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The Effect of Trifluoroethanol on Tyrosinase Activity and Conformation: Inhibition Kinetics and Computational Simulations

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Abstract

We studied the inhibitory effects of trifluoroethanol (TFE) on the activity and conformation of tyrosinase. TFE increased the degree of secondary structure of tyrosinase, which directly resulted in enzyme inactivation. A reciprocal study showed that TFE inhibited tyrosinase in a slope-parabolic mixed-type inhibition manner (K I = 0.5 ± 0.096 M). Time-interval kinetic studies showed that the inhibition was best described as first order with biphasic processes. Intrinsic and 1-anilinonaphthalene-8-sulfonate-binding fluorescences were also measured to gain more insight into the supposed structural changes; these showed that TFE induced a conspicuous tertiary structural change in tyrosinase by exposing hydrophobic surfaces. We also predicted the tertiary structure of tyrosinase and simulated its docking with TFE. The docking simulation was successful with significant scores (binding energy for Autodock4 = −4.75 kcal/mol; for Dock6 = −23.07 kcal/mol) and suggested that the TRP173 residue was mainly responsible for the interaction with TFE. Our results provide insight into the structure of tyrosinase and allow us to describe a new inhibition strategy that works by inducing conformational changes rather than targeting the active site of the protein.

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Abbreviations

DOPA:

3,4-Dihydroxyphenylalanine

TFE:

2,2,2-Trifluoroethanol

ANS:

1-Anilinonaphthalene-8-sulfonate

CD:

Circular dichroism

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Acknowledgements

This study was supported by a grant from the National Basic Research Program of China (no. 2006CB504100). Dr. Yong-Doo Park was supported by fund from the Science and Technology Planning Project of Jiaxing (no. 2008AZ1024), Zhejiang. Dr. Jun-Mo Yang was supported by the grants of the Korea Health 21 R&D Project (Ministry of Health, Welfare and Family Affairs, Republic of Korea, 01-PJ3-PG6-01GN12-0001 and A030003).

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Authors and Affiliations

  1. Department of Environmental Health, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, 510515, People’s Republic of China

    Zhi-Rong Lü, Long Shi, Yong-Doo Park, Hong-Wei Zhou & Fei Zou

  2. School of Medicine, Shenzhen University, Shenzhen, 518060, People’s Republic of China

    Jun Wang

  3. Korean BioInformation Center (KOBIC), KRIBB, Daejeon, 305-806, Korea

    Daeui Park & Jong Bhak

  4. Department of Dermatology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, 135-710, Korea

    Jun-Mo Yang

  5. Yangtze Delta Region Institute, Tsinghua University, Jiaxing, 314050, People’s Republic of China

    Yong-Doo Park

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  1. Zhi-Rong Lü
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Correspondence to Hong-Wei Zhou or Fei Zou.

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Lü, ZR., Shi, L., Wang, J. et al. The Effect of Trifluoroethanol on Tyrosinase Activity and Conformation: Inhibition Kinetics and Computational Simulations. Appl Biochem Biotechnol 160, 1896–1908 (2010). https://doi.org/10.1007/s12010-009-8730-9

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