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Diet of the crab-eating monkey ( Macaca fascicularis ) consists of both plants and animals, including chitin-containing organisms such as crabs and insects. This omnivorous monkey has a high expression of acidic chitinase (CHIA) in the stomach and here ,  we report on its enzymatic properties under different conditions. When we compared with  Mus musculus  CHIA ( Mm -CHIA),  Macaca fascicularis  CHIA ( Mf -CHIA) exhibits higher chitinolytic activity at broad pH (1.0–7.0) and temperature (30–70 ℃) range. Interestingly, at its optimum pH (5.0),  Mf -CHIA showed the highest activity at 65 °C while maintaining it at robust levels between 50 and 70 °C. The degradation efficiency of  Mf -CHIA was superior to  Mm -CHIA toward both polymeric chitin as well as an artificial chromogenic substrate. Our results show that unique features of  Mf -CHIA including its thermostability warrant the nomination of this enzyme for potential agricultural and biomedical applications.

Robust chitinolytic activity of crab-eating monkey (Macaca fascicularis) acidic chitinase under a broad pH and temperature range