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Nucleic Acid Hybridization Studies and Deoxyribonucleic Acid Base Compositions of Anaerobic, Gram-Positive Cocci

¹ Institut für Botanik und Pharmazeutische Biologie, Universität Erlangen, D-8520 Erlangen, Federal Republic of Germany
² Lehrstuhl für Mikrobiologie, Technische Univesität München, D-8000 München 2, Federal Republic of Germany

^* Corresponding author.

ABSTRACT

Deoxyribonucleic acid-deoxyribonucleic acid reassociation and deoxyribonucleic acid-ribosomal ribonucleic acid cistron similarity studies showed that the anaerobic, gram-positive cocci comprise a rather heterogeneous group of bacteria. The deoxyribonucleic acid-ribosomal ribonucleic acid hybridization studies distinguished seven groups. Groups 1 and 2 consisted of Peptostreptococcus magnus and Peptostreptococcus prevotii, respectively. Peptostreptococcus asaccharolyticus ATCC 14963^T (T = type strain) and Peptostreptococcus indolicus ATCC 29427^T formed a third group, and Peptostreptococcus asaccharolyticus DSM 20364 together with Hare group VIII strain NCTC 9820 formed group 4. Peptostreptococcus anaerobius DSM 20357 was more closely related to Eubacterium tenue ATCC 25553^T and Clostridium lituseburense ATCC 25759^T than to any of the other species studied. Peptostreptococcus micros strains DSM 20468^T and DSM 20367 together with strains belonging to Hare group IX formed group 6, and group 7 consisted of Peptostreptococcus parvulus DSM 20469^T. Strains of different Hare groups were all assigned to one of the seven groups or to the genus Staphylococcus (Hare group VIIb strain NCTC 9819) or the genus Streptococcus (Hare group VIa strain NCTC 9806). The anaerobic cocci also have a diversity of murein structures. This is the first report showing that strains belonging to the same species have different murein types.