1B1C

CRYSTAL STRUCTURE OF THE FMN-BINDING DOMAIN OF HUMAN CYTOCHROME P450 REDUCTASE AT 1.93A RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of the FMN-binding domain of human cytochrome P450 reductase at 1.93 A resolution.

Zhao, Q.Modi, S.Smith, G.Paine, M.McDonagh, P.D.Wolf, C.R.Tew, D.Lian, L.Y.Roberts, G.C.Driessen, H.P.

(1999) Protein Sci. 8: 298-306

  • DOI: 10.1110/ps.8.2.298

  • PubMed Abstract: 
  • The crystal structure of the FMN-binding domain of human NADPH-cytochrome P450 reductase (P450R-FMN), a key component in the cytochrome P450 monooxygenase system, has been determined to 1.93 A resolution and shown to be very similar both to the globa ...

    The crystal structure of the FMN-binding domain of human NADPH-cytochrome P450 reductase (P450R-FMN), a key component in the cytochrome P450 monooxygenase system, has been determined to 1.93 A resolution and shown to be very similar both to the global fold in solution (Barsukov I et al., 1997, J Biomol NMR 10:63-75) and to the corresponding domain in the 2.6 A crystal structure of intact rat P450R (Wang M et al., 1997, Proc Nat Acad Sci USA 94:8411-8416). The crystal structure of P450R-FMN reported here confirms the overall similarity of its alpha-beta-alpha architecture to that of the bacterial flavodoxins, but reveals differences in the position, number, and length of the helices relative to the central beta-sheet. The marked similarity between P450R-FMN and flavodoxins in the interactions between the FMN and the protein, indicate a striking evolutionary conservation of the FMN binding site. The P450R-FMN molecule has an unusual surface charge distribution, leading to a very strong dipole, which may be involved in docking cytochrome P450 into place for electron transfer near the FMN. Several acidic residues near the FMN are identified by mutagenesis experiments to be important for electron transfer to P4502D6 and to cytochrome c, a clear indication of the part of the molecular surface that is likely to be involved in substrate binding. Somewhat different parts are found to be involved in binding cytochrome P450 and cytochrome c.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Diffraction Studies of Human Cytochrome P450 Reductase
      Zhao, Q.,Smith, G.,Modi, S.,Paine, M.,Wolf, R.C.,Tew, D.,Lian, L.Y.,Primrose, W.U.,Roberts, G.C.,Driessen, H.P.
      (1996) J.Struct.Biol. 116: 320


    Organizational Affiliation

    ICRF Unit of Structural Molecular Biology, Department of Crystallography, Birkbeck College, London, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (NADPH-CYTOCHROME P450 REDUCTASE)
A
181Homo sapiensMutation(s): 0 
Gene Names: POR (CYPOR)
EC: 1.6.2.4
Find proteins for P16435 (Homo sapiens)
Go to Gene View: POR
Go to UniProtKB:  P16435
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMN
Query on FMN

Download SDF File 
Download CCD File 
A
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.310α = 90.00
b = 51.440β = 105.93
c = 47.600γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
ROTAVATAdata scaling
CCP4data scaling
RSPSmodel building
VECREFphasing
VECREFmodel building
DENZOdata reduction
TRUNCATEdata scaling
RSPSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-11-24
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description