Novel sialidase from non-pathogenic bacterium Oerskovia paurometabola strain O129

Bacterial sialidases are enzymes that are involved in a number of vital processes in microorganisms and in their interaction with the host or the environment. Their wide application for scientific and applied purposes requires the search for highly effective and non-pathogenic producers. Here, we report the first description of sialidase from Oerskovia paurometabola. The extracellular enzyme preparation was partially purified. The presence of sialidase was confirmed in native PAGE treated with the fluorogenic substrate 4MU-Neu5Ac. Maximum enzyme activity was registered at 37 °C and in the pH range of 4.0-5.5. The influence of metal ions and EDTA was examined. It was demonstrated that EDTA, Mn²⁺ and Ba²⁺ ions inhibit the sialidase activity to different extent, while Cd²⁺, Fe²⁺ and Fe³⁺ have stimulating effect on it. These features are studied for the first time concerning sialidase of Oerskovia representative. Cell bound sialidase and sialate aldolase were also established.