Crystal Structure of Enoyl-CoA Hydratase from Thermus Thermophilus HB8

Experimental Data Snapshot

  • Resolution: 2.85 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.203 

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This is version 1.5 of the entry. See complete history


Crystal structure of enoyl-CoA hydratase from Thermus thermophilus HB8.

Padavattan, S.Jos, S.Gogoi, H.Bagautdinov, B.

(2021) Acta Crystallogr F Struct Biol Commun 77: 148-155

  • DOI: https://doi.org/10.1107/S2053230X21004593
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Fatty-acid degradation is an oxidative process that involves four enzymatic steps and is referred to as the β-oxidation pathway. During this process, long-chain acyl-CoAs are broken down into acetyl-CoA, which enters the mitochondrial tricarboxylic acid (TCA) cycle, resulting in the production of energy in the form of ATP. Enoyl-CoA hydratase (ECH) catalyzes the second step of the β-oxidation pathway by the syn addition of water to the double bond between C2 and C3 of a 2-trans-enoyl-CoA, resulting in the formation of a 3-hydroxyacyl CoA. Here, the crystal structure of ECH from Thermus thermophilus HB8 (TtECH) is reported at 2.85 Å resolution. TtECH forms a hexamer as a dimer of trimers, and wide clefts are uniquely formed between the two trimers. Although the overall structure of TtECH is similar to that of a hexameric ECH from Rattus norvegicus (RnECH), there is a significant shift in the positions of the helices and loops around the active-site region, which includes the replacement of a longer α3 helix with a shorter α-helix and 3 10 -helix in RnECH. Additionally, one of the catalytic residues of RnECH, Glu144 (numbering based on the RnECH enzyme), is replaced by a glycine in TtECH, while the other catalytic residue Glu164, as well as Ala98 and Gly141 that stabilize the enolate intermediate, is conserved. Their putative ligand-binding sites and active-site residue compositions are dissimilar.

  • Organizational Affiliation

    Department of Biophysics, National Institute of Mental Health and Neurosciences, Bangalore 560 029, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Enoyl-CoA Hydratase253Thermus thermophilusMutation(s): 0 
Find proteins for Q5SKU3 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SKU3 
Go to UniProtKB:  Q5SKU3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5SKU3
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
Experimental Data & Validation

Experimental Data

  • Resolution: 2.85 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.203 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.233α = 90
b = 131.233β = 90
c = 110.608γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-05
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2021-05-19
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Refinement description
  • Version 1.5: 2023-11-15
    Changes: Data collection