1DTU

BACILLUS CIRCULANS STRAIN 251 CYCLODEXTRIN GLYCOSYLTRANSFERASE: A MUTANT Y89D/S146P COMPLEXED TO AN HEXASACCHARIDE INHIBITOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Rational design of cyclodextrin glycosyltransferase from Bacillus circulans strain 251 to increase alpha-cyclodextrin production.

van der Veen, B.A.Uitdehaag, J.C.Penninga, D.van Alebeek, G.J.Smith, L.M.Dijkstra, B.W.Dijkhuizen, L.

(2000) J.Mol.Biol. 296: 1027-1038

  • DOI: 10.1006/jmbi.2000.3528

  • PubMed Abstract: 
  • Cyclodextrin glycosyltransferases (CGTase) (EC 2.4.1.19) are extracellular bacterial enzymes that generate cyclodextrins from starch. All known CGTases produce mixtures of alpha, beta, and gamma-cyclodextrins. A maltononaose inhibitor bound to the ac ...

    Cyclodextrin glycosyltransferases (CGTase) (EC 2.4.1.19) are extracellular bacterial enzymes that generate cyclodextrins from starch. All known CGTases produce mixtures of alpha, beta, and gamma-cyclodextrins. A maltononaose inhibitor bound to the active site of the CGTase from Bacillus circulans strain 251 revealed sugar binding subsites, distant from the catalytic residues, which have been proposed to be involved in the cyclodextrin size specificity of these enzymes. To probe the importance of these distant substrate binding subsites for the alpha, beta, and gamma-cyclodextrin product ratios of the various CGTases, we have constructed three single and one double mutant, Y89G, Y89D, S146P and Y89D/S146P, using site-directed mutagenesis. The mutations affected the cyclization, coupling; disproportionation and hydrolyzing reactions of the enzyme. The double mutant Y89D/S146P showed a twofold increase in the production of alpha-cyclodextrin from starch. This mutant protein was crystallized and its X-ray structure, in a complex with a maltohexaose inhibitor, was determined at 2.4 A resolution. The bound maltohexaose molecule displayed a binding different from the maltononaose inhibitor, allowing rationalization of the observed change in product specificity. Hydrogen bonds (S146) and hydrophobic contacts (Y89) appear to contribute strongly to the size of cyclodextrin products formed and thus to CGTase product specificity. Changes in sugar binding subsites -3 and -7 thus result in mutant proteins with changed cyclodextrin production specificity.


    Related Citations: 
    • Engineering of Cyclodextrin Product Specificity and pH Optima of the Thermostable Cyclodextrin Glycosyltransferase from Thermoanaerobacterium thermosulfurigenes EM1
      Wind, R.D.,Uitdehaag, J.C.M.,Buitelaar, R.M.,Dijkstra, B.W.,Dijkhuizen, L.
      (1998) J.Biol.Chem. 273: 5771
    • Site Directed Mutagenesis in Tyrosine 195 of Cyclodextrin Glycosyltransferase from Bacillus circulans Strain 251 Affect Activity and Product Specificity
      Penninga, D.,Strokopytov, B.,Rozeboom, H.J.,Lawson, C.L.,Dijkstra, B.W.,Bergsma, J.,Dijkhuizen, L.
      (1995) Biochemistry 34: 3368
    • 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

    Department of Microbiology Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, Kerklaan 30, Haren, 9751 NN, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (CYCLODEXTRIN GLYCOSYLTRANSFERASE)
A
686Bacillus circulansMutation(s): 2 
Gene Names: cgt
EC: 2.4.1.19
Find proteins for P43379 (Bacillus circulans)
Go to UniProtKB:  P43379
Small Molecules
Ligands 5 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

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

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Download CCD File 
A
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
GLC
Query on GLC

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

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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: 2.4 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.206 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 120.445α = 90.00
b = 111.160β = 90.00
c = 65.758γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
BIOMOLdata scaling
TNTphasing
TNTrefinement
BIOMOLdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    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, Structure summary