8XTC image
Entry Detail
PDB ID:
8XTC
Keywords:
Title:
Crystal structure of a novel PU plastic degradation urethanase UMG-SP2 mutant from uncultured bacterium in complex with ligand
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2024-01-10
Release Date:
2025-01-15
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:umgsp2-mut
Chain IDs:A, B
Chain Length:454
Number of Molecules:2
Biological Source:metagenome
Primary Citation
Structure-Guided Engineering of a Versatile Urethanase Improves Its Polyurethane Depolymerization Activity.
Adv Sci 12 e2416019 e2416019 (2025)
PMID: 39921299 DOI: 10.1002/advs.202416019

Abstact

Polyurethane (PUR), the fifth most prevalent synthetic polymer, substantially contributes to the global plastic waste problem. Biotechnology-based recycling methods have recently emerged as innovative solutions to plastic waste disposal and sparked interest among scientific communities and industrial stakeholders in discovering and designing highly active plastic-degrading enzymes. Here, the ligand-free crystal structure of UMG-SP2, a metagenome-derived urethanase with depolymerization activities, at 2.59 Å resolution, as well as its (co-)structures bound to a suicide hydrolase inhibitor and a short-chain carbamate substrate at 2.16 and 2.40 Å resolutions, respectively, is reported. Structural analysis and molecular dynamics simulations reveal that the flexible loop L3 consisting of residues 219-226 is crucial for regulating the hydrolytic activity of UMG-SP2. The semi-rational redesign of UMG-SP2 reveals superior variants, A141G and Q399A, exhibiting over 30.7- and 7.4-fold increased activities on polyester-PUR and a methylene diamine derivative of PUR, respectively, compared to the wild-type enzyme. These findings advance the understanding of the structure-function relationship of PUR-hydrolyzing enzymes, which hold great promise for developing effective industrial PUR recycling processes and mitigating the environmental footprint of plastic waste.

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