1D3C

MICHAELIS COMPLEX OF BACILLUS CIRCULANS STRAIN 251 CYCLODEXTRIN GLYCOSYLTRANSFERASE WITH GAMMA-CYCLODEXTRIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 

wwPDB Validation   3D Report Full Report


This is version 2.2 of the entry. See complete history


Literature

The cyclization mechanism of cyclodextrin glycosyltransferase (CGTase) as revealed by a gamma-cyclodextrin-CGTase complex at 1.8-A resolution.

Uitdehaag, J.C.Kalk, K.H.van Der Veen, B.A.Dijkhuizen, L.Dijkstra, B.W.

(1999) J Biol Chem 274: 34868-34876

  • DOI: https://doi.org/10.1074/jbc.274.49.34868
  • Primary Citation of Related Structures:  
    1D3C

  • PubMed Abstract: 

    The enzyme cyclodextrin glycosyltransferase is closely related to alpha-amylases but has the unique ability to produce cyclodextrins (circular alpha(1-->4)-linked glucoses) from starch. To characterize this specificity we determined a 1.8-A structure of an E257Q/D229N mutant cyclodextrin glycosyltransferase in complex with its product gamma-cyclodextrin, which reveals for the first time how cyclodextrin is competently bound. Across subsites -2, -1, and +1, the cyclodextrin ring binds in a twisted mode similar to linear sugars, giving rise to deformation of its circular symmetry. At subsites -3 and +2, the cyclodextrin binds in a manner different from linear sugars. Sequence comparisons and site-directed mutagenesis experiments support the conclusion that subsites -3 and +2 confer the cyclization activity in addition to subsite -6 and Tyr-195. On this basis, a role of the individual residues during the cyclization reaction cycle is proposed.


  • Organizational Affiliation

    BIOSON Research Institute, Laboratory of Biophysical Chemistry, Groningen Biomolecular Sciences, University of Groningen, Nijenborgh 4, 9747AG Groningen, the Netherlands.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYCLODEXTRIN GLYCOSYLTRANSFERASE686Niallia circulansMutation(s): 2 
EC: 2.4.1.19
UniProt
Find proteins for P43379 (Niallia circulans)
Explore P43379 
Go to UniProtKB:  P43379
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43379
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose
B
2N/A
Glycosylation Resources
GlyTouCan:  G07411ON
GlyCosmos:  G07411ON
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Cyclooctakis-(1-4)-(alpha-D-glucopyranose)
C, D, E
8N/A
Glycosylation Resources
GlyTouCan:  G28503YQ
GlyCosmos:  G28503YQ
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.791α = 90
b = 109.532β = 90
c = 65.223γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
TNTrefinement
TNTphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-12-22
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2021-11-03
    Changes: Database references, Structure summary
  • Version 2.2: 2023-08-09
    Changes: Data collection, Refinement description