XFEL crystal structure of cytochrome c peroxidase compound II

Experimental Data Snapshot

  • Resolution: 1.06 Å
  • R-Value Work: 0.140 

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XFEL Crystal Structures of Peroxidase Compound II.

Kwon, H.Basran, J.Pathak, C.Hussain, M.Freeman, S.L.Fielding, A.J.Bailey, A.J.Stefanou, N.Sparkes, H.A.Tosha, T.Yamashita, K.Hirata, K.Murakami, H.Ueno, G.Ago, H.Tono, K.Yamamoto, M.Sawai, H.Shiro, Y.Sugimoto, H.Raven, E.L.Moody, P.C.E.

(2021) Angew Chem Int Ed Engl 60: 14578-14585

  • DOI: https://doi.org/10.1002/anie.202103010
  • Primary Citation of Related Structures:  
    7BI1, 7BIU

  • PubMed Abstract: 

    Oxygen activation in all heme enzymes requires the formation of high oxidation states of iron, usually referred to as ferryl heme. There are two known intermediates: Compound I and Compound II. The nature of the ferryl heme-and whether it is an Fe IV =O or Fe IV -OH species-is important for controlling reactivity across groups of heme enzymes. The most recent evidence for Compound I indicates that the ferryl heme is an unprotonated Fe IV =O species. For Compound II, the nature of the ferryl heme is not unambiguously established. Here, we report 1.06 Å and 1.50 Å crystal structures for Compound II intermediates in cytochrome c peroxidase (CcP) and ascorbate peroxidase (APX), collected using the X-ray free electron laser at SACLA. The structures reveal differences between the two peroxidases. The iron-oxygen bond length in CcP (1.76 Å) is notably shorter than in APX (1.87 Å). The results indicate that the ferryl species is finely tuned across Compound I and Compound II species in closely related peroxidase enzymes. We propose that this fine-tuning is linked to the functional need for proton delivery to the heme.

  • Organizational Affiliation

    School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome c peroxidase, mitochondrial294Saccharomyces cerevisiaeMutation(s): 0 
Gene Names: SCNYR20_0010026000SCP684_0010026400
Find proteins for P00431 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P00431 
Go to UniProtKB:  P00431
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00431
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEC

Download Ideal Coordinates CCD File 
B [auth A]HEME C
C34 H34 Fe N4 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.06 Å
  • R-Value Work: 0.140 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.81α = 90
b = 75.54β = 90
c = 106.57γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
CrystFELdata reduction
CrystFELdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research Council (BBSRC)United KingdomBB/N015940/1

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-21
    Type: Initial release
  • Version 1.1: 2021-06-30
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Database references, Refinement description