1887

Abstract

A Gram-positive-staining, aerobic, endospore-forming bacterium (Ca7) was isolated from a bioreactor showing extensive phosphorus removal. Based on 16S rRNA gene sequence similarity comparisons, strain Ca7 was grouped in the genus , most closely related to JSM 082006 (100 %), V2-BIII-A2 (99.2 %) and Con a/3 (97.7 %). Moderate 16S rRNA gene sequence similarities were found to the type strains of the species and (96.4 %), (95.1 %) and (96.1 %). All these species were grouped into a monophyletic cluster and showed very low sequence similarities (<94 %) to the type species of the genus , . The quinone system of strain Ca7 consists predominantly of menaquinone MK-7. The polar lipid profile exhibited the major compounds diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine. In addition, minor compounds of an unidentified phospholipid and an aminophospholipid were detected. No glycolipids were found in strain Ca7, which was consistent with the lipid profiles of , , , , , and , but in contrast to . The diagnostic diamino acid of the peptidoglycan was -diaminopimelic acid and the polyamine pattern contained predominantly spermidine and spermine. The major fatty acids, which were iso-C, anteiso-C and C, supported the grouping of strain Ca7 in the family . The strain showed DNA–DNA similarities of 48 % (reciprocal 47 %) to DSM 23009, 31 % (reciprocal 36 %) to V2-BIII-A2 and 29 % (reciprocal 39 %) to DSM 15822, respectively. These results clearly demonstrate that strain Ca7 is a representative of a novel species, which can be differentiated from its closest relatives by physiological and biochemical tests. Because of the low sequence similarity of strain Ca7 to , which was shared by , , , , , and , and their unique lipid patterns, we propose that strain Ca7 represents a novel species in a novel genus for which the name gen. nov., sp. nov. is proposed. The type strain is Ca7 ( = CCM 8426 = LMG 27063). In addition we propose the reclassification of , , , , , and as comb. nov., comb. nov., comb. nov comb. nov., comb. nov., comb. nov. and comb. nov., respectively [type strains JSM 082006 ( = DSM 23009 = KCTC 13712), V2-BIII-A2 ( = CCM 4982 = DSM 14730), Con a/3 ( = MTCC 4380 = DSM 15822 = JCM 12167), WPCB074 ( = KCTC 13278 = JCM 16348), ZFHKF-1 ( = JCM 13285 = DSM 17262), YC1 ( = KCTC 13181 = CGMCC 1.6854) and LMG 21881 ( = DSM 15866), respectively].

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2013-08-01
2021-10-26
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