Related Experiment Video
Updated: Oct 24, 2025
10:07
Growing Magnetotactic Bacteria of the Genus Magnetospirillum: Strains MSR-1, AMB-1 and MS-1
Published on: October 17, 2018
15.9K
Identification and Genomic Characterization of Two Previously Unknown Magnetotactic Nitrospirae
Wensi Zhang1,2,3, Yinzhao Wang4, Li Liu1,2,3
1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.
Frontiers in Microbiology
|August 13, 2021
Summary
Two new magnetotactic bacteria (MTB) populations within the Nitrospirae phylum were identified. These unculturable microbes, crucial for iron and sulfur cycling, expand our understanding of microbial diversity and ecophysiology in aquatic environments.
Area of Science:
- Microbiology
- Biogeochemistry
- Genomics
Background:
- Magnetotactic bacteria (MTB) biomineralize magnetic crystals (magnetosomes) in intracellular organelles.
- MTB within the Nitrospirae phylum are ecologically significant in aquatic iron and sulfur cycling but remain poorly understood due to being unculturable.
Purpose of the Study:
- To identify and characterize novel magnetotactic bacteria populations within the Nitrospirae phylum.
- To elucidate the phylogenomic diversity and ecophysiological potential of these uncultured MTB.
Main Methods:
- 16S rRNA gene-based analysis
- Genome-resolved metagenomics
- Comparative genomic analyses
Main Results:
- Two distinct MTB populations (rod-shaped XYR and coccoid XYC) were identified, representing a novel species and genus, respectively.
- High-quality draft genomes were reconstructed, proposing names *Candidatus* Magnetobacterium cryptolimnobacter and *Candidatus* Magnetomicrobium cryptolimnococcus.
- Comparative genomics revealed metabolic potential for CO2 fixation, sulfur cycling, and nitrogen cycling, alongside a conserved magnetosome gene cluster.
Conclusions:
- This study significantly expands the known diversity of magnetotactic Nitrospirae.
- The findings provide novel insights into the ecophysiology and adaptive roles of this important group of bacteria in aquatic ecosystems.
Related Concept Videos
01:18Other Unique Bacteria
153
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
153
01:24Diversity of Archaea II
187
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
187
01:24Bacterial Phylum Tenericutes
184
The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
184
01:28Anoxygenic Phototrophic Bacteria
294
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
294
01:21Hyperthermophilic Bacteria
164
Domain Bacteria includes some unique hyperthermophilic species. They exhibit remarkable adaptations that enable survival in extreme environments.Thermotoga species are rod-shaped, gram-negative, non-sporulating hyperthermophiles that form a sheath-like envelope called a toga. They ferment sugars or starch, producing lactate, acetate, CO₂, and H₂, and can also grow via anaerobic respiration using H₂ and ferric iron. Found in hot springs and hydrothermal vents, over 20% of their...
164
01:30Bacterial Phylum Spirochaetes
217
Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
217