Isolation, purification and physicochemical properties of glutamin-asparaginase from Pseudomonas boreopolis 526

A new homogeneous enzyme which is capable of catalyzing the hydrolysis of both glutamine and asparaginase has been purified from extracts of Pseudomonas boreopolis 526 by the improved method. Purification involves few stages. The ratio of glutaminase to asparaginase activity is approximately 1.5:1.0. The enzyme is stable on storage and has a wide pH optimum of action (6-8.5). The molecular weight is about 134 000-145 000 D and the subunit molecular weight is about 34 000 D. No free SH-groups have been detected in the enzyme molecule.