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Streptococcal nicotinamide adenine dinucleotide glycohydrolase (NADase) with a molecular weight of about 55,000 and an isoelectric pH of 8.55 was isolated from crude streptolysin O (SLO) preparations. NADase differed from SLO in size, charge, and immunological behavior. Streptococcal NADase is considered to have no role in the hemolytic process because it has no hemolytic activity; conversely, partially purified SLO showed no NADase activity. The hemolytic activity of crude SLO was completely inhibited by anti-tetanolysin, whereas the NADase activity in the same reaction mixture was unaffected. Experiments involving double diffusion in agar also demonstrated immunological nonidentity of the two proteins.

Physical Separation of Streptococcal Nicotinamide Adenine Dinucleotide Glycohydrolase from Streptolysin O