Crystal structure of Prolyl Endopeptidase from Haliotis discus hannai

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 

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This is version 1.2 of the entry. See complete history


Characterization and crystal structure of prolyl endopeptidase from abalone (Haliotis discus hannai).

Li, W.Y.Li, Y.Chen, Y.L.Hu, J.J.Mengist, H.M.Liu, G.M.Jin, T.Cao, M.J.

(2020) Food Chem 333: 127452-127452

  • DOI: https://doi.org/10.1016/j.foodchem.2020.127452
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Aimed to study the characteristics of prolyl endopeptidase (PEP, EC and its possible role in the degradation of collagen, we cloned the full-length cDNA sequence of PEP from abalone (Haliotis discus hannai) (Hdh-PEP). Recombinant Hdh-PEP (rHdh-PEP) was expressed in vitro, its enzymatic properties were detected, and its secondary structure was analyzed by Circular Dichroism (CD). We for the first time determined the 1.5 Å crystal structure of rHdh-PEP. The decomposition effect of rHdh-PEP on collagen peptides was analyzed. Our data revealed that the molecular weight of rHdh-PEP is 85 kDa, consisting of a catalytic domain and a β-propeller domain. The optimal pH and temperature of rHdh-PEP were pH 6.0 and 20 °C, respectively. Using small collagen peptides as substrates, HPLC-ESI-MS analysis confirmed that rHdh-PEP specifically cleaved at the carboxyl side of proline residues, suggesting its role in the degradation of collagen peptides during autolysis.

  • Organizational Affiliation

    College of Food and Biological Engineering, Jimei University, Xiamen, Fujian 361021, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Prolyl endopeptidase758Haliotis discus hannaiMutation(s): 0 
Gene Names: PREP
Find proteins for A0A1X9T5X9 (Haliotis discus hannai)
Explore A0A1X9T5X9 
Go to UniProtKB:  A0A1X9T5X9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1X9T5X9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.325α = 90
b = 104.955β = 90
c = 137.739γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-04-29
    Type: Initial release
  • Version 1.1: 2020-10-14
    Changes: Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description