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Metabolic Engineering of Yeast for the Production of Fuels and Chemicals

A special issue of Fermentation (ISSN 2311-5637). This special issue belongs to the section "Microbial Metabolism, Physiology & Genetics".

Deadline for manuscript submissions: 30 October 2024 | Viewed by 667

Special Issue Editor


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Guest Editor
Department of Biotechnology and Chemistry, Faculty of Engineering, Kindai University, Higashi-Hiroshima 739-2116, Hiroshima, Japan
Interests: life sciences; applied microbiology; co-fermentation; ethanol

Special Issue Information

Dear Colleagues,

Over the past decade, synthetic biology has flourished, and metabolic engineering approaches have been developed for the production of different bio-products through biotechnology (i.e., bio-manufacturing) using microorganisms. On the other hand, circular economies are becoming more important, and there is a need to reduce the burden on the environment by circulating raw materials and products while keeping their value as high as possible. Expectations are high for biorefineries and recycling technologies that produce products using sustainable biomass as raw materials, and investment in research and development is accelerating.

Microbial production of fuels and chemicals from renewable resources such as lignocellulosic biomass provides sustainable and economically attractive alternatives to their petrochemical-based production by conventional oil refineries. The yeast Saccharomyces cerevisiae is the most promising candidate for the industrial-scale production of fuels, particularly bioethanol, and chemicals, while non-conventional yeasts are emerging as suitable hosts for industrial applications. It is also important that yeasts are tolerant to extreme fermentation conditions, biomass-derived inhibitors, and their target products and by-products.

This Special Issue focuses on the breeding of yeast, which is the core of bio-manufacturing, and provides an overview of elemental technologies and examples of manufacturing. Yeast is highly diverse, and its products are varied and used for a variety of purposes, but breeding methods differ depending on the yeast species, so extensive research is essential. Furthermore, progress is being made in the development of manufacturing technology for bio-products that are not originally produced by yeast, in which the introduction of novel pathways and the optimization of its native cellular processes via metabolic engineering are rapidly expanding its range of cell-factory applications.

In this Special Issue, we aim to introduce recent scientific progress in metabolic engineering strategies of various yeasts for the production of bioethanol, advanced biofuels, and chemicals.

Prof. Dr. Akinori Matsushika
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fermentation is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metabolic engineering
  • fuels
  • chemicals
  • Saccharomyces cerevisiae
  • non-conventional yeasts
  • lignocellulosic biomass

Published Papers (1 paper)

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Research

12 pages, 1315 KiB  
Article
Inhibitor Tolerance Capacity of Pichia kudriavzevii NBRC1279 and NBRC1664
by Hironaga Akita and Akinori Matsushika
Fermentation 2024, 10(7), 331; https://doi.org/10.3390/fermentation10070331 - 25 Jun 2024
Viewed by 348
Abstract
The thermotolerant yeast Pichia kudriavzevii (previously known as Issatchenkia orientalis), can produce ethanol from a variety of carbon sources and grows at around 45 °C. Thus, this yeast is considered a useful biocatalyst for producing ethanol from lignocellulose through simultaneous saccharification and [...] Read more.
The thermotolerant yeast Pichia kudriavzevii (previously known as Issatchenkia orientalis), can produce ethanol from a variety of carbon sources and grows at around 45 °C. Thus, this yeast is considered a useful biocatalyst for producing ethanol from lignocellulose through simultaneous saccharification and fermentation (SSF). SSF has several advantages, such as a simplified manufacturing process, ease of operation and reduced energy input. Using P. kudriavzevii NBRC1279 and NBRC1664, we previously succeeded in producing ethanol through SSF; however, the extent to which inhibitors by-produced from lignocellulose hydrolysis affect the growth and ethanol productivity of the two strains remains to be investigated. In this study, to better understand the inhibitor tolerance capacity of the two strains, spot assay, growth experiment, real-time quantitative PCR (RT-qPCR) analysis and multiple sequence alignment analysis were carried out. When P. kudriavzevii NBRC1279 and NBRC1664, as well as Saccharomyces cerevisiae BY4742 as a control, were cultured on SCD plates containing 17% ethanol, 42 mM furfural, 56 mM 5-hydroxymethylfurfural (HMF) or 10 mM vanillin, only P. kudriavzevii NBRC1664 was able to grow under all conditions. Moreover, the inhibitor tolerance capacity of P. kudriavzevii NBRC1664 was greater than those of other strains using SCD medium containing the same concentrations of various inhibitors. When an RT-qPCR analysis of seven gene sequences from aldehyde dehydrogenase and the aldehyde dehydrogenase family protein (ADHF) was performed using P. kudriavzevii NBRC1664 cultivated in the presence of 56 mM HMF, ADHF1 and ADHF2 were up-regulated in the early logarithmic growth phase. Moreover, a multiple sequence alignment of the amino acid sequences of ADHF1, ADHF2 and the known ADH suggested that ADHF1 and ADHF2 may catalyze the reversible NAD+-dependent oxidation of HMF. Our data may be useful for future studies on the metabolic engineering of more useful strains for ethanol production from lignocellulose. Full article
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