3HGJ

Old Yellow Enzyme from Thermus scotoductus SA-01 complexed with p-hydroxy-benzaldehyde

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.202 

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This is version 1.2 of the entry. See complete history. 


Literature

Crystal structure of a thermostable old yellow enzyme from Thermus scotoductus SA-01

Opperman, D.J., Sewell, B.T., Litthauer, D., Isupov, M.N., Littlechild, J.A., van Heerden, E.

(2010) Biochem Biophys Res Commun 393: 426-431

  • DOI: 10.1016/j.bbrc.2010.02.011
  • Primary Citation of Related Structures:  
    3HF3, 3HGJ

  • PubMed Abstract: 

    • Recent characterization of the chromate reductase (CrS) from the thermophile Thermus scotoductus SA-01 revealed this enzyme to be related to the Old Yellow Enzyme (OYE) family. Here, we report the structure of a thermostable OYE homolog in its holoform at 2 ...

    Recent characterization of the chromate reductase (CrS) from the thermophile Thermus scotoductus SA-01 revealed this enzyme to be related to the Old Yellow Enzyme (OYE) family. Here, we report the structure of a thermostable OYE homolog in its holoform at 2.2A as well as its complex with p-hydroxybenzaldehyde (pHBA). The enzyme crystallized as octamers with the monomers showing a classical TIM barrel fold which upon dimerization yields the biologically active form of the protein. A sulfate ion is bound above the si-side of the non-covalently bound FMN cofactor in the oxidized solved structure but is displaced upon pHBA binding. The active-site architecture is highly conserved as with other members of this enzyme family. The pHBA in the CrS complex is positioned by hydrogen bonding to the two conserved catalytic-site histidines. The most prominent structural difference between CrS and other OYE homologs is the size of the "capping domain". Thermostabilization of the enzyme is achieved in part through increased proline content within loops and turns as well as increased intersubunit interactions through hydrogen bonding and complex salt bridge networks. CrS is able to reduce the C=C bonds of alpha,beta-unsaturated carbonyl compounds with a preference towards cyclic substrates however no activity was observed towards beta-substituted substrates. Mutational studies have confirmed the role of Tyr177 as the proposed proton donor although reduction could still occur at a reduced rate when this residue was mutated to phenylalanine.

    Organizational Affiliation: 

    Department of Microbial, Biochemical and Food Biotechnology, BioPAD Metagenomics Platform, University of the Free State, Bloemfontein 9300, South Africa.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chromate reductase A, B, C, D349Thermus scotoductusMutation(s): 0 
Gene Names: CrS, chrR
EC: 1.6.99.1
Find proteins for B0JDW3 (Thermus scotoductus)
Explore B0JDW3 
Go to UniProtKB:  B0JDW3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.202 
  • Space Group: P 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.703α = 90
b = 101.169β = 114.32
c = 101.336γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-02-12
    Changes: Database references