6T1U

Cytochrome P450 reductase from Candida tropicalis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Biochemical and structural insights into the cytochrome P450 reductase from Candida tropicalis.

Ebrecht, A.C.van der Bergh, N.Harrison, S.T.L.Smit, M.S.Sewell, B.T.Opperman, D.J.

(2019) Sci Rep 9: 20088-20088

  • DOI: https://doi.org/10.1038/s41598-019-56516-6
  • Primary Citation of Related Structures:  
    6T1T, 6T1U

  • PubMed Abstract: 

    Cytochrome P450 reductases (CPRs) are diflavin oxidoreductases that supply electrons to type II cytochrome P450 monooxygenases (CYPs). In addition, it can also reduce other proteins and molecules, including cytochrome c, ferricyanide, and different drugs. Although various CPRs have been functionally and structurally characterized, the overall mechanism and its interaction with different redox acceptors remain elusive. One of the main problems regarding electron transfer between CPRs and CYPs is the so-called "uncoupling", whereby NAD(P)H derived electrons are lost due to the reduced intermediates' (FAD and FMN of CPR) interaction with molecular oxygen. Additionally, the decay of the iron-oxygen complex of the CYP can also contribute to loss of reducing equivalents during an unproductive reaction cycle. This phenomenon generates reactive oxygen species (ROS), leading to an inefficient reaction. Here, we present the study of the CPR from Candida tropicalis (CtCPR) lacking the hydrophobic N-terminal part (Δ2-22). The enzyme supports the reduction of cytochrome c and ferricyanide, with an estimated 30% uncoupling during the reactions with cytochrome c. The ROS produced was not influenced by different physicochemical conditions (ionic strength, pH, temperature). The X-ray structures of the enzyme were solved with and without its cofactor, NADPH. Both CtCPR structures exhibited the closed conformation. Comparison with the different solved structures revealed an intricate ionic network responsible for the regulation of the open/closed movement of CtCPR.


  • Organizational Affiliation

    Department of Microbial, Biochemical, and Food Biotechnology, University of the Free State, Bloemfontein, 9301, South Africa.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NADPH--cytochrome P450 reductase
A, B
679Candida tropicalisMutation(s): 0 
Gene Names: CPR-bNCP1
EC: 1.6.2.4
UniProt
Find proteins for Q5PXH3 (Candida tropicalis)
Explore Q5PXH3 
Go to UniProtKB:  Q5PXH3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5PXH3
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.174 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.289α = 90
b = 67.184β = 91.5
c = 143.466γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Global Challenges Research FundUnited KingdomST/R002754/1

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-08
    Type: Initial release
  • Version 1.1: 2024-01-24
    Changes: Data collection, Database references, Refinement description