The evolution of cutinase Est1 based on the clustering strategy and its application for commercial PET bottles degradation.
J Environ Manage
; 368: 122217, 2024 Sep.
Article
in En
| MEDLINE
| ID: mdl-39146645
ABSTRACT
The rapid increase in global plastic consumption, especially the worldwide use of polyethylene terephthalate (PET), has caused serious pollution problems. Due to the low recycling rate of PET, a substantial amount of waste accumulates in the environment, which prompts a growing focus on enzymatic degradation for its efficiency and environmentally friendliness. This study systematically designed and modified a cutinase, Est1 from Thermobifida alba AHK119, known for its potential of plastic-degradation at high temperatures. Additionally, the introduction of clustering algorithms provided the ability to understand and modify biomolecules, to accelerate the process of finding the optimal mutations. K-means was further proceeded based on the positive mutations. After comprehensive screening for thermostability and activity mutation sites, the dominant mutation Est1_5M (Est1 with the mutations of N213M, T215P, S115P, Q93A, and L91W) exhibited satisfying degradation ability for commercial PET bottles. The results showed that Est1_5M achieved a degradation rate of 90.84% in 72 h, 65-fold higher than the wild type. This study offers reliable theoretical and practical support for the development of efficient PET-degrading enzymes, providing a reference for plastic pollution management.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Carboxylic Ester Hydrolases
/
Polyethylene Terephthalates
Language:
En
Journal:
J Environ Manage
/
J. environ. manag
/
Journal of environmental management
Year:
2024
Document type:
Article
Affiliation country:
China
Country of publication:
United kingdom