Insight into the metabolic potential and ecological function of a novel Magnetotactic Nitrospirota in coral reef habitat

Frontiers in Microbiology

Microbiology

Jianwei Chen¹  Wuchang Zhang²  Hongmiao Pan³  Wenyan Zhang³  Jia Liu³  Tian Xiao³  Kaixuan Cui⁴  Yicong Zhao⁴  Long-Fei Wu⁵  Wei Lin⁶ 

[1] BGI-Qingdao, BGI-Shenzhen, Qingdao, China;CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China;Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China;CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China;Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China;France-China Joint Laboratory for Evolution and Development of Magnetotactic Multicellular Organisms, Chinese Academy of Sciences, Beijing, China;CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China;Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China;University of Chinese Academy of Sciences, Beijing, China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China;France-China Joint Laboratory for Evolution and Development of Magnetotactic Multicellular Organisms, Chinese Academy of Sciences, Beijing, China;Aix Marseille University, CNRS, LCB, IM2B, IMM, Marseille, France;France-China Joint Laboratory for Evolution and Development of Magnetotactic Multicellular Organisms, Chinese Academy of Sciences, Beijing, China;Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;

关键词: Magnetotactic bacteria;    Nitrospirota;    metabolic potential;    coral ecosystems;    ecological functions;   

DOI  :  10.3389/fmicb.2023.1182330

 received in 2023-03-08, accepted in 2023-04-21,  发布年份 2023

来源: Frontiers

【 摘 要 】

Magnetotactic bacteria (MTB) within the Nitrospirota phylum play important roles in biogeochemical cycles due to their outstanding ability to biomineralize large amounts of magnetite magnetosomes and intracellular sulfur globules. For several decades, Nitrospirota MTB were believed to only live in freshwater or low-salinity environments. While this group have recently been found in marine sediments, their physiological features and ecological roles have remained unclear. In this study, we combine electron microscopy with genomics to characterize a novel population of Nitrospirota MTB in a coral reef area of the South China Sea. Both phylogenetic and genomic analyses revealed it as representative of a novel genus, named as Candidatus Magnetocorallium paracelense XS-1. The cells of XS-1 are small and vibrioid-shaped, and have bundled chains of bullet-shaped magnetite magnetosomes, sulfur globules, and cytoplasmic vacuole-like structures. Genomic analysis revealed that XS-1 has the potential to respire sulfate and nitrate, and utilize the Wood–Ljungdahl pathway for carbon fixation. XS-1 has versatile metabolic traits that make it different from freshwater Nitrospirota MTB, including Pta-ackA pathway, anaerobic sulfite reduction, and thiosulfate disproportionation. XS-1 also encodes both the cbb3-type and the aa3-type cytochrome c oxidases, which may function as respiratory energy-transducing enzymes under high oxygen conditions and anaerobic or microaerophilic conditions, respectively. XS-1 has multiple copies of circadian related genes in response to variability in coral reef habitat. Our results implied that XS-1 has a remarkable plasticity to adapt the environment and can play a beneficial role in coral reef ecosystems.

【 授权许可】

Unknown   
Copyright © 2023 Zhao, Zhang, Pan, Chen, Cui, Wu, Lin, Xiao, Zhang and Liu.