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The effect of temperature on the activity and stability of the thermostable enzyme caffeine dehydrogenase from Pichia manshurica CD1

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A Correction to this article was published on 14 July 2023

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Abstract

A novel thermostable caffeine dehydrogenase enzyme was isolated from Pichia manshurica strain CD1. At increased temperatures, the enzyme caffeine dehydrogenase exhibits increased activity. The enzyme also exhibits high stability after the heat treatment and remains up to 56% stable at 100 ºC compared to its untreated condition. A Comprehensive analysis was carried out to monitor the thermodynamic parameters (Ea, ΔG, ΔH, and ΔS) of the enzyme. In this study, the conformational changes of caffeine dehydrogenase in native and thermally treated states were investigated by CD spectroscopy and intrinsic tryptophan fluorescence spectroscopy. The far-UV CD spectra results showed that the protein was able to maintain its alpha-helical structure after the heat treatment and the near-UV CD spectra results showed that temperature had no such effect on the protein’s tertiary structure. The results of tryptophan fluorescence spectroscopy of the enzyme showed a temperature-dependent dynamic quenching. The fluorescence intensity of the protein was decreased as the degree of freedom in the tryptophan- region of the protein was increased with temperature. Thus, the enzyme does not undergo denaturation at high temperatures and can maintain its conformation to remain catalytically active. Therefore, it can be concluded that the thermal stability of caffeine dehydrogenase is an essential key factor in increasing commercial interest due to its high catalytic efficiency and specificity.

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Acknowledgements

We thank Prof. Utpal Chandra Chaudhuri for kind help in critical reading of the manuscript. We also thank the State Government, Government of West Bengal for fellowship to RP.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Rubia Parvin: Conceptualization, Investigation, Methodology, Formal analysis, Data curation, draw all the graphs,Writing-original draft. Khushnood Fatma: Methodology, Data curation. Debbithi Bera: Methodology, Data curation. Jyotirmayee Dash: Methodology, Data curation. Joydeep Mukherjhee: Conceptualization, Writing-review & editing, Validation, Formal analysis. Ratan Gachhui: Supervision, Conceptualization, Writing-review & editing, Validation, Resources, Formal analysis.

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Correspondence to Ratan Gachhui.

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Parvin, R., Fatma, K., Bera, D. et al. The effect of temperature on the activity and stability of the thermostable enzyme caffeine dehydrogenase from Pichia manshurica CD1. Biologia 78, 3249–3258 (2023). https://doi.org/10.1007/s11756-023-01473-9

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  • DOI: https://doi.org/10.1007/s11756-023-01473-9

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