C-terminal domain of MdPPO1 upon self-cleavage (Ccleaved-domain)

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.172 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


A Peptide-Induced Self-Cleavage Reaction Initiates the Activation of Tyrosinase.

Kampatsikas, I.Bijelic, A.Pretzler, M.Rompel, A.

(2019) Angew Chem Int Ed Engl 58: 7475-7479

  • DOI: https://doi.org/10.1002/anie.201901332
  • Primary Citation of Related Structures:  
    6ELS, 6ELT, 6ELV

  • PubMed Abstract: 

    The conversion of inactive pro-polyphenol oxidases (pro-PPOs) into the active enzyme results from the proteolytic cleavage of its C-terminal domain. Herein, a peptide-mediated cleavage process that activates pro-MdPPO1 (Malus domestica) is reported. Mass spectrometry, mutagenesis studies, and X-ray crystal-structure analysis of pro-MdPPO1 (1.35 Å) and two separated C-terminal domains, one obtained upon self-cleavage of pro-MdPPO1 and the other one produced independently, were applied to study the observed self-cleavage. The sequence Lys 355-Val 370 located in the linker between the active and the C-terminal domain is indispensable for the self-cleavage. Partial introduction (Lys 352-Ala 360) of this peptide into the sequence of two other PPOs, MdPPO2 and aurone synthase (CgAUS1), triggered self-cleavage in the resulting mutants. This is the first experimental proof of a self-cleavage-inducing peptide in PPOs, unveiling a new mode of activation for this enzyme class that is independent of any external protease.

  • Organizational Affiliation

    Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090, Wien, Austria.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Polyphenol oxidase, chloroplastic136Malus domesticaMutation(s): 0 
Find proteins for P43309 (Malus domestica)
Explore P43309 
Go to UniProtKB:  P43309
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43309
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CA

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.201 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.23α = 90
b = 50.14β = 90
c = 50.72γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Austrian Science FundAustriaP25217
Austrian Science FundAustriaP29144

Revision History  (Full details and data files)

  • Version 1.0: 2019-03-20
    Type: Initial release
  • Version 1.1: 2019-04-24
    Changes: Data collection, Database references
  • Version 1.2: 2019-05-29
    Changes: Data collection, Database references
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references, Derived calculations, Refinement description