Crystal structure of substrate-free P450cam at 200 mM [K+]

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.198 

Starting Model: other
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P450cam visits an open conformation in the absence of substrate.

Lee, Y.T.Wilson, R.F.Rupniewski, I.Goodin, D.B.

(2010) Biochemistry 49: 3412-3419

  • DOI: https://doi.org/10.1021/bi100183g
  • Primary Citation of Related Structures:  
    3L61, 3L62, 3L63

  • PubMed Abstract: 

    P450cam from Pseudomonas putida is the best characterized member of the vast family of cytochrome P450s, and it has long been believed to have a more rigid and closed active site relative to other P450s. Here we report X-ray structures of P450cam crystallized in the absence of substrate and at high and low [K(+)]. The camphor-free structures are observed in a distinct open conformation characterized by a water-filled channel created by the retraction of the F and G helices, disorder of the B' helix, and loss of the K(+) binding site. Crystallization in the presence of K(+) alone does not alter the open conformation, while crystallization with camphor alone is sufficient for closure of the channel. Soaking crystals of the open conformation in excess camphor does not promote camphor binding or closure, suggesting resistance to conformational change by the crystal lattice. This open conformation is remarkably similar to that seen upon binding large tethered substrates, showing that it is not the result of a perturbation by the ligand. Redissolved crystals of the open conformation are observed as a mixture of P420 and P450 forms, which is converted to the P450 form upon addition of camphor and K(+). These data reveal that P450cam can dynamically visit an open conformation that allows access to the deeply buried active site without being induced by substrate or ligand.

  • Organizational Affiliation

    Department of Molecular Biology, 10550 North Torrey Pines Road, The Scripps Research Institute, La Jolla, California 92037, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Camphor 5-monooxygenase414Pseudomonas putidaMutation(s): 1 
Gene Names: camCcyp101
Find proteins for P00183 (Pseudomonas putida)
Explore P00183 
Go to UniProtKB:  P00183
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00183
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEM

Download Ideal Coordinates CCD File 
C34 H32 Fe N4 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.606α = 90
b = 73.825β = 90
c = 92.428γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-04-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-13
    Changes: Database references, Derived calculations
  • Version 1.3: 2024-02-21
    Changes: Data collection
  • Version 1.4: 2024-04-03
    Changes: Refinement description