2Z8G

Aspergillus niger ATCC9642 isopullulanase complexed with isopanose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

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This is version 2.0 of the entry. See complete history


Literature

Crystal Structure of Aspergillus niger Isopullulanase, a Member of Glycoside Hydrolase Family 49

Mizuno, M.Koide, A.Yamamura, A.Akeboshi, H.Yoshida, H.Kamitori, S.Sakano, Y.Nishikawa, A.Tonozuka, T.

(2008) J Mol Biol 376: 210-220

  • DOI: https://doi.org/10.1016/j.jmb.2007.11.098
  • Primary Citation of Related Structures:  
    1WMR, 1X0C, 2Z8G

  • PubMed Abstract: 

    An isopullulanase (IPU) from Aspergillus niger ATCC9642 hydrolyzes alpha-1,4-glucosidic linkages of pullulan to produce isopanose. Although IPU does not hydrolyze dextran, it is classified into glycoside hydrolase family 49 (GH49), major members of which are dextran-hydrolyzing enzymes. IPU is highly glycosylated, making it difficult to obtain its crystal. We used endoglycosidase H(f) to cleave the N-linked oligosaccharides of IPU, and we here determined the unliganded and isopanose-complexed forms of IPU, both solved at 1.7-A resolution. IPU is composed of domains N and C joined by a short linker, with electron density maps for 11 or 12 N-acetylglucosamine residues per molecule. Domain N consists of 13 beta-strands and forms a beta-sandwich. Domain C, where the active site is located, forms a right-handed beta-helix, and the lengths of the pitches of each coil of the beta-helix are similar to those of GH49 dextranase and GH28 polygalacturonase. The entire structure of IPU resembles that of a GH49 enzyme, Penicillium minioluteum dextranase (Dex49A), despite a difference in substrate specificity. Compared with the active sites of IPU and Dex49A, the amino acid residues participating in subsites +2 and +3 are not conserved, and the glucose residues of isopanose bound to IPU completely differ in orientation from the corresponding glucose residues of isomaltose bound to Dex49A. The shape of the catalytic cleft characterized by the seventh coil of the beta-helix and a loop from domain N appears to be critical in determining the specificity of IPU for pullulan.


  • Organizational Affiliation

    Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isopullulanase
A, B
549Aspergillus nigerMutation(s): 0 
EC: 3.2.1.57
UniProt
Find proteins for O00105 (Aspergillus niger)
Explore O00105 
Go to UniProtKB:  O00105
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00105
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-(1-6)-beta-D-glucopyranose
C, D
3N/A
Glycosylation Resources
GlyTouCan:  G78902VT
GlyCosmos:  G78902VT
GlyGen:  G78902VT
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
AA [auth B]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
AA [auth B],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.672α = 90
b = 99.387β = 90
c = 134.987γ = 90
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary