4FC6

Studies on DCR shed new light on peroxisomal beta-oxidation: Crystal structure of the ternary complex of pDCR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.159 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Studies of human 2,4-dienoyl CoA reductase shed new light on peroxisomal beta-oxidation of unsaturated fatty acids

Hua, T.Wu, D.Ding, W.Wang, J.Shaw, N.Liu, Z.J.

(2012) J Biol Chem 287: 28956-28965

  • DOI: 10.1074/jbc.M112.385351
  • Primary Citation of Related Structures:  
    4FC6, 4FC7

  • PubMed Abstract: 
  • Peroxisomes play an essential role in maintaining fatty acid homeostasis. Although mitochondria are also known to participate in the catabolism of fatty acids via β-oxidation, differences exist between the peroxisomal and mitochondrial β-oxidation. Only peroxisomes, but not mitochondrion, can shorten very long chain fatty acids ...

    Peroxisomes play an essential role in maintaining fatty acid homeostasis. Although mitochondria are also known to participate in the catabolism of fatty acids via β-oxidation, differences exist between the peroxisomal and mitochondrial β-oxidation. Only peroxisomes, but not mitochondrion, can shorten very long chain fatty acids. Here, we describe the crystal structure of a ternary complex of peroxisomal 2,4-dienoyl CoA reductases (pDCR) with hexadienoyl CoA and NADP, as a prototype for comparison with the mitochondrial 2,4-dienoyl CoA reductase (mDCR) to shed light on the differences between the enzymes from the two organelles at the molecular level. Unexpectedly, the structure of pDCR refined to 1.84 Å resolution reveals the absence of the tyrosine-serine pair seen in the active site of mDCR, which together with a lysine and an asparagine have been deemed a hallmark of the SDR family of enzymes. Instead, aspartate hydrogen-bonded to the Cα hydroxyl via a water molecule seems to perturb the water molecule for protonation of the substrate. Our studies provide the first structural evidence for participation of water in the DCR-catalyzed reactions. Biochemical studies and structural analysis suggest that pDCRs can catalyze the shortening of six-carbon-long substrates in vitro. However, the K(m) values of pDCR for short chain acyl CoAs are at least 6-fold higher than those for substrates with 10 or more aliphatic carbons. Unlike mDCR, hinge movements permit pDCR to process very long chain polyunsaturated fatty acids.


    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Peroxisomal 2,4-dienoyl-CoA reductaseA, B, C, D277Homo sapiensMutation(s): 0 
Gene Names: DECR2PDCRSDR17C1
EC: 1.3.1.34
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NUI1 (Homo sapiens)
Explore Q9NUI1 
Go to UniProtKB:  Q9NUI1
PHAROS:  Q9NUI1
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.038α = 90
b = 95.114β = 90
c = 133.409γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-04
    Type: Initial release
  • Version 1.1: 2012-07-11
    Changes: Database references
  • Version 1.2: 2013-07-24
    Changes: Database references