Accumulation of environmental chitin in the lungs can lead to pulmonary fibrosis, characterized by inflammatory infiltration and fibrosis in acidic chitinase (Chia)-deficient mice. Transgenic expression of Chia in these mice ameliorated the symptoms, indicating the potential of enzyme supplementation as a promising therapeutic strategy for related lung diseases. This study focuses on utilizing hyperactivated human Chia, which exhibits low activity. We achieved significant activation of human Chia by incorporating nine amino acids derived from the crab-eating monkey (Macaca fascicularis) Chia, known for its robust chitin-degrading activity. The modified human Chia retained high activity across a broad pH spectrum and exhibited enhanced thermal stability. The amino acid substitutions associated with hyperactivation of human Chia activity occurred species specifically in monkey Chia. This discovery highlights the potential of hyperactivated Chia in treating pulmonary diseases resulting from chitin accumulation in human lungs.

• Klíčová slova
• acidic chitinase (Chia), amino acid substitutions, chitin, enzyme engineering, evolution, exon swapping, hyperactivation, primate lineage, treating pulmonary diseases,
• MeSH
• chitin metabolismus   MeSH
• chitinasy * genetika   metabolismus   chemie   MeSH
• koncentrace vodíkových iontů MeSH
• lidé MeSH
• myši MeSH
• stabilita enzymů MeSH
• substituce aminokyselin MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• CHIA protein, human MeSH Prohlížeč
• chitin MeSH
• chitinasy * MeSH