1A47

CGTASE FROM THERMOANAEROBACTERIUM THERMOSULFURIGENES EM1 IN COMPLEX WITH A MALTOHEXAOSE INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.56 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Engineering of cyclodextrin product specificity and pH optima of the thermostable cyclodextrin glycosyltransferase from Thermoanaerobacterium thermosulfurigenes EM1.

Wind, R.D.Uitdehaag, J.C.Buitelaar, R.M.Dijkstra, B.W.Dijkhuizen, L.

(1998) J.Biol.Chem. 273: 5771-5779

  • Also Cited By: 3BMV, 3BMW

  • PubMed Abstract: 
  • The product specificity and pH optimum of the thermostable cyclodextrin glycosyltransferase (CGTase) from Thermoanaerobacterium thermosulfurigenes EM1 was engineered using a combination of x-ray crystallography and site-directed mutagenesis. Previous ...

    The product specificity and pH optimum of the thermostable cyclodextrin glycosyltransferase (CGTase) from Thermoanaerobacterium thermosulfurigenes EM1 was engineered using a combination of x-ray crystallography and site-directed mutagenesis. Previously, a crystal soaking experiment with the Bacillus circulans strain 251 beta-CGTase had revealed a maltononaose inhibitor bound to the enzyme in an extended conformation. An identical experiment with the CGTase from T. thermosulfurigenes EM1 resulted in a 2.6-A resolution x-ray structure of a complex with a maltohexaose inhibitor, bound in a different conformation. We hypothesize that the new maltohexaose conformation is related to the enhanced alpha-cyclodextrin production of the CGTase. The detailed structural information subsequently allowed engineering of the cyclodextrin product specificity of the CGTase from T. thermosulfurigenes EM1 by site-directed mutagenesis. Mutation D371R was aimed at hindering the maltohexaose conformation and resulted in enhanced production of larger size cyclodextrins (beta- and gamma-CD). Mutation D197H was aimed at stabilization of the new maltohexaose conformation and resulted in increased production of alpha-CD. Glu258 is involved in catalysis in CGTases as well as alpha-amylases, and is the proton donor in the first step of the cyclization reaction. Amino acids close to Glu258 in the CGTase from T. thermosulfurigenes EM1 were changed. Phe284 was replaced by Lys and Asn327 by Asp. The mutants showed changes in both the high and low pH slopes of the optimum curve for cyclization and hydrolysis when compared with the wild-type enzyme. This suggests that the pH optimum curve of CGTase is determined only by residue Glu258.


    Related Citations: 
    • Crystal Structure at 2.3 A Resolution and Revised Nucleotide Sequence of the Thermostable Cyclodextrin Glycosyltransferase from Thermoanaerobacterium Thermosulfurigenes Em1
      Knegtel, R.M.,Wind, R.D.,Rozeboom, H.J.,Kalk, K.H.,Buitelaar, R.M.,Dijkhuizen, L.,Dijkstra, B.W.
      (1996) J.Mol.Biol. 256: 611
    • Structure of Cyclodextrin Glycosyltransferase Complexed with a Maltononaose Inhibitor at 2.6 Angstrom Resolution. Implications for Product Specificity
      Strokopytov, B.,Knegtel, R.M.,Penninga, D.,Rozeboom, H.J.,Kalk, K.H.,Dijkhuizen, L.,Dijkstra, B.W.
      (1996) Biochemistry 35: 4241


    Organizational Affiliation

    Agrotechnological Research Institute, P. O. Box 17, 6700 AA Wageningen, The Netherlands. r.d.wind@ato.dlo.nl




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYCLODEXTRIN GLYCOSYLTRANSFERASE
A
683Thermoanaerobacterium thermosulfurigenesGene Names: amyA
EC: 2.4.1.19
Find proteins for P26827 (Thermoanaerobacterium thermosulfurigenes)
Go to UniProtKB:  P26827
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADH
Query on ADH

Download SDF File 
Download CCD File 
A
1-AMINO-2,3-DIHYDROXY-5-HYDROXYMETHYL CYCLOHEX-5-ENE
C7 H13 N O3
BMZJPVSGERKRHP-ACZMJKKPSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
GLC
Query on GLC

Download SDF File 
Download CCD File 
A
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
G6D
Query on G6D

Download SDF File 
Download CCD File 
A
6-DEOXY-ALPHA-D-GLUCOSE
D-Quinovose
C6 H12 O5
SHZGCJCMOBCMKK-DVKNGEFBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.56 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 73.996α = 90.00
b = 97.789β = 90.00
c = 116.263γ = 90.00
Software Package:
Software NamePurpose
TNTrefinement
BIOMOLmodel building
XDSdata reduction
BIOMOLphasing
BIOMOLdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-06-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 2.0: 2017-10-25
    Type: Atomic model, Derived calculations, Non-polymer description, Other, Structure summary