4YWS

Thermostable enolase from Chloroflexus aurantiacus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

Starting Model: experimental
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Literature

Biochemical and Structural Characterization of Enolase from Chloroflexus aurantiacus: Evidence for a Thermophilic Origin.

Zadvornyy, O.A.Boyd, E.S.Posewitz, M.C.Zorin, N.A.Peters, J.W.

(2015) Front Bioeng Biotechnol 3: 74-74

  • DOI: https://doi.org/10.3389/fbioe.2015.00074
  • Primary Citation of Related Structures:  
    4YWS, 4Z17, 4Z1Y

  • PubMed Abstract: 

    Enolase catalyzes the conversion of 2-phosphoglycerate to phosphoenolpyruvate during both glycolysis and gluconeogenesis, and is required by all three domains of life. Here, we report the purification and biochemical and structural characterization of enolase from Chloroflexus aurantiacus, a thermophilic anoxygenic phototroph affiliated with the green non-sulfur bacteria. The protein was purified as a homodimer with a subunit molecular weight of 46 kDa. The temperature optimum for enolase catalysis was 80°C, close to the measured thermal stability of the protein which was determined to be 75°C, while the pH optimum for enzyme activity was 6.5. The specific activities of purified enolase determined at 25 and 80°C were 147 and 300 U mg(-1) of protein, respectively. K m values for the 2-phosphoglycerate/phosphoenolpyruvate reaction determined at 25 and 80°C were 0.16 and 0.03 mM, respectively. The K m values for Mg(2+) binding at these temperatures were 2.5 and 1.9 mM, respectively. When compared to enolase from mesophiles, the biochemical and structural properties of enolase from C. aurantiacus are consistent with this being thermally adapted. These data are consistent with the results of our phylogenetic analysis of enolase, which reveal that enolase has a thermophilic origin.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Montana State University , Bozeman, MT , USA ; Institute of Basic Biological Problems, Russian Academy of Sciences , Pushchino , Russia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Enolase
A, B
426Chloroflexus aurantiacus J-10-flMutation(s): 0 
EC: 4.2.1.11
UniProt
Find proteins for A9WCM4 (Chloroflexus aurantiacus (strain ATCC 29366 / DSM 635 / J-10-fl))
Explore A9WCM4 
Go to UniProtKB:  A9WCM4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA9WCM4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 146.319α = 90
b = 146.319β = 90
c = 102.989γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing
MOLREPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
AFOSRUnited StatesFA9550-14-1-0147

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release
  • Version 1.1: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy