2H7S

L244A mutant of Cytochrome P450cam


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Cytochrome P450 active site plasticity: attenuation of imidazole binding in cytochrome P450cam by an L244A mutation.

Verras, A.Alian, A.Montellano, P.R.

(2006) Protein Eng.Des.Sel. 19: 491-496

  • DOI: 10.1093/protein/gzl035
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • We have identified a P450(cam) mutation, L244A, that mitigates the affinity for imidazole and substituted imidazoles while maintaining a high affinity for the natural substrate camphor. The P450(cam) L244A crystal structure solved in the absence of a ...

    We have identified a P450(cam) mutation, L244A, that mitigates the affinity for imidazole and substituted imidazoles while maintaining a high affinity for the natural substrate camphor. The P450(cam) L244A crystal structure solved in the absence of any ligand reveals that the I-helix is displaced inwards by over 1 A in response to the cavity created by the change from leucine to alanine. Furthermore, the crystal structures of imidazole-bound P450(cam) and the 1-methylimidazole-bound P450(cam) L244A mutant reveal that the ligands have distinct binding modes in the two proteins. Whereas in wild-type P450(cam) the imidazole coordinates to the iron in an orientation roughly perpendicular to the plane of the heme, in the L244A mutant the rearranged I helix, and specifically residue Val247, forces the imidazole into an orientation almost parallel to the heme that impairs its ability to coordinate to the heme iron. As a result, the imidazole is much more weakly bound to the mutant than it is to the wild-type enzyme. Despite the constriction of the active site by the mutation, previous work with the L244A mutant has shown that it oxidizes larger substrates than the wild-type enzyme. This paradoxical situation, in which a mutation that nominally increases the active site cavity appears to decrease it, suggests that the mutation actually increases the active site maleability, allowing it to better expand to oxidize larger substrates.


    Organizational Affiliation

    Department of Pharmaceutical Chemistry, University of California 600 16th Street, San Francisco, CA 94158-2517, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytochrome P450-cam
A, C
414Pseudomonas putidaMutation(s): 2 
Gene Names: camC (cyp101)
EC: 1.14.15.1
Find proteins for P00183 (Pseudomonas putida)
Go to UniProtKB:  P00183
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, C
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 57.704α = 90.00
b = 59.853β = 104.69
c = 114.124γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CCP4model building
SCALEPACKdata scaling
CNSrefinement
CCP4phasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-10-31
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance