Occurrence of neuraminidase and acylneuraminate pyruvate lyase in a strain of vibrio falling into Heiberg's group II isolated from a patient with diarrhea.

The enzymes neuraminidase (EC 3.2.1.18) and acylneuraminate pyruvate lyase (EC 4.1.3.3) were found in a strain of vibrio falling into Heiberg's group II isolated from a patient with diarrhea. The neuraminidase of this strain resembles the neuraminidase of Vibrio cholerae. The pH-optimum, activation by Ca-ions and heat inactivation were studied. There is also some indication of an immunologically common antigenicity. The occurrence of this neuraminidase in the Heiberg's group II vibrio stain is discussed especially with reference to the relationship with the well known enzyme of Vibrio cholerae.