Crystal structure of a PET hydrolase from Cryptosporangium aurantiacum

Experimental Data Snapshot

  • Resolution: 1.34 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

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Discovery and rational engineering of PET hydrolase with both mesophilic and thermophilic PET hydrolase properties.

Hong, H.Ki, D.Seo, H.Park, J.Jang, J.Kim, K.J.

(2023) Nat Commun 14: 4556-4556

  • DOI: https://doi.org/10.1038/s41467-023-40233-w
  • Primary Citation of Related Structures:  
    7YM9, 7YME

  • PubMed Abstract: 

    Excessive polyethylene terephthalate (PET) waste causes a variety of problems. Extensive research focused on the development of superior PET hydrolases for PET biorecycling has been conducted. However, template enzymes employed in enzyme engineering mainly focused on IsPETase and leaf-branch compost cutinase, which exhibit mesophilic and thermophilic hydrolytic properties, respectively. Herein, we report a PET hydrolase from Cryptosporangium aurantiacum (CaPETase) that exhibits high thermostability and remarkable PET degradation activity at ambient temperatures. We uncover the crystal structure of CaPETase, which displays a distinct backbone conformation at the active site and residues forming the substrate binding cleft, compared with other PET hydrolases. We further develop a CaPETase M9 variant that exhibits robust thermostability with a T m of 83.2 °C and 41.7-fold enhanced PET hydrolytic activity at 60 °C compared with CaPETase WT . CaPETase M9 almost completely decompose both transparent and colored post-consumer PET powder at 55 °C within half a day in a pH-stat bioreactor.

  • Organizational Affiliation

    School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, KNU Institute for Microorganisms, Kyungpook National University, Daegu, 41566, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Poly(ethylene terephthalate) hydrolase
A, B
268Cryptosporangium aurantiacumMutation(s): 0 
Gene Names: SAMN05443668_101498
Find proteins for A0A1M7II12 (Cryptosporangium aurantiacum)
Explore A0A1M7II12 
Go to UniProtKB:  A0A1M7II12
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1M7II12
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.34 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.309α = 90
b = 82.449β = 90
c = 87.391γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2023-07-12
    Type: Initial release
  • Version 1.1: 2023-08-16
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-29
    Changes: Refinement description