2C91

mouse succinic semialdehyde reductase, AKR7A5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of Mouse Succinic Semialdehyde Reductase Akr7A5: Structural Basis for Substrate Specificity.

Zhu, X.Lapthorn, A.J.Ellis, E.M.

(2006) Biochemistry 45: 1562

  • DOI: 10.1021/bi051610k

  • PubMed Abstract: 
  • The aldo-keto reductases make up a superfamily of enzymes which can reduce a variety of aldehydes and ketones to their corresponding alcohols. Within each family are distinct preferences for certain substrates, presumably reflecting their role within ...

    The aldo-keto reductases make up a superfamily of enzymes which can reduce a variety of aldehydes and ketones to their corresponding alcohols. Within each family are distinct preferences for certain substrates, presumably reflecting their role within the cell. The original member of the AKR7A subfamily was purified from liver as an aflatoxin dialdehyde reductase AKR7A1. However, recent additions to the family have revealed that even closely related enzymes have clear substrate preferences with AKR7A2, AKR7A4, and AKR7A5 showing much higher affinities for succinic semialdehyde (SSA) than does AKR7A1. To investigate the structural basis of this specificity, the crystal structure of mouse AKR7A5 has been determined to better than 2.5 A resolution. The structure is of the ternary complex of the enzyme with NADP+ and tartrate as an inhibitor. This structure has the same overall fold as the previously determined structure of AKR7A1; however, there are a number of differences in loops around the active site that contribute to observed differences in the substrate specificity between the AKR7A enzymes. Several differences are the result of bulky hydrophobic residues found in AKR7A5, namely, Met44, Trp77, and Trp224, which significantly restrict the size and modify the architecture of the substrate-binding pocket, producing a tighter or less flexible binding site for SSA than in AKR7A1. Site-directed mutagenesis was used to introduce Met44, Trp77, and Trp224 individually into AKR7A1, to test if they improved the affinity of the enzyme for SSA. Each mutation showed improved affinity for SSA, with Trp77Met having the largest effect. This confirms the role of these amino acids as substrate determinants for SSA.


    Related Citations: 
    • Characterisation of a Novel Mouse Liver Aldo-Keto Reductase Akr7A5
      Hinshelwood, A.,Mcgarvie, G.,Ellis, E.
      (2002) FEBS Lett. 523: 213


    Organizational Affiliation

    Department of Chemistry, University of Glasgow, Glasgow G12 8QQ, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AFLATOXIN B1 ALDEHYDE REDUCTASE MEMBER 2
A, B, C, D, E, F, G, H, I, J
338Mus musculusMutation(s): 0 
Gene Names: Akr7a2 (Afar, Akr7a5)
EC: 1.1.1.n11
Find proteins for Q8CG76 (Mus musculus)
Go to UniProtKB:  Q8CG76
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, J
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
NAP
Query on NAP

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
2'-MONOPHOSPHOADENOSINE 5'-DIPHOSPHORIBOSE
C21 H28 N7 O17 P3
XJLXINKUBYWONI-NNYOXOHSSA-N
 Ligand Interaction
TLA
Query on TLA

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
L(+)-TARTARIC ACID
C4 H6 O6
FEWJPZIEWOKRBE-JCYAYHJZSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
B, C, D, I, J
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.160 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 98.532α = 90.02
b = 159.238β = 119.40
c = 96.698γ = 78.50
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-02-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance