Summary auto-generated
This paper reclassifies members of the genus Peptostreptococcus into three new genera based on 16S rDNA phylogenetic analysis. Previous studies identified that Peptostreptococcus species formed three distinct phylogenetic groups unrelated to the type species P. anaerobius. The authors propose the genus Peptoniphilus gen. nov. for five non-saccharolytic, butyrate-producing species that use peptone and amino acids as energy sources. The genus Anaerococcus gen. nov. contains six saccharolytic, butyrate-producing species, including one newly described species (A. octavius sp. nov.). The genus Gallicola gen. nov. is proposed as a monospecific genus for a single species. Cell wall peptidoglycan structure and biochemical traits clearly differentiate the three groups. These reclassifications resolve the problematic taxonomy of the former Peptostreptococcus genus, which contained species scattered across multiple clostridial groups. The work also notes that the genus Peptostreptococcus itself should be retained only for the type species P. anaerobius.
Key findings
- Three new genera (Peptoniphilus, Anaerococcus, and Gallicola) were proposed to reclassify former Peptostreptococcus species into distinct phylogenetic groups with different biochemical characteristics
- Peptoniphilus comprises five non-saccharolytic, butyrate-producing species dependent on peptone/amino acids for energy, distinguished by ornithine in cell wall peptidoglycan
- Anaerococcus contains six saccharolytic, butyrate-producing species with lysine in peptidoglycan that ferment sugars and include one newly described species
- Cell wall composition (diamino acid type) and metabolic end-products effectively differentiate the three new genera and support their phylogenetic separation
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Abstract
Members of genus Peptostreptococcus have previously been found to be distantly related to the type species, Peptostreptococcus anaerobius, on the basis of 16S rDNA sequence similarities. They were divided into three major phylogenetic groups, and their peptidoglycan structure and biochemical traits differed between groups. The reclassification of the species of these three groups into three new genera, Peptoniphilus gen. nov., Anaerococcus gen. nov. and Gallicola gen. nov., is proposed. The genus Peptoniphilus gen. nov. includes the following butyrate-producing, non-saccharolytic species that use peptone and amino acids as major energy sources: Peptoniphilus asaccharolyticus comb. nov. (type species), Peptoniphilus lacrimaris comb. nov., Peptoniphilus harei comb. nov., Peptoniphilus indolicus comb. nov. and Peptoniphilus ivorii comb. nov. The genus Anaerococcus gen. nov. contains the saccharolytic, butyrate-producing species Anaerococcus prevotii comb. nov. (type species), Anaerococcus tetradius comb. nov., Anaerococcus lactolyticus comb. nov., Anaerococcus hydrogenalis comb. nov., Anaerococcus vaginalis comb. nov. and Anaerococcus octavius sp. nov. The genus Gallicola gen. nov. contains a single species, Gallicola barnesae comb. nov.