8QRJ

LCC-ICCG PETase mutant H218Y


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.42 Å
  • R-Value Free: 
    0.182 (Depositor), 0.183 (DCC) 
  • R-Value Work: 
    0.167 (Depositor), 0.167 (DCC) 
  • R-Value Observed: 
    0.168 (Depositor) 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Streamlined screening of extracellularly expressed PETase libraries for improved polyethylene terephthalate degradation.

Orr, G.Niv, Y.Barakat, M.Boginya, A.Dessau, M.Afriat-Jurnou, L.

(2024) Biotechnol J 19: e2400021-e2400021

  • DOI: https://doi.org/10.1002/biot.202400021
  • Primary Citation of Related Structures:  
    8QRJ

  • PubMed Abstract: 

    Enzyme-mediated polyethylene terephthalate (PET) depolymerization has recently emerged as a sustainable solution for PET recycling. Towards an industrial-scale implementation of this technology, various strategies are being explored to enhance PET depolymerization (PETase) activity and improve enzyme stability, expression, and purification processes. Recently, rational engineering of a known PET hydrolase (LCC-leaf compost cutinase) has resulted in the isolation of a variant harboring four-point mutations (LCC-ICCG), presenting increased PETase activity and thermal stability. Here, we revealed the enzyme's natural extracellular expression and used it to efficiently screen error-prone genetic libraries based on LCC-ICCG for enhanced activity toward consumer-grade PET. Following multiple rounds of mutagenesis and screening, we successfully isolated variants that exhibited up to a 60% increase in PETase activity. Among other mutations, the improved variants showed a histidine to tyrosine substitution at position 218, a residue known to be involved in substrate binding and stabilization. Introducing H218Y mutation on the background of LCC-ICCG (named here LCC-ICCG/H218Y) resulted in a similar level of activity improvement. Analysis of the solved structure of LCC-ICCG/H218Y compared to other known PETases featuring different amino acids at the equivalent position suggests that H218Y substitution promotes enhanced PETase activity. The expression and screening processes developed in this study can be further used to optimize additional enzymatic parameters crucial for efficient enzymatic degradation of consumer-grade PET.


  • Organizational Affiliation

    Migal-Galilee Research Institute, Kiryat Shmona, Israel.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Leaf-branch compost cutinase293unidentified prokaryotic organismMutation(s): 1 
EC: 3.1.1.101 (UniProt), 3.1.1.74 (UniProt)
UniProt
Find proteins for G9BY57 (Unknown prokaryotic organism)
Explore G9BY57 
Go to UniProtKB:  G9BY57
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG9BY57
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.42 Å
  • R-Value Free:  0.182 (Depositor), 0.183 (DCC) 
  • R-Value Work:  0.167 (Depositor), 0.167 (DCC) 
  • R-Value Observed: 0.168 (Depositor) 
Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.9α = 90
b = 94.51β = 90
c = 80.95γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
XDSdata reduction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Israel Science FoundationIsrael401/18

Revision History  (Full details and data files)

  • Version 1.0: 2024-09-18
    Type: Initial release
  • Version 1.1: 2024-11-20
    Changes: Structure summary