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Int J Syst Evol Microbiol 58 (2008), 1064-1068; DOI  10.1099/ijs.0.65416-0
© 2008 International Union of Microbiological Societies

Caenimonas koreensis gen. nov., sp. nov., isolated from activated sludge

Seung Hyun Ryu1,{dagger}, Dae Sung Lee2,{dagger}, Minjeong Park1, Qian Wang1, Ho Hee Jang1, Woojun Park3 and Che Ok Jeon1,4

1 Division of Applied Life Science (BK21 Program), EB-NCRC, PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
2 Department of Environmental Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea
3 Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-701, Republic of Korea
4 Department of Life Science, Chung-Ang University, Seoul 156-756, Republic of Korea

Correspondence
Che Ok Jeon
cojeon{at}gnu.ac.kr

A Gram-negative, rod-shaped bacterium, designated strain EMB320T, was isolated from activated sludge performing enhanced biological phosphorus removal in a sequencing batch reactor. The isolate was strictly aerobic and non-motile. Growth was observed between 10 and 35 °C (optimum 30 °C) and between pH 6.0 and 9.0 (optimum pH 7.0–8.0). The predominant cellular fatty acids of strain EMB320T were C16 : 0, C18 : 1{omega}7c and summed feature 3 (C16 : 1{omega}7c and/or iso-C15 : 0 2-OH). The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol. Strain EMB320T contained ubiquinone-8 (Q-8) as the major respiratory quinone system and 2-hydroxyputrescine and putrescine as the major polyamines, which suggests that it belongs to the Betaproteobacteria. The G+C content of the genomic DNA was 62.7 mol%. Comparative 16S rRNA gene sequence analysis showed that strain EMB320T formed a phyletic lineage distinct from other genera within the family Comamonadaceae. On the basis of chemotaxonomic data and molecular properties, strain EMB320T represents a novel genus and species within the family Comamonadaceae, for which the name Caenimonas koreensis sp. nov. is proposed. The type strain of Caenimonas koreensis is EMB320T (=KCTC 12616T =DSM 17982T).

Abbreviations: EBPR, enhanced biological phosphate removal

{dagger}These authors contributed equally to this work.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain EMB320T is DQ349098.

A transmission electron micrograph of cells and results of TLC of polar lipids of strain EMB320T and maximum-likelihood and maximum-parsimony 16S rRNA gene sequence-based phylogenetic trees are available as supplementary material with the online version of this paper.






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