8EUH

cytochrome P450terp (cyp108A1) bound to alpha-terpineol


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Cooperative Substrate Binding Controls Catalysis in Bacterial Cytochrome P450terp (CYP108A1).

Gable, J.A.Poulos, T.L.Follmer, A.H.

(2023) J Am Chem Soc 

  • DOI: https://doi.org/10.1021/jacs.2c12388
  • Primary Citation of Related Structures:  
    8EUH, 8EUK, 8EUL

  • PubMed Abstract: 

    Despite being one of the most well-studied aspects of cytochrome P450 chemistry, important questions remain regarding the nature and ubiquity of allosteric regulation of catalysis. The crystal structure of a bacterial P450, P450terp, in the presence of substrate reveals two binding sites, one above the heme in position for regioselective hydroxylation and another in the substrate access channel. Unlike many bacterial P450s, P450terp does not exhibit an open to closed conformational change when substrate binds; instead, P450terp uses the second substrate molecule to hold the first substrate molecule in position for catalysis. Spectral titrations clearly show that substrate binding to P450terp is cooperative with a Hill coefficient of 1.4 and is supported by isothermal titration calorimetry. The importance of the allosteric site was explored by a series of mutations that weaken the second site and that help hold the first substrate in position for proper catalysis. We further measured the coupling efficiency of both the wild-type (WT) enzyme and the mutant enzymes. While the WT enzyme exhibits 97% efficiency, each of the variants showed lower catalytic efficiency. Additionally, the variants show decreased spin shifts upon binding of substrate. These results are the first clear example of positive homotropic allostery in a class 1 bacterial P450 with its natural substrate. Combined with our recent results from P450cam showing complex substrate allostery and conformational dynamics, our present study with P450terp indicates that bacterial P450s may not be as simple as once thought and share complex substrate binding properties usually associated with only mammalian P450s.


  • Organizational Affiliation

    Departments of Chemistry, University of California, Irvine, Irvine, California 92697-3900, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome P450-terp448Pseudomonas sp.Mutation(s): 0 
Gene Names: cyp108terPC
EC: 1.14
UniProt
Find proteins for P33006 (Pseudomonas sp)
Explore P33006 
Go to UniProtKB:  P33006
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33006
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HEM (Subject of Investigation/LOI)
Query on HEM

Download Ideal Coordinates CCD File 
B [auth A]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
XGE (Subject of Investigation/LOI)
Query on XGE

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
alpha-TERPINEOL
C10 H18 O
WUOACPNHFRMFPN-SECBINFHSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.12α = 90
b = 68.12β = 90
c = 455.406γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM131920

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-22
    Type: Initial release
  • Version 1.1: 2023-10-25
    Changes: Data collection, Refinement description