Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 75672.13 
• Atom Count: 5335 
• Residue Count: 684 
• Unique protein chains: 1

6CGT

HOXA COMPLEX OF CYCLODEXTRIN GLYCOSYLTRANSFERASE MUTANT

• DOI: 10.2210/pdb6CGT/pdb

• Classification: GLYCOSYLTRANSFERASE
• Organism(s): Bacillus circulans
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 1998-06-06 Released: 1998-10-14 
• Deposition Author(s): Parsiegla, G., Schulz, G.E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.246 
• R-Value Work: 0.167 

Literature

Substrate binding to a cyclodextrin glycosyltransferase and mutations increasing the gamma-cyclodextrin production.

Parsiegla, G., Schmidt, A.K., Schulz, G.E.

(1998) Eur.J.Biochem. 255: 710-717

• PubMed: 9738912 
• Primary Citation of Related Structures:  
  9CGT, 8CGT, 7CGT, 5CGT, 4CGT


• PubMed Abstract: 
  

Bacterial cyclodextrin glycosyltransferases use starch to produce cyclic maltooligosaccharides (cyclodextrins) which are of interest in various applications. The cyclization reaction gives rise to a spectrum of ring sizes consisting of predominantly six to eight glucosyl units. Using the enzyme from Bacillus circulans strain no. 8, binding studies have been performed with several substrates and analogues. The observed binding modes differ in detail, but agree in general with data on homologous enzymes. Based on these binding studies, two mutations were designed that changed the production spectrum from the predominant product beta-cyclodextrin of the wild-type enzyme towards gamma-cyclodextrin, which is of practical interest because it is rare and can encapsulate larger nonpolar compounds.

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Related Citations: 

• Structure of Cyclodextrin Glycosyltransferase Complexed with a Derivative of its Main Product Beta-Cyclodextrin
  Schmidt, A.K.,Cottaz, S.,Driguez, H.,Schulz, G.E.
  (1998) Biochemistry 37: 5909
• Molecular Cloning, Nucleotide Sequence and Expression in Escherichia Coli of the Beta-Cyclodextrin Glycosyltransferase Gene from Bacillus Circulans Strain No. 8
  Nitschke, L.,Heeger, K.,Bender, H.,Schulz, G.E.
  (1990) Appl.Microbiol.Biotechnol. 33: 542
• Structure of Cyclodextrin Glycosyltransferase Refined at 2.0 A Resolution
  Klein, C.,Schulz, G.E.
  (1991) J.Mol.Biol. 217: 737
• Catalytic Center of Cyclodextrin Glycosyltransferase Derived from X-Ray Structure Analysis Combined with Site-Directed Mutagenesis
  Klein, C.,Hollender, J.,Bender, H.,Schulz, G.E.
  (1992) Biochemistry 31: 8740




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Organizational Affiliation: 

Institut für Organische Chemie und Biochemie, Freiburg im Breisgau, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CYCLODEXTRIN GLYCOSYLTRANSFERASE	A	684	Bacillus circulans	Mutation(s): 1  EC: 2.4.1.19
Find proteins for P30920 (Bacillus circulans) Go to UniProtKB:  P30920

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
OPG	A	OXIRANPSEUDOGLUCOSE C7 H12 O5 BDIDRHMZXLEMIZ-CXNFULCWSA-N
GLC	A	ALPHA-D-GLUCOSE C6 H12 O6 WQZGKKKJIJFFOK-DVKNGEFBSA-N
DAG	A	4,6-DIDEOXY-4-AMINO-BETA-D-GLUCOPYRANOSIDE C6 H13 N O4 RJKBJEZZABBYBA-VFUOTHLCSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.246 
• R-Value Work: 0.167 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 93.000	α = 90.00
b = 104.900	β = 90.00
c = 113.700	γ = 90.00

Software Package:

Software Name	Purpose
X-PLOR	phasing
XSCALE	data scaling
X-PLOR	model building
XDS	data scaling
XDS	data reduction
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-06-06 
• Released Date: 1998-10-14 
• Deposition Author(s): Parsiegla, G., Schulz, G.E.

Revision History 

• Version 1.0: 1998-10-14
  Type: Initial release
• Version 1.1: 2008-03-25
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance