC) to probe hemoglobin structural changes, previously unreported large exothermic events have been repeatedly detected at temperatures below the tertiary-to-secondary structural transition temperature (ca. 72 °C), which could be important in understanding protein subunit association. Given the importance of protein–protein interactions and protein solution stability, this event was characterized with respect to concentration and scan rate. This detailed analysis revealed the formation of aggregates that differed in size, appearance, and settling time. While repeat μDSC scans confirmed that this aggregation event was irreversible when samples were heated beyond 55 °C, it was also found that aggregation could be prevented through the addition 0.02 M urea. All evidence points to a significant occurrence of a kinetic pathway that leads to an intermediate aggregation event that is believed to be formed from dissociated hemoglobin subunits.
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Acknowledgements
We would like to thank Dr. A. Penlidis for permitting us to use the PSA; Hongyuan He for helping to establish the initial protocols of this work and providing valuable advice in experimental procedures; Joel S. Thompson for his help in running experiments, Yung Priscilla Lai for her editorial comments on this manuscript, and Stanislav Sokolenko for help with figures. This work was jointly supported by NSERC Discovery Grants to KCT and MGA.
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This work is being submitted posthumously for the first author YeongHo Suh.
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Suh, Y., Kim, B.J., Tam, K.C. et al. Detection and characterization of hemoglobin dissociation and aggregation using microcalorimetry. J Therm Anal Calorim 115, 2159–2169 (2014). https://doi.org/10.1007/s10973-013-3424-5
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DOI: https://doi.org/10.1007/s10973-013-3424-5