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Crystal structure of the pig pancreatic alpha-amylase complexed with malto-oligosaacharides under the effect of the chloride ion


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.159 

wwPDB Validation 3D Report Full Report



Literature

Molecular Basis of the Effects of Chloride Ion on the Acid-Base Catalyst in the Mechanism of Pancreatic alpha-Amylase

Qian, M.Ajandouz, E.H.Payan, F.Nahoum, V.

(2005) Biochemistry 44: 3194-3201

  • DOI: 10.1021/bi048201t
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Pig pancreatic alpha-amylase (PPA), an enzyme belonging to the alpha-amylase family, is involved in the degradation of starch. Like some other members of this family, PPA requires chloride to reach maximum activity levels. To further explain the mech ...

    Pig pancreatic alpha-amylase (PPA), an enzyme belonging to the alpha-amylase family, is involved in the degradation of starch. Like some other members of this family, PPA requires chloride to reach maximum activity levels. To further explain the mechanism of chloride activation, a crystal of wild-type PPA soaked with maltopentaose using a chloride-free buffer was analyzed by X-ray crystallography. A conspicuous reorientation of the acid/base catalyst Glu233 residue was found to occur. The structural results, along with kinetic data, show that the acid/base catalyst is maintained in the active site, in an optimum position, pointing toward the scissile bond-atom, due to the presence of chloride ions. The present study therefore explains the mechanism of PPA activation by chloride ions.


    Related Citations: 
    • Enzyme-catalyzed condensation Reaction in a Mammalian alpha-amylase. High-resolution structural analysis of an enzyme-inhibitor complex
      Qian, M., Nahoum, V., Bonicel, J., Bischoff, H., Henrissat, B., Payan, F.
      (2001) Biochemistry 40: 7700
    • Crystal structure of the pig pancreatic alpha-amylase complexed with malto-oligosaccharides
      Payan, F., Qian, M.
      (2003) J Protein Chem 22: 275

    Organizational Affiliation

    Department of Chemical Biology, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Peking University, Beijing 100871, People's Republic of China.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-amylase, pancreatic
A
496Sus scrofaMutation(s): 0 
Gene Names: AMY2
EC: 3.2.1.1
Find proteins for P00690 (Sus scrofa)
Go to UniProtKB:  P00690
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GLC
Query on GLC

Download CCD File 
A
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
BGC
Query on BGC

Download CCD File 
A
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
EDO
Query on EDO

Download CCD File 
A
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
AL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.01 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.09α = 90
b = 113.298β = 90
c = 117.221γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
AMoREphasing
X-PLORrefinement
CCP4data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-03-15
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-07-25
    Changes: Data collection, Source and taxonomy, Structure summary
  • Version 2.0: 2019-12-25
    Changes: Data collection, Database references, Derived calculations, Polymer sequence