Characterization of a Human Trypsin Resistant to Kunitz Soybean Trypsin Inhibitor: Studies of Duodenal Juices after Tube Instillation of Raw Soybean Extract

L. I. Thorsen Matforsk, Norwegian Food Research Institute, Aas, and Institute for Nutrition Research, University of Oslo, and Research Institute for Internal Medicine and Medical Dept., Rikshospitalet, Oslo, Norway

H. Holm Matforsk, Norwegian Food Research Institute, Aas, and Institute for Nutrition Research, University of Oslo, and Research Institute for Internal Medicine and Medical Dept., Rikshospitalet, Oslo, Norway

J. E. Reseland Matforsk, Norwegian Food Research Institute, Aas, and Institute for Nutrition Research, University of Oslo, and Research Institute for Internal Medicine and Medical Dept., Rikshospitalet, Oslo, Norway

S. Bjørnsen Matforsk, Norwegian Food Research Institute, Aas, and Institute for Nutrition Research, University of Oslo, and Research Institute for Internal Medicine and Medical Dept., Rikshospitalet, Oslo, Norway

L. E. Hanssen Matforsk, Norwegian Food Research Institute, Aas, and Institute for Nutrition Research, University of Oslo, and Research Institute for Internal Medicine and Medical Dept., Rikshospitalet, Oslo, Norway

F. Brosstad Matforsk, Norwegian Food Research Institute, Aas, and Institute for Nutrition Research, University of Oslo, and Research Institute for Internal Medicine and Medical Dept., Rikshospitalet, Oslo, Norway

Abstract

Human duodenal juices collected during tube instillation of raw soybean extract into the duodenum contained free trypsin and free Kunitz soybean trypsin inhibitor (KTI) in the simultaneous presence of trypsin-KTI complexes. It has previously been suggested that this KTI-non-inhibitable trypsin has a general resistance to serine protease inhibitors. Four different trypsin forms have been found and partly characterized by sodium dodecyl sulphate-polyacrylamide gel electrophoresis and isoelectric focusing followed by Western immunoblotting or enzyme staining. In addition, crossed immunoelectrophoresis and affinity chromatography with antibody-coupled gels have been used for identification of free and inhibitor-complexed trypsin.

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Characterization of a Human Trypsin Resistant to Kunitz Soybean Trypsin Inhibitor: Studies of Duodenal Juices after Tube Instillation of Raw Soybean Extract

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Characterization of a Human Trypsin Resistant to Kunitz Soybean Trypsin Inhibitor: Studies of Duodenal Juices after Tube Instillation of Raw Soybean Extract

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