Isolation and characterization of a trypsin-like protease from Trichoderma viride

Area of Science:

• Biochemistry
• Microbiology
• Enzymology

Background:

• Proteases are crucial enzymes with diverse industrial and medical applications.
• Animal-derived proteases, like porcine and bovine trypsin, are widely used but face limitations.
• Exploring microbial sources for novel proteases offers sustainable alternatives.

Purpose of the Study:

• To purify and characterize a serine endopeptidase from Trichoderma viride.
• To evaluate its enzymatic properties and specificity.
• To assess its potential as a substitute for animal trypsin.

Main Methods:

• Purification of the enzyme to electrophoretic homogeneity from Trichoderma viride culture filtrate.
• Determination of molecular mass (25 kDa) and isoelectric point (7.3).
• Analysis of substrate specificity using oxidized insulin B-chain and peptidyl-p-nitroanilide substrates.

Main Results:

• A 25 kDa serine endopeptidase was successfully purified.
• The enzyme cleaved specific sites on oxidized insulin B-chain (Arg22, Lys29).
• Substrate specificity indicated similarity to trypsin, with preference for Lys/Arg at P1.
• Hydrolytic activity on casein was lower than porcine trypsin.
• Amino-terminal sequence showed similarity to bovine trypsin.

Conclusions:

• Trichoderma viride produces a serine endopeptidase with trypsin-like characteristics.
• The enzyme's properties suggest potential for replacing animal trypsin.
• Further research is warranted to explore its applications in the food industry and medicine.