Biodegradation of polyester polyurethane by endophytic fungi

Area of Science:

• Microbiology
• Environmental Science
• Biotechnology

Background:

• Bioremediation utilizes microbial metabolic diversity for pollutant breakdown.
• Plastic pollution, particularly polyester polyurethane (PUR), poses a significant environmental challenge.
• Endophytic fungi represent an underexplored source of novel biodegradation capabilities.

Purpose of the Study:

• To screen endophytic fungi for their ability to degrade polyester polyurethane (PUR).
• To identify specific fungal species or genera with robust PUR-degrading activity.
• To investigate the potential of these fungi for bioremediation applications.

Main Methods:

• Screening of several dozen endophytic fungi for PUR degradation in solid and liquid media.
• Isolation and identification of active fungal strains, focusing on the genus Pestalotiopsis.
• Cultivation experiments to assess PUR degradation and growth on PUR as a sole carbon source under aerobic and anaerobic conditions.
• Preliminary molecular characterization to identify potential enzymes involved in degradation.

Main Results:

• Several endophytic fungal isolates demonstrated efficient degradation of PUR.
• Isolates of the genus Pestalotiopsis exhibited particularly strong PUR-degrading activity.
• Two Pestalotiopsis microspora isolates uniquely grew using PUR as the sole carbon source, under both aerobic and anaerobic conditions.
• Evidence suggests a serine hydrolase is involved in PUR degradation.

Conclusions:

• Endophytic fungi possess significant metabolic potential for degrading synthetic polymers like PUR.
• Pestalotiopsis species, especially P. microspora, are promising candidates for developing bioremediation strategies for PUR waste.
• The ability of some endophytes to utilize PUR anaerobically highlights their potential for diverse environmental applications.
• Further research into the enzymatic mechanisms of PUR degradation by endophytes is warranted.