M. van Loosdrecht
- Plasticicumulans acidivorans gen. nov., sp nov., a polyhydroxyalkanoate-accumulating gammaproteobacterium from a sequencing-batch bioreactor
- International Journal of Systematic and Evolutionary Microbiology
- Volume | Issue number
- 61 | 9
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Institute for Biodiversity and Ecosystem Dynamics (IBED)
Here, we describe a novel bacterium, strain TUD-YJ37T, which can accumulate polyhydroxybutyrate (PHB) to more than 85 % (w/w) dry cell weight. The bacterium was isolated from a mixed-culture bioreactor by using a feast-famine regime and its properties were characterized. Phylogenetic analysis based on full 16S rRNA gene sequences revealed that the isolate is a member of the Gammaproteobacteria, forming an independent, deep phylogenetic lineage. It is most closely related to members of the genera Methylocaldum, Methylococcus and Natronocella, with sequence similarities below 91 %. Strain TUD-YJ37T was an obligately aerobic, ovoid, Gram-negative bacterium, motile by means of a polar flagellum. It utilized C2-C10 fatty acids as carbon and energy sources. The temperature range for growth was 20-35 °C, with an optimum of 30 °C; the pH range was 6.0-8.0, without a clear optimum. The major respiratory quinone was Q-8. Polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, three unidentified phospholipids, an unidentified aminolipid and another unidentified lipid. The predominant fatty acids in the membrane polar lipids were C16 : 1ω7c, C16 : 0 and C18 : 1ω7c. The G+C content of the genomic DNA was 67.4 mol%. On the basis of phenotypic, chemotaxonomic and molecular data, the isolate is proposed to represent a novel genus and species, for which the name Plasticicumulans acidivorans gen. nov., sp. nov. is proposed. The type strain of Plasticicumulans acidivorans is TUD-YJ37T ( = DSM 23606T = CBS 122990T).
The GenBank/EMBL/DDBJ accession number for the 16S-rRNA gene sequence of strain TUD-YJ37T is GU206550.
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