Purification and immobilization of engineered glucose dehydrogenase: A new approach to producing gluconic acid from breadwaste

Abstract

Background Platform chemicals are essential to industrial processes. Used as starting materials for the manufacture of diverse products, their cheap availability and efficient sourcing are an industrial requirement. Increasing concerns about the depletion of natural resources and growing environmental consciousness have led to a focus on the economics and ecological viability of bio-based platform chemical production. Contemporary approaches include the use of immobilized enzymes that can be harnessed to produce high-value chemicals from waste. Results In this study, an engineered glucose dehydrogenase (GDH) was optimized for gluconic acid (GA) production. Sulfolobus solfataricus GDH was expressed in Escherichia coli. The Km and Vmax values for recombinant GDH were calculated as 0.87 mM and 5.91 U/mg, respectively. Recombinant GDH was immobilized on a hierarchically porous silica support (MM-SBA-15) and its activity was compared with GDH immobilized on three commercially available supports. MM-SBA-15 showed significantly higher immobilization efficiency (> 98%) than the commercial supports. After 5 cycles, GDH activity was at least 14% greater than the remaining activity on commercial supports. Glucose in bread waste hydrolysate was converted to GA by free-state and immobilized GDH. After the 10th reuse cycle on MM-SBA-15, a 22% conversion yield was observed, generating 25 gGA/gGDH. The highest GA production efficiency was 47 gGA/gGDH using free-state GDH. Conclusions This study demonstrates the feasibility of enzymatically converting BWH to GA: immobilizing GDH on MM-SBA-15 renders the enzyme more stable and permits its multiple reuse.

Publication DOI: https://doi.org/10.1186/s13068-020-01735-7
Divisions: College of Health & Life Sciences > School of Biosciences
College of Health & Life Sciences > School of Biosciences > Cellular and Molecular Biomedicine
College of Health & Life Sciences
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Funding: This research was funded by the Biotechnology and Biological Sciences Research Council (BBSRC) through the Global Challenges Research Fund Project, CAPRI-BIO (BB/P022685/1). RM is supported by a BBSRC training grant with Chemoxy Ltd (BB/M016668/1).
Uncontrolled Keywords: Enzyme,Immobilization,Recombinant protein,Waste valorization,Biotechnology,Applied Microbiology and Biotechnology,Renewable Energy, Sustainability and the Environment,Energy(all),Management, Monitoring, Policy and Law
Full Text Link:
Related URLs: https://biotech ... 068-020-01735-7 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-06-03
Accepted Date: 2020-05-17
Authors: Karagoz, Pınar
Mandair, Ravneet
C. Manayil, Jinesh (ORCID Profile 0000-0002-9864-3332)
Lad, Jai
Chong, Katie (ORCID Profile 0000-0002-3800-8302)
Kyriakou, Georgios
Lee, Adam
Wilson, Karen
Bill, Roslyn (ORCID Profile 0000-0003-1331-0852)

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