Current Knowledge on Polyethylene Terephthalate Degradation by Genetically Modified Microorganisms

Area of Science:

• Biotechnology
• Environmental Science
• Microbiology

Background:

• Global polyethylene terephthalate (PET) production is substantial, leading to significant plastic waste accumulation.
• The recalcitrance of PET to biodegradation by wild-type microorganisms poses environmental challenges.
• Genetically modified microorganisms present a viable strategy for PET degradation and a circular plastic economy.

Purpose of the Study:

• To review current advancements in metabolic and protein engineering for enhanced microbial PET biodegradation.
• To focus on enzyme modifications, particularly for PETase, MHETase, and cutinase, to improve hydrolysis rates.
• To summarize findings on PET hydrolysis based on degradation products.

Main Methods:

• Review of existing literature on microbial and protein engineering for PET degradation.
• Analysis of mutations introduced to hydrolase enzymes (PETase, MHETase, cutinase).
• Examination of studies reporting on the hydrolysis of PET and its degradation products.

Main Results:

• Significant progress has been made in engineering microorganisms for improved PET degradation.
• Specific mutations in PETase, MHETase, and cutinase have demonstrably increased their efficiency.
• Understanding degradation products provides insights into the hydrolysis mechanisms.

Conclusions:

• Metabolic and protein engineering are key to advancing microbial PET biodegradation.
• Enzyme modification strategies show great potential for tackling PET plastic pollution.
• Further research into engineered enzymes will be crucial for a sustainable plastic circular economy.