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Novel Trypsin Inhibitors from the White Rot Fungus Abortiporus biennis. Partial Purification and Characterization

J. Zuchowski1*, M. Jaszek2, and K. Grzywnowicz2

1Department of Biochemistry and Crop Quality, Institute of Soil Science and Plant Cultivation, ul. Czartoryskich 8, 24-100 Pulawy, Poland; fax: (4881) 886-4547; E-mail: jzuch@o2.pl

2Department of Biochemistry, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 3, 20-031 Lublin, Poland; fax: (4881) 537-5761; E-mail: mjaszek@biotop.umcs.lublin.pl; grzyw@hermes.umcs.lublin.pl

* To whom correspondence should be addressed.

Received April 4, 2008; Revision received June 25, 2008
Novel trypsin inhibitors from the white rot fungus Abortiporus biennis were isolated, partially purified, and characterized. The inhibitors were purified by heat treatment, anion-exchange chromatography, and gel filtration. SDS-PAGE of the purified preparation demonstrated the presence of two proteins with molecular masses of 20 and 21.5 kDa. The A. biennis inhibitors were most active against trypsin, while chymotrypsin α, proteinase K, and Carlsberg subtilisin were inhibited to a smaller extent. The inhibitors are acidic proteins with remarkably high heat stability.
KEY WORDS: Abortiporus biennis, protease inhibitors; white rot fungi, Basidiomycetes

DOI: 10.1134/S0006297909020151