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The fungal β-N-acetylhexosaminidase from Aspergillus oryzae is composed of propeptide and catalytic domain. The propeptide is noncovalently associated with the catalytic domain of the enzyme. Propeptide is essential for the enzyme activity. While the structure of the catalytic domain was desidned by homology modeling, the structure of the propeptide has not been resolved yet. In this study, the position where the propeptide is associated with the catalytic domain, was uncovered.\nPresented work consists of two parts. First part deals with optimization of production conditions, purification and crystallization of β-N-acetylhexosaminidase from the filamentous fungi Aspergillus oryzae. Second part is devoted to the study of interaction between propeptide and catalytic domain, which was characterized by chemical cross-linking and high-resolution mass spectrometry. It was found that the structural changes of the catalytic domain depend on the presence of the propeptide molecule. 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