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Study on a proteolytic enzyme from Trypanosoma congolense
Authors:Peter Rautenberg  Regina Schädler  Erwin Reinwald  Hans-Jörg Risse
Institution:(1) Institut für Veterinär-Biochemie, Freie Universität Berlin, Koserstr. 20, D-1000 Berlin 33, Germany;(2) Present address: Abteilung Medizinische Mikrobiologie, Klinikum der Christian-Albrechts-Universität Kiel, Brunswiker Stralße 2-6, 2300 Kiel 1, Germany
Abstract:Summary A protease has been purified from Trypanosoma congolense bloodstream forms by osmotic disruption, freeze-thawing of the cells, followed by chromatography using Thiopropyl-Sepharose and gel filtration.The enzyme is a thiolprotease. A combination of SDS-polyacrylamide gel electrophoresis and contact print zymograms using casein as substrate showed a single proteolytic band with a molecular weight of 31 000. The isoelectric point of the enzyme as ascertained by isoelectric focusing extended from pH 4.4 to 5.5 with a maximum at pH 5.0. The protease cleaved various heat denatured substrates such as casein, hemoglobin, albumin and ovalbumin. The highest enzyme activity was observed at pH 5.5 and pH 6.0 using casein and hemoglobin as substrates respectively. The max. temperature was found to be 50 °C. The enzyme is inactivated by mercurial compounds, iodoacetamide, iodoacetate, chloromethylketones and leupeptin and is activated by dithioerythritol.
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