Optimized Production and Bioactivity of Oyster Mushroom L-asparaginase

Researchers are exploring Oyster mushroom L-asparaginase as a powerful tool for both clinical oncology and industrial food safety. This specific enzyme deaminates L-asparagine into aspartic acid and ammonia. Consequently, it starves certain cancer cells of an essential nutrient that they cannot synthesize independently. A recent study has successfully optimized the production of this enzyme from Pleurotus ostreatus AUMC 16015 using solid-state fermentation (SSF). By utilizing various agricultural substrates, the team achieved a 2.46-fold increase in enzyme yield compared to earlier methods. This sustainable approach supports a circular bioeconomy by effectively converting agricultural waste into high-value medical bioproducts.

Antitumor and Antioxidant Potential

Specifically, the purified enzyme demonstrated remarkable bioactivities in laboratory assessments. Analytical results showed a molecular weight of approximately 48 kDa with high substrate specificity. Furthermore, the Oyster mushroom L-asparaginase exhibited strong antioxidant activity, which helps neutralize harmful free radicals in the body. In cell line studies, the enzyme showed potent inhibitory effects against Caco-2 colon cancer and MCF-7 breast cancer cells. Notably, it also displayed a robust anti-hemolytic effect, protecting red blood cells from oxidative damage. These findings suggest that the fungal enzyme could eventually serve as a safer alternative to current bacterial-derived treatments.

Impact on Food Safety and Acrylamide Reduction

In addition to its medical potential, the enzyme plays a critical role in enhancing food safety. For instance, treating potato chips with L-asparaginase resulted in a 9.6-fold decrease in acrylamide formation. Acrylamide is a potential carcinogen that forms during high-temperature cooking through the Maillard reaction. By eliminating the precursor asparagine, the enzyme significantly improves the safety profile of processed carbohydrate-rich foods. Therefore, this fungal enzyme represents a dual-purpose bioactive agent with significant commercial and therapeutic value for the future.

Frequently Asked Questions

How does Oyster mushroom L-asparaginase help in cancer treatment?

The enzyme works by breaking down L-asparagine in the bloodstream. Since many cancer cells, such as those in acute lymphoblastic leukemia, cannot produce their own asparagine, they eventually undergo apoptosis due to nutrient deprivation.

Why is reducing acrylamide in food important?

Acrylamide is a toxic byproduct formed when starchy foods are fried or baked at high temperatures. Reducing its levels through enzymatic treatment helps lower the risk of neurotoxicity and potential carcinogenesis in consumers.

Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

Mahmoud YA et al. Pleurotus ostreatus L-asparaginase's use in food safety and biotechnology: from processing assistance to bioactive agent. Microb Cell Fact. 2026 May 04. doi: 10.1186/s12934-026-03007-9. PMID: 42083015.

Mattioli 1885. L-Asparaginase potential in acrylamide mitigation from foodstuff: a mini-review. Progress in Nutrition. 2019;21(3):498-506. doi: 10.23751/pn.v21i3.6771.

Bansal S et al. L-asparaginase: a review of microbial production and protein engineering with translational applications for oncology and food safety. World J Microbiol Biotechnol. 2025;41:10.1007/s11274-025-04614-1.