We determined the taxonomic status of six Bacillus species (Bacillus alginolyticus, Bacillus chondroitinus, Bacillus curdlanolyticus, Bacillus glucanolyticus, Bacillus kobensis, and Bacillus thiuminolyticus) by using the results of 16s rRNA gene sequence and cellular fatty acid composition analyses. Phylogenetic analysis clustered these species closely with the Paenibacillus species. Like the Paenibacillus species, the six Bacillus species contained anteiso-C,,,, fatty acid as a major cellular fatty acid. The use of a specific PCR primer designed for differentiating the genus Paenibacillus from other members of the BaciUaceae showed that the six Bacillus species had the same amplified 16s rRNA gene fragment as members of the genus Paenibacillus. Based on these observations and other taxonomic characteristics, the six Bacillus species were transferred to the genus Paenibacillus. In addition, we propose emendation of the genus Paenibacillus.Rod-shaped, aerobic, endospore-forming bacteria have generally been assigned to the genus Bacillus, a systematically diverse taxon (5). 16s rRNA gene sequence analyses have identified at least 10 phylogenetic groups in the genus Bacillus (2, 3, 7 , 23, 26, 31, 33, 34, 36). (12), that P. pulvifaciens was a subspecies of P. larvae (ll), and that Bacillus lautus and Bacillus peoriae should be transferred to the genus Paenibacillus (13). In addition, Nakamura proposed the new species Paenibacillus apianus (22). Consequently, the genus Paenibacillus consists of 13 species and one subspecies.Members of the genus Paenibacillus are facultatively anaerobic organisms that produce spores in definitely swollen sporangia and have G+C contents ranging from 45 to 54 mol%, and some of these organisms excrete diverse assortments of extracellular polysaccharide-hydrolyzing enzymes (5, 25). Interestingly, many recently described Bacillus species possess the general characteristics of the genus Paenibacillus. The noteworthy ability of these species to hydrolyze complex carbohydrates, including alginate (19), chondroitin (19), chitin (25), curdlan (14), and other polysaccharides (25), suggests that some of them may be related to the genus Paenibacillus. To understand the taxonomic position of these Bacillus species * Corresponding author. Mailing address: Research Laboratory, Higeta Shoyu Co., Ltd., 2-8 Chuo-cho, Choshi, Chiba 288, Japan. Phone: 81-479-22-1180. Fax: 81-479-24-3422. E-mail: LDX05744 @niftyserve.or.jp.
289among the Bacillaceae, we determined the sequences of their 16s rRNA genes and compared these sequences with homologous sequences available for other members of the Bacillaceae. In addition, a highly specific PCR amplification primer was designed on the basis of the 16s rRNA gene sequence alignments for differentiating the genus Paenibacillus from other aerobic, endospore-forming rods.
MATERIALS AND METHODSBacterial strains. The bacterial strains used in this study are listed in Table 1. Working stocks were cultured on tryptic soy agar plates (Difco Laboratories, Detroit, Mich.) fo...