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Int J Syst Evol Microbiol 57 (2007), 31-34; DOI  10.1099/ijs.0.64566-0
© 2007 International Union of Microbiological Societies

Simplicispira limi sp. nov., isolated from activated sludge

Shipeng Lu1, Seung Hyun Ryu1, Bok Sil Chung1, Young Ryun Chung1, Woojun Park2 and Che Ok Jeon1

1 Division of Applied Life Science, EB-NCRC, PMBBRC, Gyeongsang National University, Jinju 660-701, Republic of Korea
2 Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-701, Republic of Korea

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

A Gram-negative, motile, rod-shaped bacterium, designated strain EMB325T, was isolated from activated sludge that performed enhanced biological phosphorus removal in a sequencing batch reactor. The predominant fatty acids of strain EMB325T were summed feature 3 (C16 : 1{omega}7c and/or iso-C15 : 0 2-OH), C16 : 0, C18 : 1{omega}7c and C18 : 1{omega}7c 11-methyl. The strain contained phosphatidylethanolamine and diphosphatidylglycerol as polar lipids. The G+C content of the genomic DNA was 63.3 mol%. The major quinone was Q-8. Phylogenetic analysis of 16S rRNA gene sequences showed that strain EMB325T formed a phyletic lineage with members of the genus Simplicispira and was most closely related to Simplicispira psychrophila LMG 5408T and Simplicispira metamorpha DSM 1837T with similarities of 98.1 and 97.9 %, respectively. Levels of DNA–DNA relatedness between strain EMB325T and S. psychrophila LMG 5408T and S. metamorpha DSM 1837T were 28 and 23 %, respectively. On the basis of chemotaxonomic data and molecular characteristics, strain EMB325T is considered to represent a novel species within the genus Simplicispira, for which the name Simplicispira limi sp. nov. is proposed. The type strain is EMB325T (=KCTC 12608T=DSM 17964T).

Abbreviations: EBPR, enhanced biological phosphorus removal; SBR, sequencing batch reactor

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain EMB325T is DQ372987.

A transmission electron micrograph of cells of strain EMB325T is available as supplementary material in IJSEM Online.






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