Shin, Jieun and Gray, Harry B. and Winkler, Jay R. (2020) Stability/activity tradeoffs in Thermusthermophilus HB27 laccase. Journal of Biological Inorganic Chemistry, 25 (2). pp. 233-238. ISSN 0949-8257. PMCID PMC7085441. doi:10.1007/s00775-020-01754-7. https://resolver.caltech.edu/CaltechAUTHORS:20200402-121027505
![[img]](https://authors.library.caltech.edu/style/images/fileicons/application_pdf.png) |
PDF
- Supplemental Material
See Usage Policy. 1MB |
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20200402-121027505
Abstract
We report the temperature dependence of the formal potential of type 1 copper (Cu_(T1)) in Thermusthermophilus HB27 laccase. Employing [Ru(NH₃)₄ (bpy)](PF₆)₂ (0.505 vs. NHE) as the redox titrant, we found that the Cu_(T1)^(2+/+) potential decreased from approximately 480 to 420 mV (vs. NHE) as the temperature was raised from 20 to 65 °C. Of importance is that the ΔS_(rc)° of − 120 J mol⁻¹ K⁻¹ is substantially more negative than those for other blue copper proteins. We suggest that the highly unfavorable reduction entropy is attributable to CuT1 inaccessibility to the aqueous medium. Although the active site residues are buried, which is critical for maintaining thermostability, the flexibility around Cu_(T1) is maintained, allowing enzyme activity at ambient temperature.
| Item Type: | Article | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Related URLs: |
| ||||||||||||
| ORCID: |
| ||||||||||||
| Additional Information: | © 2020 Springer Nature Switzerland AG. Received 04 November 2019; Accepted 25 December 2019; Published 22 January 2020. Research reported in this publication was supported by the National Institute of Diabetes and Digestive and Kidney Diseases of the National Institutes of Health under award number R01DK019038. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. Additional support for this research was provided by the Arnold and Mabel Beckman Foundation. | ||||||||||||
| Funders: |
| ||||||||||||
| Subject Keywords: | Electron transfer; Thermodynamics; Thermophile | ||||||||||||
| Issue or Number: | 2 | ||||||||||||
| PubMed Central ID: | PMC7085441 | ||||||||||||
| DOI: | 10.1007/s00775-020-01754-7 | ||||||||||||
| Record Number: | CaltechAUTHORS:20200402-121027505 | ||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200402-121027505 | ||||||||||||
| Official Citation: | Shin, J., Gray, H.B. & Winkler, J.R. Stability/activity tradeoffs in Thermusthermophilus HB27 laccase. J Biol Inorg Chem 25, 233–238 (2020). https://doi.org/10.1007/s00775-020-01754-7 | ||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
| ID Code: | 102267 | ||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||
| Deposited On: | 02 Apr 2020 19:20 | ||||||||||||
| Last Modified: | 16 Nov 2021 18:10 |
Repository Staff Only: item control page
