Chemolithoautotrophic Microorganisms—Pioneers of Biospheric Evolution and Sustainable Biotechnology

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

Deadline for manuscript submissions: 31 August 2026 | Viewed by 215

Special Issue Editor


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Guest Editor
Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, Ministry of Natural Resources of PR China, Xiamen 361005, China
Interests: chemolithoautotrophic; campylobacterota

Special Issue Information

Dear Colleagues,

Because Earth's evolutionary trajectory unfolded over billions of years, the emergence of primordial life forms represents a crucial aspect of scientific inquiry. Chemolithoautotrophs, potentially Earth's earliest life forms, have emerged as critical model systems for elucidating the primordial mechanisms underlying biogenesis and early biological evolution. These remarkable organisms maintain an unparalleled ecological ubiquity, thriving across habitats that range from terrestrial soils and aquatic ecosystems to extreme environments; this includes deep-sea hydrothermal vents, cold seeps, acid mine drainage systems, and subsurface lithospheric zones.

Their evolutionary success is fundamentally rooted in unique metabolic strategies that drive global biogeochemical cycles, such as carbon, nitrogen, sulfur, hydrogen, metals, and so on. This metabolic versatility positions these microorganisms at the interface of multiple scientific disciplines, from astrobiology and paleogeochemistry to modern ecosystem modeling.

Contemporary research has revealed their extensive biotechnological potential via several groundbreaking discoveries:

(1) The development of bioleaching technologies for sustainable metal recovery;

(2) Innovative approaches to the environmental bioremediation of contaminated sites;

(3) Bioenergy production through microbial fuel cell optimization;

(4) Carbon sequestration strategies that leverage autotrophic carbon fixation pathways;

(5) The production of single-cell proteins.

This Special Issue seeks to compile cutting-edge research that spans the following topics:

- Genomic and phylogenetic investigations of ancient metabolic pathways;

- Novel mechanisms of chemolithotrophic energy conservation;

- Extreme environmental adaptation strategies;

- Microbial–mineral interactions ;

- Industrial applications in circular bioeconomy frameworks;

- The astrobiological implications of the detection of extraterrestrial life.

We welcome contributions that employ multidisciplinary approaches—from molecular phylogenetics and synthetic biology to geochemical analytics and computational modeling—that advance our understanding of these extraordinary microorganisms. Both fundamental research and applied technological innovations will be considered, including studies that associated evolutionary insights with modern biotechnological applications.

Through this collection, we aim to establish new paradigms for understanding life's origins and develop sustainable solutions to contemporary challenges in environmental management, industrial processes, and climate change mitigation.

Dr. Lijing Jiang
Guest Editor

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Keywords

  • chemolithoautotrophic microorganisms
  • ancient metabolic pathways
  • extreme environmental
  • microbial–mineral interactions
  • industrial applications
  • extraterrestrial life

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Published Papers (1 paper)

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19 pages, 2935 KB  
Article
Isolation and Screening of Hydrogen-Oxidizing Bacteria from Mangrove Sediments for Efficient Single-Cell Protein Production Using CO2
by Xiaxing Cao, Liang Cui, Shuai Sun, Tingzhao Li, Yong Wang, Shasha Wang, Rongfeng Hong, Pufan Xu, Xuewen Gao, Lijing Jiang and Zongze Shao
Microorganisms 2026, 14(2), 346; https://doi.org/10.3390/microorganisms14020346 - 2 Feb 2026
Abstract
The escalating global demand for large-scale, cost-effective, and sustainable high-quality protein has positioned single-cell protein (SCP) production from one-carbon (C1) gases as a highly promising solution. In this study, eight chemolithoautotrophic hydrogen-oxidizing bacteria (HOB) were isolated from mangrove sediments. Based on the 16S [...] Read more.
The escalating global demand for large-scale, cost-effective, and sustainable high-quality protein has positioned single-cell protein (SCP) production from one-carbon (C1) gases as a highly promising solution. In this study, eight chemolithoautotrophic hydrogen-oxidizing bacteria (HOB) were isolated from mangrove sediments. Based on the 16S rRNA gene sequence analysis, they belonged to genera Sulfurimonas, Sulfurovum, Thiomicrolovo, and Marinobacterium. Among these, Thiomicrolovo sp. ZZH C-3 was identified as the most promising candidate for SCP production based on the highest biomass and protein content, and was selected for further characterization. Strain ZZH C-3 is a Gram-negative, short rod-shaped bacterium with multiple flagella. It can grow chemolithoautotrophically by using molecular hydrogen as an energy source and molecular oxygen as an electron acceptor. Genomic analysis further confirmed that ZZH C-3 harbors a complete reverse tricarboxylic acid (rTCA) cycle gene set for carbon fixation, and diverse hydrogenases (Group I, II, IV) for hydrogen oxidation. Subsequently, its cultivation conditions and medium composition for SCP production were systematically optimized using single-factor experiments and response surface methodology (RSM). Results showed that the optimal growth conditions were 28 °C, pH 7.0, and with 1 g/L (NH4)2SO4 as the nitrogen source, 5–10% oxygen concentration, 9.70 mg/L FeSO4·7H2O, 0.17 g/L CaCl2·2H2O, and 1.90 mg/L MnSO4·H2O. Under the optimized conditions, strain ZZH C-3 achieved a maximum specific growth rate of 0.46 h−1. After 28 h of cultivation, the optical density at 600 nm (OD600) reached 0.94, corresponding to a biomass concentration of 0.60 g/L, and the protein content ranked at 73.56%. The biomass yield on hydrogen (YH2) was approximately 3.01 g/g H2, with an average H2-to-CO2 consumption molar ratio of about 3.78. Compared to the model HOB Cupriavidus necator, strain ZZH C-3 exhibited a lower H2/CO2 consumption ratio, superior substrate conversion efficiency, and high protein content. Overall, this study not only validated the potential of mangrove HOB for SCP production but also offers new insights for future metabolic engineering strategies designed to enhance CO2-to-biomass conversion efficiency. Full article
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