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Bioprocesses and Biotechnology Related to Extremophiles—Molecular Aspects

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Microbiology".

Deadline for manuscript submissions: 20 September 2024 | Viewed by 1436

Special Issue Editors


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Guest Editor
Department of Biology, Università degli Studi di Napoli Federico II, 80138 Napoli, Italy
Interests: thermophilic microorganisms; microbial consortia; biopolymers; microbial bioprocesses; microbial cell factories; genomic and omic analyses
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Guest Editor
Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126 Naples, Italy
Interests: microalgae biorefinery; high-value products; antioxidants

Special Issue Information

Dear Colleagues,

Over the last decades, the number of isolated and sequenced extremophiles has drastically increased. Since extremophiles thrive in harsh environments, the study of their metabolic pathways and enzymes has gained interest owing to their ability to catalyze reactions under severe industrial conditions. Currently, extremozymes from thermophilic, psychrophilic alkaliphilic, acidophilic, and halophilic microorganisms are employed in several biotechnological processes. These cell biocatalysts or their enzymes are applied in different fields such as wastewater treatment, resource recovery, bioremediation, and for the production of biofuels and biochemicals. To date, metabolic engineering and synthetic biology technologies for high-efficiency bioprocess applications are also introduced.

This Special Issue is supervised by Dr. Martina Aulitto (Guest Editor) and Dr. Paola Imbimbo (Co-Guest Editor) and assisted by our Topical Advisory Panel Member Dr. Giovanni Gallo (Ludwig-Maximilians University Munich). The aim is to collect original research articles, review articles, and short communications dealing with the comprehensive application of extremophiles and extremozymes in biotechnological bioprocesses.

Dr. Martina Aulitto
Dr. Paola Imbimbo
Guest Editors

Manuscript Submission Information

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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. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • waste circularity
  • plastic recycle
  • lignocellulose
  • extremozymes
  • microbial ecology
  • microbial bioprocess

Published Papers (2 papers)

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Research

17 pages, 2768 KiB  
Article
Transcriptome Analysis Reveals the Important Role of Vitamin B12 in the Response of Natronorubrum daqingense to Salt Stress
by Qi Wang, Zhiwei Wang, Jiaqi Guan and Jinzhu Song
Int. J. Mol. Sci. 2024, 25(8), 4168; https://doi.org/10.3390/ijms25084168 - 10 Apr 2024
Viewed by 295
Abstract
Natronorubrum daqingense JX313T is an extremely halophilic archaea that can grow in a NaCl-saturated environment. The excellent salt tolerance of N. daqingense makes it a high-potential candidate for researching the salt stress mechanisms of halophilic microorganisms from Natronorubrum. In this study, [...] Read more.
Natronorubrum daqingense JX313T is an extremely halophilic archaea that can grow in a NaCl-saturated environment. The excellent salt tolerance of N. daqingense makes it a high-potential candidate for researching the salt stress mechanisms of halophilic microorganisms from Natronorubrum. In this study, transcriptome analysis revealed that three genes related to the biosynthesis of vitamin B12 were upregulated in response to salt stress. For the wild-type (WT) strain JX313T, the low-salt adaptive mutant LND5, and the vitamin B12 synthesis-deficient strain ΔcobC, the exogenous addition of 10 mg/L of vitamin B12 could maximize their cell survival and biomass in both optimal and salt stress environments. Knockout of cobC resulted in changes in the growth boundary of the strain, as well as a significant decrease in cell survival and biomass, and the inability to synthesize vitamin B12. According to the HPLC analysis, when the external NaCl concentration (w/v) increased from 17.5% (optimal) to 22.5% (5% salt stress), the intracellular accumulation of vitamin B12 in WT increased significantly from (11.54 ± 0.44) mg/L to (15.23 ± 0.20) mg/L. In summary, N. daqingense is capable of absorbing or synthesizing vitamin B12 in response to salt stress, suggesting that vitamin B12 serves as a specific compatible solute effector for N. daqingense during salt stress. Full article
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16 pages, 3239 KiB  
Article
Characterization of Two Na+(K+, Li+)/H+ Antiporters from Natronorubrum daqingense
by Qi Wang, Mengwei Qiao and Jinzhu Song
Int. J. Mol. Sci. 2023, 24(13), 10786; https://doi.org/10.3390/ijms241310786 - 28 Jun 2023
Cited by 1 | Viewed by 824
Abstract
The Na+/H+ antiporter NhaC family protein is a kind of Na+/H+ exchanger from the ion transporter (IT) superfamily, which has mainly been identified in the halophilic bacteria of Bacillus. However, little is known about the Na [...] Read more.
The Na+/H+ antiporter NhaC family protein is a kind of Na+/H+ exchanger from the ion transporter (IT) superfamily, which has mainly been identified in the halophilic bacteria of Bacillus. However, little is known about the Na+/H+ antiporter NhaC family of proteins in the extremely halophilic archaea. In this study, two Na+/H+ antiporter genes, nhaC1 and nhaC2, were screened from the genome of Natronorubrum daqingense based on the gene library and complementation of salt-sensitive Escherichia coli KNabc. A clone vector pUC18 containing nhaC1 or nhaC2 could make KNabc tolerate 0.6 M/0.7 M NaCl or 30 mM/40 mM LiCl and a pH of up to 8.5/9.5, respectively. Functional analysis shows that the Na+(K+, Li+)/H+ antiport activities of NhaC1 and NhaC2 are both pH-dependent in the range of pH 7.0–10.0, and the optimal pH is 9.5. Phylogenetic analysis shows that both NhaC1 and NhaC2 belong to the Na+/H+ antiporter NhaC family of proteins and are significantly distant from the identified NhaC proteins from Bacillus. In summary, we have identified two Na+(K+, Li+)/H+ antiporters from N. daqingense. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: The undeniable potential of thermophiles in industrial bioprocesses

Abstract: Extremophilic microorganisms play a key role in understanding how life on Earth originate and evolved over centuries. Their ability to thrive in harsh environments rely in a plethora of mechanisms developed to survive at extreme temperature, pressures, salinity, and pH values. From a biotechnological point of view thermophiles are considered a robust tool for synthetic biology as well as a reliable starting material for the development of sustainable bioprocesses.  This mini review discusses the current progresses in biomanufacturing of high added bioproducts from thermophilic microorganisms and their industrial application.

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