3GED

Fingerprint and Structural Analysis of a Apo SCOR enzyme from Clostridium thermocellum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.698 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Sequence fingerprint and structural analysis of the SCOR enzyme A3DFK9 from Clostridium thermocellum.

Huether, R.Liu, Z.J.Xu, H.Wang, B.C.Pletnev, V.Z.Mao, Q.Duax, W.L.Umland, T.C.

(2010) Proteins 78: 603-613

  • DOI: 10.1002/prot.22584
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • We have identified a highly conserved fingerprint of 40 residues in the TGYK subfamily of the short-chain oxidoreductase enzymes. The TGYK subfamily is defined by the presence of an N-terminal TGxxxGxG motif and a catalytic YxxxK motif. This subfamil ...

    We have identified a highly conserved fingerprint of 40 residues in the TGYK subfamily of the short-chain oxidoreductase enzymes. The TGYK subfamily is defined by the presence of an N-terminal TGxxxGxG motif and a catalytic YxxxK motif. This subfamily contains more than 12,000 members, with individual members displaying unique substrate specificities. The 40 fingerprint residues are critical to catalysis, cofactor binding, protein folding, and oligomerization but are substrate independent. Their conservation provides critical insight into evolution of the folding and function of TGYK enzymes. Substrate specificity is determined by distinct combinations of residues in three flexible loops that make up the substrate-binding pocket. Here, we report the structure determinations of the TGYK enzyme A3DFK9 from Clostridium thermocellum in its apo form and with bound NAD(+) cofactor. The function of this protein is unknown, but our analysis of the substrate-binding loops putatively identifies A3DFK9 as a carbohydrate or polyalcohol metabolizing enzyme. C. thermocellum has potential commercial applications because of its ability to convert biomaterial into ethanol. A3DFK9 contains 31 of the 40 TGYK subfamily fingerprint residues. The most significant variations are the substitution of a cysteine (Cys84) for a highly conserved glycine within a characteristic VNNAG motif, and the substitution of a glycine (Gly106) for a highly conserved asparagine residue at a helical kink. Both of these variations occur at positions typically participating in the formation of a catalytically important proton transfer network. An alternate means of stabilizing this proton wire was observed in the A3DFK9 crystal structures.


    Organizational Affiliation

    Department of Structural Biology, SUNY at Buffalo, Buffalo, New York 14203, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Short-chain dehydrogenase/reductase SDR
A, B
247Clostridium thermocellum (strain ATCC 27405 / DSM 1237 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372)Mutation(s): 0 
Find proteins for A3DFK9 (Clostridium thermocellum (strain ATCC 27405 / DSM 1237 / NBRC 103400 / NCIMB 10682 / NRRL B-4536 / VPI 7372))
Go to UniProtKB:  A3DFK9
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
THJ
Query on THJ

Download SDF File 
Download CCD File 
A, B
THIOSULFATE
O3 S2
DHCDFWKWKRSZHF-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.698 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.179 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 124.287α = 90.00
b = 124.287β = 90.00
c = 162.608γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHENIXrefinement
AMoREphasing
MOLREPphasing
SCALEPACKdata scaling
HKL-2000data scaling
HKL-2000data collection
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description