7L18

Crystal structure of a tandem deletion mutant of rat NADPH-cytochrome P450 reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.181 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structural and kinetic investigations of the carboxy terminus of NADPH-cytochrome P450 oxidoreductase.

Hubbard, P.A.Xia, C.Shen, A.L.Kim, J.P.

(2021) Arch Biochem Biophys 701: 108792-108792

  • DOI: https://doi.org/10.1016/j.abb.2021.108792
  • Primary Citation of Related Structures:  
    7L18

  • PubMed Abstract: 

    The influence of the side chains and positioning of the carboxy-terminal residues of NADPH-cytochrome P450 oxidoreductase (CYPOR) on catalytic activity, structure of the carboxy terminus, and interaction with cofactors has been investigated. A tandem deletion of residues Asp675 and Val676, that was expected to shift the position of the functionally important Trp677, resulted in higher cytochrome c reductase activity than that expected from previous studies on the importance of Asp675 and Trp677 in catalysis. Crystallographic determination of the structure of this variant revealed two conformations of the carboxy terminus. In one conformation (Mol A), the last α-helix is partially unwound, resulting in repositioning of all subsequent residues in β-strand 21, from Arg671 to Leu674 (corresponding to Ser673 and Val676 in the wild type structure). This results in the two C-terminal residues, Trp677 and Ser678, being maintained in their wild type positions, with the indole ring of Trp677 stacked against the isoalloxazine ring of FAD as seen in the wild type structure, and Ser673 occupying a similar position to the catalytic residue, Asp675. The other, more disordered conformation is a mixture of the Mol A conformation and one in which the last α-helix is not unwound and the nicotinamide ring is in one of two conformations, out towards the protein surface as observed in the wild type structure (1AMO), or stacked against the flavin ring, similar to that seen in the W677X structure that lacks Trp677 and Ser678 (1JA0). Further kinetic analysis on additional variants showed deletion or substitution of alanine or glycine for Trp677 in conjunction with deletion of Ser678 produced alterations in interactions of CYPOR with NADP + , 2'5'-ADP, and 2'-AMP, as well as the pH dependence of cytochrome c reductase activity. We postulate that deletion of bulky residues at the carboxy terminus permits increased mobility leading to decreased affinity for the 2'5'-ADP and 2'-AMP moieties of NADP + and subsequent domain movement.


  • Organizational Affiliation

    Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, 53226, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NADPH--cytochrome P450 reductaseA [auth AAA],
B [auth BBB]
620Rattus norvegicusMutation(s): 0 
Gene Names: Por
EC: 1.6.2.4
UniProt
Find proteins for P00388 (Rattus norvegicus)
Explore P00388 
Go to UniProtKB:  P00388
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00388
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FAD
Query on FAD

Download Ideal Coordinates CCD File 
D [auth AAA],
G [auth BBB]
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
NAP
Query on NAP

Download Ideal Coordinates CCD File 
E [auth AAA],
H [auth BBB]
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
FMN
Query on FMN

Download Ideal Coordinates CCD File 
C [auth AAA],
F [auth BBB]
FLAVIN MONONUCLEOTIDE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.058α = 90
b = 114.821β = 90
c = 120.285γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
REFMACphasing

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 Environmental Health Sciences (NIH/NIEHS)United StatesGM097031

Revision History  (Full details and data files)

  • Version 1.0: 2021-01-13
    Type: Initial release
  • Version 1.1: 2021-07-28
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Database references, Refinement description