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1 Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Aoba-yama 07, Sendai, Miyagi 980-8579, Japan
2 Research Laboratory, Higeta Shoyu Co. Ltd, Choshi, Chiba 288, Japan
Correspondence
Tokuzo Nishino
nishino{at}mail.cc.tohoku.ac.jp
An acidophilic, slightly thermophilic bacterium, designated strain NTAP-1T, that produces a thermostable extracellular acid collagenase activity with potential industrial applications was isolated from soil of Aoba-yama Park, Sendai, Japan. The temperature range for growth was 40–65 °C, with an optimum at 55 °C, and the pH range for growth was 2·5–6·5, with an optimum at pH 5·5. Analysis of the 16S rDNA sequence of strain NTAP-1T showed that it is most closely related to strains of the genus Alicyclobacillus. Consistently, the major constituents of the cell-membrane lipid of strain NTAP-1T were 
-alicyclic fatty acids. However, DNA–DNA reassociation studies showed only low similarities (less than 33 %) to any type strain of Alicyclobacillus. On the basis of the phenotypic and genotypic properties, a novel species is proposed, Alicyclobacillus sendaiensis sp. nov., represented by strain NTAP-1T (=JCM 11817T =ATCC BAA-609T).
The DDBJ accession number for the 16S rDNA sequence of strain NTAP-1T is AB084128.
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