Related Experiment Video
Updated: Jun 20, 2026
07:20
Bioprospecting of Extremophilic Microorganisms to Address Environmental Pollution
Published on: December 30, 2021
Sphingopyxis soli sp. nov., isolated from landfill soil
Jung-Hye Choi1, Min-Soo Kim2,1, Mi-Ja Jung1
1Department of Life and Nanopharmaceutical Sciences and Department of Biology, Kyung Hee University, Seoul 130-701, Republic of Korea.
International Journal of Systematic and Evolutionary Microbiology
|September 8, 2009
Summary
A novel bacterium, Sphingopyxis soli sp. nov., was identified from landfill soil. This motile, aerobic bacterium exhibits unique fatty acid profiles and represents a new species within the Sphingopyxis genus.
Area of Science:
- Microbiology
- Bacteriology
- Environmental Microbiology
Background:
- The genus Sphingopyxis encompasses Gram-negative bacteria with diverse environmental roles.
- Isolation and characterization of novel bacterial species are crucial for understanding microbial diversity and ecological functions.
- Landfill soil represents a unique environment for microbial adaptation and discovery.
Purpose of the Study:
- To isolate and characterize a novel bacterium from landfill soil.
- To determine the taxonomic position of the isolated strain using polyphasic characterization.
- To propose a new species within the genus Sphingopyxis.
Main Methods:
- Isolation and cultivation of bacteria from landfill soil.
- Phenotypic characterization including morphology, growth conditions, and biochemical tests (oxidase, catalase).
- Chemotaxonomic analysis (fatty acids, ubiquinones, polar lipids, polyamines).
- Phylogenetic analysis based on 16S rRNA gene sequencing.
- DNA-DNA hybridization and DNA G+C content determination.
Main Results:
- A novel Gram-negative, aerobic, rod-shaped, motile bacterium, strain BL03(T), was isolated.
- Strain BL03(T) showed distinct physiological characteristics, including optimal growth conditions and unique major cellular fatty acids (C(17 : 1)omega6c, C(15 : 0) 2-OH, C(18 : 1)omega7c).
- Phylogenetic analysis placed strain BL03(T) within the genus Sphingopyxis, but DNA-DNA relatedness values (10.3–40.3 %) were below the threshold for species delineation with closely related type strains.
Conclusions:
- Strain BL03(T) represents a distinct genotypic and phenotypic entity.
- The data support the classification of strain BL03(T) as a novel species within the genus Sphingopyxis.
- The proposed name for the novel species is Sphingopyxis soli sp. nov., with strain BL03(T) as the type strain.
Related Concept Videos
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:27Microbial Leaching
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
01:27Diversity of Archaea III
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like environments.Morphological...
01:26Bacterial Phylum Planctomycetes
Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...
01:27The Winogradsky Column
A Winogradsky column provides a powerful tool for studying microbial ecology and metabolic interactions in a stratified, self-contained environment. This artificial ecosystem, developed by Sergei Winogradsky in the late 19th century, replicates the complex biogeochemical gradients found in natural sediments, allowing researchers to observe microbial succession and interactions over time.The column is typically assembled in a transparent glass cylinder filled halfway with sediment mixed with...
01:29Soil Microbial Ecology
Soil microbial ecology is defined by highly diverse, spatially structured communities that drive nutrient cycling, organic matter turnover, and overall ecosystem stability. Although a gram of soil can contain thousands of bacterial and archaeal taxa, the ecological processes they mediate are even more crucial for sustaining terrestrial life.Microhabitats and NichesSoil is a heterogeneous mixture of minerals, organic matter, water, and air. Microbes inhabit distinct microhabitats formed by...