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Microorganisms
Special Issues
Chemolithotrophic Microorganisms
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Chemolithotrophic Microorganisms

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Environmental Microbiology".

Deadline for manuscript submissions: closed (15 April 2025) | Viewed by 1403

Special Issue Editor

Dr. Jianfei Luo

E-Mail Website
Guest Editor
School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
Interests: chemoautotrophic microorganisms; biogeochemistry; microbial ecology

Special Issue Information

Dear Colleagues,

Chemoautotrophic microorganisms are widely distributed in natural and manmade ecosystems. They not only drive the element biogeochemical cycles on Earth, but also play important roles in bioremediation; however, due to the long generation times, extreme sensitivity to environmental factors, and close relationships with other microbes, chemoautotrophic microorganisms are usually difficult to isolate and cultivate in the laboratory, making many of them uncultivated and even unknown. Though some meta-omic technologies are now popularly used to obtain their genomes or predict their functions at the genomic and transcriptomic scales, studies at the cellular level and in pure culture are also essential to reveal the pathways involved in the biogeochemical cycles and screen some excellent strains for the bioremediation of pollutants in the environment.

The aim of this Special Issue is to collect some of the latest works in the field of chemoautotrophic microorganisms. It welcomes studies on (1) the enrichment, isolation, and characterization of chemoautotrophs; (2) (meta)genomic-, (meta)transcriptomic-, and/or (meta)proteomic-scale-based functional analyses of chemoautotrophs; (3) microbial interactions between chemoautotrophs and other microbes; and (4) the strategies or methods that are optimized to obtain chemoautotrophs from the environment.

Dr. Jianfei Luo
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. Microorganisms 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 2700 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

  • ammonia oxidizers, including AOB, AOA, comammox, and anammox
  • sulfur-oxidizing bacteria
  • nitrite-oxidizing bacteria
  • hydrogen-oxidizing bacteria
  • ferrous-oxidizing bacteria

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Published Papers (2 papers)

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Research

20 pages, 2955 KiB  
Article
Deep-Sea Cold Seep Campylobacterota: Diversity, Growth, Metabolic Characteristics, and Nutrient Production
by Xiaoman Yan, Qinglei Sun, Ke Xu, Jintao Zhuo, Yuanyuan Sun, Guowei Qian, Xin Zhang and Li Sun
Microorganisms 2025, 13(5), 1028; https://doi.org/10.3390/microorganisms13051028 - 29 Apr 2025
Abstract
Deep-sea chemosynthetic ecosystems, including cold seeps and hydrothermal vents, are widely spread in global oceans. Campylobacterota are important primary producers in deep-sea hydrothermal vents and serve as a vital food source for local invertebrates. However, the nutrients that these bacteria can provide to [...] Read more.
Deep-sea chemosynthetic ecosystems, including cold seeps and hydrothermal vents, are widely spread in global oceans. Campylobacterota are important primary producers in deep-sea hydrothermal vents and serve as a vital food source for local invertebrates. However, the nutrients that these bacteria can provide to their hosts are unclear. To date, research on Campylobacterota in cold seeps is very limited. Consequently, little is known about the biological features and ecological potential of Campylobacterota in cold seeps. In the present work, we examined the diversity, growth, metabolic characteristics, and nutrient production of Campylobacterota in a deep-sea cold seep. Over 1000 Campylobacterota ASVs, especially autotrophic Sulfurovum and Sulfurimonas, were identified. By optimizing the culture medium, 9 Sulfurovum and Sulfurimonas strains were isolated, including three potentially novel species. Two novel species were characterized and found to exhibit unique morphological features. These two novel strains possessed complete reverse tricarboxylic acid pathways. One novel strain, FCS5, was a psychrotolerant autotroph with denitrification and phosphorus-removing capacity. FCS5 could grow in the absence of vitamins. Consistently, metabolomics and transcriptome analyses indicated that FCS5 produced multiple vitamins, which regulated the expressions of a large number of genes associated with carbon fixation and multiple-nutrient synthesis. Besides vitamins, autotrophic Campylobacterota also produced abundant free amino acids, fatty acids (short-chain, medium, and long-chain), and proteins. This study indicates that the cold seep abounds with Campylobacterota, which are capable of providing various nutrients for the chemosynthetic ecosystem. In addition, these bacteria may have wide applications, such as in wastewater treatment and carbon emission reduction. Full article
(This article belongs to the Special Issue Chemolithotrophic Microorganisms)
14 pages, 2020 KiB  
Article
Thiobacter aerophilum sp. nov., a Thermophilic, Obligately Chemolithoautotrophic, Sulfur-Oxidizing Bacterium from a Hot Spring and Proposal of Thiobacteraceae fam. nov.
by Anna M. Dukat, Alexander G. Elcheninov, Alexandra A. Klyukina, Andrei A. Novikov and Evgenii N. Frolov
Microorganisms 2024, 12(11), 2252; https://doi.org/10.3390/microorganisms12112252 - 7 Nov 2024
Viewed by 1015
Abstract
An aerobic, obligately chemolithoautotrophic, sulfur-oxidizing bacterium, strain AK1T, was isolated from a terrestrial hot spring of the Uzon Caldera, Kamchatka, Russia. The cells of the new isolate were Gram-negative motile rods with a single polar flagellum. Strain AK1T grew at [...] Read more.
An aerobic, obligately chemolithoautotrophic, sulfur-oxidizing bacterium, strain AK1T, was isolated from a terrestrial hot spring of the Uzon Caldera, Kamchatka, Russia. The cells of the new isolate were Gram-negative motile rods with a single polar flagellum. Strain AK1T grew at 37–55 °C (optimum 50 °C) with 0–1.0% NaCl (optimum 0%) and within the pH range 4.8–7.0 (optimum pH 5.2–5.5). The new isolate was able to grow by aerobic respiration with sulfide, sulfur, or thiosulfate as the electron donor and HCO3−/CO2 as the carbon source. The major fatty acids were C16:0, C17:1 Δ, and C16:1 ω7c. The respiratory lipoquinone was ubiquinone UQ-8. The size of the genome and genomic DNA G+C content of the strain AK1T were 2.55 Mb and 64.0%, respectively. The closest 16S rRNA gene sequence of a validly published species belonged to Thiobacter subterraneus C55T (97.94% identity). According to the 16S rRNA gene sequence-based and conserved protein sequences-based phylogenetic analyses, strain AK1T represented a distinct lineage of the genus Thiobacter within a new family, Thiobacteraceae of the order Burkholderiales. As inferred from the morphology, physiology, chemotaxonomy, and phylogeny, strain AK1T ought to be recognized as a novel species for which we propose the name Thiobacter aerophilum sp. nov. The type strain is AK1T (=CGMCC 1.18099T = UQM 41819T). Full article
(This article belongs to the Special Issue Chemolithotrophic Microorganisms)
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