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Int J Syst Evol Microbiol 54 (2004), 2043-2047; DOI  10.1099/ijs.0.63148-0
© 2004 International Union of Microbiological Societies

Clostridium straminisolvens sp. nov., a moderately thermophilic, aerotolerant and cellulolytic bacterium isolated from a cellulose-degrading bacterial community

Souichiro Kato1, Shin Haruta1, Zong Jun Cui1, Masaharu Ishii1, Akira Yokota2 and Yasuo Igarashi1

1 Department of Biotechnology, Graduate School of Agricultural and Life Sciences, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
2 Laboratory of Bioresources, Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan

Correspondence
Yasuo Igarashi
aigara{at}mail.ecc.u-tokyo.ac.jp

A novel anaerobic, thermophilic and cellulolytic bacterium (strain CSK1T) was isolated from a cellulose-degrading bacterial community. On the basis of 16S rRNA gene sequence similarity, strain CSK1T was mapped to cluster III of the genus Clostridium. Strain CSK1T is closely related to Clostridium thermocellum (96·2 %) and Clostridium aldrichii (95·1 %). Strain CSK1T is a non-motile, spore-forming, straight or slightly curved rod. The optimum temperature and initial pH for its growth and cellulose degradation are 50–55 °C and pH 7·5. Strain CSK1T grew under a gas phase containing up to 4 % O2. Phylogenetic and phenotypic analyses support the differentiation of strain CSK1T from its closest relatives. Strain CSK1T therefore represents a novel species, for which the name Clostridium straminisolvens sp. nov. is proposed, with CSK1T (=DSM 16021T=IAM 15070T) as the type strain.

Published online ahead of print on 7 May 2004 as DOI 10.1099/ijs.0.63148-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CSK1T is AB125279.




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