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Transfer of Peptococcus indolicus, Peptococcus asaccharolyticus, Peptococcus prevotii, and Peptococcus magnus to the Genus Peptostreptococcus and Proposal of Peptostreptococcus tetradius sp. nov.

¹ Department of Microbiology, Gifu University School of Medicine, 40 Tsukasa-machi, Gifu, 500, Japan
² Obstetrics and Gynecology Department, Tajimi Municipal Hospital, Maehata-cho, Tajimi, 507, Japan
³ International Academy of Paramedical Technology, Nagamine 795, Ichi-hiraga, Seki, 506, Japan

ABSTRACT

The guanine-plus-cytosine (G+C) contents of the deoxyribonucleic acids (DNAs) of Peptococcus asaccharolyticus ATCC 14963^T (T = type strain), Peptococcus indolicus ATCC 29427^T, Peptococcus prevotii ATCC 9321^T, and Peptococcus magnus ATCC 15794^T ranged from 29 to 34 mol%, whereas the G+C content of the DNA of Peptococcus niger ATCC 27731^T, the type species of the genus Peptococcus, is 51 mol%. The G+C content of the DNA of Peptostreptococcus anaerobius ATCC 27337^T, the type species of the genus Peptostreptococcus, was 33 mol%. Thus, the DNA base compositions of Peptococcus asaccharolyticus, Peptococcus indolicus, Peptococcus prevotii, and Peptococcus magnus resemble the DNA base composition of the type species of the genus Peptostreptococcus rather than the DNA base composition of the type species of the genus Peptococcus. It is not desirable for the genus Peptococcus to include any species whose G+C content is far from the G+C content of the type species of the genus. The levels of DNA-DNA homology between Peptostreptococcus anaerobius ATCC 27337^T and the four species of Peptococcus with low G+C DNA contents ranged from 23 to 36%. The cellular fatty acid profiles of Peptococcus asaccharolyticus, Peptococcus indolicus, Peptococcus prevotii, and Peptococcus magnus also resembled the cellular fatty acid profile of the type species of Peptostreptococcus. Other biochemical characteristics of these species revealed their close resemblance to Peptostreptococcus anaerobius. For these reasons we propose transfer of the four Peptococcus species that have low G+C contents to the genus Peptostreptococcus as Peptostreptococcus asaccharolyticus (Distaso 1912) comb. nov., Peptostreptococcus indolicus (Christiansen 1934) comb. nov., Peptostreptococcus prevotii (Foubert and Douglas 1948) comb. nov., and Peptostreptococcus mangus (Prévot 1933) Smith 1957 comb. rev. A group of organisms previously referred to as "Gaffkya anaerobia" (Choukévitch) Prévot is an identifiable Peptostreptococcus species based on phenotypic and genotypic characteristics. The name of Peptostreptococcus tetradius sp. nov. is proposed for this group of organisms. Strain GIFU 7672 (= ATCC 35098) is designated the type strain. Clinical strains of P. asaccharolyticus that were identified by conventional methods were divided into two homology groups and one unclassified group (A-1). DNA-DNA homology between the type strain of P. prevotii and clinical strains which had been received as P. prevotii ranged from O to 73%.

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