title: DNA base sequence homologies among strains of Streptococcus sanguis.
abstract: DNA was isolated from 19 strains and substrains of Streptococcus sanguis and analysed for guanine plus cytosine (GC) contents and base sequence homologies. Three groups could be discerned: group 1 strains had 40-8 to 42-8 mol % GC; group 2, 42-7 to 44-0 mol % GC; group 3, 43-8 to 46-4 mol % GC. DNA homologies between groups 1 and 3 were 40 to 60% at 67 degrees C and 40% at 72 degrees C. The homologies of group 2 towards groups 1 and 3 were much lower. Strains in groups 1 and 3 hydrolysed arginine and aesculin and fermented inulin; group 2 strains did not. Groups 1 and 3 could be considered subspecies of S. sanguis. Group 2 should not be considered S. sanguis.
mesh_terms: D001120:Arginine / Q000378:metabolism; D001483:Base Sequence; D003596:Cytosine / Q000032:analysis; D004269:DNA, Bacterial / Q000032:analysis*; D004929:Esculin / Q000378:metabolism; D006147:Guanine / Q000032:analysis; D007444:Inulin / Q000378:metabolism; D009690:Nucleic Acid Conformation; D013298:Streptococcus sanguis / Q000032:analysis* / Q000145:classification / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D004929:Esculin; D006147:Guanine; D003596:Cytosine; D007444:Inulin; D001120:Arginine