Isolation and characterization of an early colonizing Rhizobium sp. R8 from a household toilet bowl
| Autor: | Mitsuhiro Gomi, Masaaki Morikawa, Toru Fukano, Yukihiko Osaki |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Urease
education Microbial Consortia Molecular Sequence Data Mannose Applied Microbiology and Biotechnology Biochemistry Analytical Chemistry Microbiology chemistry.chemical_compound RNA Ribosomal 16S Household Articles Molecular Biology Phylogeny biology Strain (chemistry) Base Sequence Organic Chemistry Polysaccharides Bacterial Biofilm General Medicine biology.organism_classification 16S ribosomal RNA chemistry Galactose Biofilms Nitrogen fixation biology.protein Rhizobium Biotechnology |
| Zdroj: | Bioscience, biotechnology, and biochemistry. 79(7) |
| ISSN: | 1347-6947 |
| Popis: | The bacterial community structure was compared between the third days’, one week’, and three weeks’ biofilm samples from the surface of a household toilet bowl. It was found that the PCR-DGGE band pattern of 16S rRNA gene was dramatically changed after the third day and was not further changed until three weeks. This result suggests that there are early and late colonizing bacterial groups. One of the early colonizers isolated from the third days’ sample was Rhizobium sp. R8, a closest relative to Rhizobium giardinii, which exhibited the highest biofilm formation activity in an artificial urine condition. R8 produced extracellular polysaccharides containing galactose, glucose, and mannose at the molar ratio of 8:1:1, which were probably responsible for the biofilm formation. Its excelled biofilm formation and urease activities together with the lack of nodulation and nitrogen fixing genes in R8 suggest that this strain has been specifically adapted to urine condition in a toilet bowl. |
| Databáze: | OpenAIRE |
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