2ZEX

Family 16 carbohydrate binding module

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.156 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Molecular Basis for the Selectivity and Specificity of Ligand Recognition by the Family 16 Carbohydrate-binding Modules from Thermoanaerobacterium polysaccharolyticum ManA

Bae, B., Ohene-Adjei, S., Kocherginskaya, S., Mackie, R.I., Spies, M.A., Cann, I.K., Nair, S.K.

(2008) J.Biol.Chem. 283: 12415-12425

  • DOI: 10.1074/jbc.M706513200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Enzymes that hydrolyze complex polysaccharides into simple sugars are modular in architecture and consist of single or multiple catalytic domains fused to targeting modules called carbohydrate-binding modules (CBMs). CBMs bind to their ligands with h ...

    Enzymes that hydrolyze complex polysaccharides into simple sugars are modular in architecture and consist of single or multiple catalytic domains fused to targeting modules called carbohydrate-binding modules (CBMs). CBMs bind to their ligands with high affinity and increase the efficiency of the catalytic components by targeting the enzymes to its substrate. Here we utilized a multidisciplinary approach to characterize each of the two family 16 carbohydrate-binding domain components of the highly active mannanase from the thermophile Thermoanaerobacterium polysaccharolyticum. These represent the first crystal structures of family 16 CBMs. Calorimetric analysis showed that although these CBMs demonstrate high specificity toward beta-1,4-linked sugars, they can engage both cello- and mannopolysaccharides. To elucidate the molecular basis for this specificity and selectivity, we have determined high resolution crystal structures of each of the two CBMs, as well as of binary complexes of CBM16-1 bound to either mannopentaose or cellopentaose. These results provide detailed molecular insights into ligand recognition and yield a framework for rational engineering experiments designed to expand the natural repertoire of these targeting modules.

    Organizational Affiliation: 

    Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
S-layer associated multidomain endoglucanase
A, B
147Caldanaerobius polysaccharolyticusMutation(s): 0 
Gene Names: celA
Find proteins for Q9ZA17 (Caldanaerobius polysaccharolyticus)
Go to UniProtKB:  Q9ZA17
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
BGC
Query on BGC
Download SDF File 
Download CCD File 
A, B
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.156 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 32.466α = 62.03
b = 48.829β = 84.88
c = 49.356γ = 85.95
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
MAR345dtbdata collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2007-12-18 
  • Released Date: 2008-03-04 
  • Deposition Author(s): Bae, B., Nair, S.K.

Revision History 

  • Version 1.0: 2008-03-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance