Biological Assembly 1  

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 12077.71 
• Atom Count: 879 
• Residue Count: 103 
• Unique protein chains: 1

2J71

alpha-glucan recognition by a family 41 carbohydrate-binding module from Thermotoga maritima pullulanase PulA

• DOI: 10.2210/pdb2J71/pdb

• Classification: HYDROLASE
• Organism(s): Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2006-10-05 Released: 2006-10-17 
• Deposition Author(s): Lammerts van Bueren, A., Boraston, A.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.69 Å
• R-Value Free: 0.240 
• R-Value Work: 0.205 

Literature

The Structural Basis of Alpha-Glucan Recognition by a Family 41 Carbohydrate-Binding Module from Thermotoga Maritima

Lammerts Van Bueren, A., Boraston, A.B.

(2007) J.Mol.Biol. 365: 555

• PubMed: 17095014 
• DOI: 10.1016/j.jmb.2006.10.018
• Primary Citation of Related Structures:  
  2J73, 2J72


• PubMed Abstract: 
  

Starch recognition by carbohydrate-binding modules (CBMs) is important for the activity of starch-degrading enzymes. The N-terminal family 41 CBM, TmCBM41 (from pullulanase PulA secreted by Thermotoga maritima) was shown to have alpha-glucan binding activity with specificity for alpha-1,4-glucans but was able to tolerate the alpha-1,6-linkages found roughly every three or four glucose units in pullulan. Using X-ray crystallography, the structures were solved for TmCBM41 in an uncomplexed form and in complex with maltotetraose and 6(3)-alpha-D-glucosyl-maltotriose (GM3). Ligand binding was facilitated by stacking interactions between the alpha-faces of the glucose residues and two tryptophan side-chains in the two main subsites of the carbohydrate-binding site. Overall, this mode of starch binding is quite well conserved by other starch-binding modules. The structure in complex with GM3 revealed a third binding subsite with the flexibility to accommodate an alpha-1,4- or an alpha-1,6-linked glucose.

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Organizational Affiliation: 

Biochemistry and Microbiology, University of Victoria, PO Box 3055 STN CSC, Victoria, BC, Canada V8W 3P6.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PULLULANASE	A	103	Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)	Mutation(s): 0  Gene Names: pulA EC: 3.2.1.41
Find proteins for O33840 (Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099)) Go to UniProtKB:  O33840

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.69 Å
• R-Value Free: 0.240 
• R-Value Work: 0.205 
• Space Group: H 3 2

Unit Cell:

Length (Å)	Angle (°)
a = 112.504	α = 90.00
b = 112.504	β = 90.00
c = 83.739	γ = 120.00

Software Package:

Software Name	Purpose
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-10-05 
• Released Date: 2006-10-17 
• Deposition Author(s): Lammerts van Bueren, A., Boraston, A.B.

Revision History 

• Version 1.0: 2006-10-17
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance