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Paenibacillus kribbensis sp. nov. and Paenibacillus terrae sp. nov., bioflocculants for efficient harvesting of algal cells

¹ Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea
² Department of Food and Life Science, Sungkyunkwan University, Chunchun-dong 300, Jangan-gu, Suwon, Korea
³ Probionic Corporation, Bio-venture Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea

Correspondence
Yong-Ha Park
yhpark{at}mail.kribb.re.kr

Two strains of Gram-variable, rod-shaped, endospore-forming, peritrichously flagellated, rod-shaped bacteria were isolated from a soil sample collected in Taejon City, Korea. The two strains (AM49^T and AM141^T) were found to be members of the genus Paenibacillus, on the basis of the results of phenotypic and phylogenetic analyses. Strains AM49^T and AM141^T were found to have a cell-wall peptidoglycan based on meso-diaminopimelic acid, MK-7 as their predominant menaquinone and anteiso-C_{15 : 0} as their major fatty acid. The DNA G+C contents of strains AM49^T and AM141^T were 48 and 47 mol%, respectively. The two strains formed distinct phylogenetic lineages within the radiation of the cluster comprising Paenibacillus spp. and a coherent cluster with Paenibacillus jamilae, Paenibacillus polymyxa, Paenibacillus azotofixans and Paenibacillus peoriae. The level of 16S rDNA similarity between strains AM49^T and AM141^T was 97·6 %, and 16S rDNA similarity values between strains AM49^T and AM141^T and the type strains of other Paenibacillus spp. ranged from 90·3 to 98·7 %. Levels of DNA–DNA similarity between the two strains and members of the genus Paenibacillus indicated that strains AM49^T and AM141^T were distinguishable from each other and from four phylogenetically related Paenibacillus spp. Therefore, on the basis of their phenotypic properties, phylogeny and genomic distinctiveness, it is proposed that strains AM49^T and AM141^T be placed in the genus Paenibacillus as two distinct novel species, Paenibacillus kribbensis (AM49^T =KCTC 0766BP^T =JCM 11465^T) and Paenibacillus terrae (AM141^T =KCCM 41557^T =JCM 11466^T).

The phylogenetic tree from which Fig. 2 was taken is available as supplementary data in IJSEM Online (http://ijs.sgmjournals.org).

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