5CIH

Complex of yeast cytochrome c peroxidase (W191Y) with iso-1 cytochrome c


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.229 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Constraints on the Radical Cation Center of Cytochrome c Peroxidase for Electron Transfer from Cytochrome c.

Payne, T.M.Yee, E.F.Dzikovski, B.Crane, B.R.

(2016) Biochemistry 55: 4807-4822

  • DOI: https://doi.org/10.1021/acs.biochem.6b00262
  • Primary Citation of Related Structures:  
    5CIB, 5CIC, 5CID, 5CIE, 5CIF, 5CIG, 5CIH

  • PubMed Abstract: 

    The tryptophan 191 cation radical of cytochrome c peroxidase (CcP) compound I (Cpd I) mediates long-range electron transfer (ET) to cytochrome c (Cc). Here we test the effects of chemical substitution at position 191. CcP W191Y forms a stable tyrosyl radical upon reaction with peroxide and produces spectral properties similar to those of Cpd I but has low reactivity toward reduced Cc. CcP W191G and W191F variants also have low activity, as do redox ligands that bind within the W191G cavity. Crystal structures of complexes between Cc and CcP W191X (X = Y, F, or G), as well as W191G with four bound ligands reveal similar 1:1 association modes and heme pocket conformations. The ligands display structural disorder in the pocket and do not hydrogen bond to Asp235, as does Trp191. Well-ordered Tyr191 directs its hydroxyl group toward the porphyrin ring, with no basic residue in the range of interaction. CcP W191X (X = Y, F, or G) variants substituted with zinc-porphyrin (ZnP) undergo photoinduced ET with Cc(III). Their slow charge recombination kinetics that result from loss of the radical center allow resolution of difference spectra for the charge-separated state [ZnP(+), Cc(II)]. The change from a phenyl moiety at position 191 in W191F to a water-filled cavity in W191G produces effects on ET rates much weaker than the effects of the change from Trp to Phe. Low net reactivity of W191Y toward Cc(II) derives either from the inability of ZnP(+) or the Fe-CcP ferryl to oxidize Tyr or from the low potential of the resulting neutral Tyr radical.


  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14853, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome c peroxidase, mitochondrial
A, C
294Saccharomyces cerevisiae S288CMutation(s): 3 
Gene Names: CCP1CCPCPOYKR066C
EC: 1.11.1.5
UniProt
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
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome c iso-1
B, D
103Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: CYC1YJR048WJ1653
UniProt
Find proteins for P00044 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P00044 
Go to UniProtKB:  P00044
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00044
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.229 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.451α = 90
b = 114.219β = 104.32
c = 88.258γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2016-09-07
    Changes: Database references
  • Version 1.2: 2016-09-14
    Changes: Database references
  • Version 1.3: 2017-07-19
    Changes: Database references, Derived calculations, Structure summary
  • Version 2.0: 2021-03-10
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary