1OC2

The structure of NADH in the dTDP-D-glucose dehydratase (RmlB) enzyme

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.173 

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Literature

The Structure of Nadh in the Enzyme Dtdp-D-Glucose Dehydratase (Rmlb)

Beis, K., Allard, S.T., Hegeman, A.D., Murshudov, G., Philp, D., Naismith, J.H.

(2003) J Am Chem Soc 125: 11872

  • DOI: 10.1021/ja035796r
  • Primary Citation of Related Structures:  
    1OC2

  • PubMed Abstract: 

    • The structure of Streptococcus suis serotype type 2 dTDP-d-glucose 4,6-dehydratase (RmlB) has been determined to 1.5 A resolution with its nicotinamide coenzyme and substrate analogue dTDP-xylose bound in an abortive complex. During enzyme turnover, NAD(+) abstracts a hydride from the C4' atom of dTDP-glucose-forming NADH ...

    The structure of Streptococcus suis serotype type 2 dTDP-d-glucose 4,6-dehydratase (RmlB) has been determined to 1.5 A resolution with its nicotinamide coenzyme and substrate analogue dTDP-xylose bound in an abortive complex. During enzyme turnover, NAD(+) abstracts a hydride from the C4' atom of dTDP-glucose-forming NADH. After elimination of water, hydride is then transferred back to the C6' atom of dTDP-4-keto-5,6-glucosene-regenerating NAD(+). Single-crystal spectroscopic studies unambiguously show that the coenzyme has been trapped as NADH in the crystal. Electron density clearly demonstrates that in contrast to native structures of RmlB where a flat nicotinamide ring is observed, the dihydropyridine ring of the reduced cofactor in this complex is found as a boat. The si face, from which the pro-S hydride is transferred, has a concave surface. Ab initio electronic structure calculations demonstrate that the presence of an internal hydrogen bond, between the amide NH on the nicotinamide ring and one of the oxygen atoms on a phosphate group, stabilizes this distorted conformation. Additionally, calculations show that the hydride donor ability of NADH is influenced by the degree of bending in the ring and may be influenced by an active-site tyrosine residue (Tyr 161). These results demonstrate the ability of dehydratase enzymes to fine-tune the redox potential of NADH through conformational changes in the nicotinamide ring.

    Organizational Affiliation: 

    Centre for Biomolecular Sciences, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DTDP-GLUCOSE 4,6-DEHYDRATASEA, B348Streptococcus suisMutation(s): 0 
Gene Names: 
EC: 4.2.1.46
UniProt
Find proteins for Q8GIP9 (Streptococcus suis)
Explore Q8GIP9 
Go to UniProtKB:  Q8GIP9
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.41α = 90
b = 94.829β = 90
c = 183.543γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALEPACKdata scaling
AMoREphasing

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-10-02
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Source and taxonomy