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AMY2/BASI PROTEIN-PROTEIN COMPLEX FROM BARLEY SEED


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Barley alpha-amylase bound to its endogenous protein inhibitor BASI: crystal structure of the complex at 1.9 A resolution.

Vallee, F.Kadziola, A.Bourne, Y.Juy, M.Rodenburg, K.W.Svensson, B.Haser, R.

(1998) Structure 6: 649-659


  • PubMed Abstract: 
  • Barley alpha-amylase is a 45 kDa enzyme which is involved in starch degradation during barley seed germination. The released sugars provide the plant embryo with energy for growth. The major barley alpha-amylase isozyme (AMY2) binds with high affinit ...

    Barley alpha-amylase is a 45 kDa enzyme which is involved in starch degradation during barley seed germination. The released sugars provide the plant embryo with energy for growth. The major barley alpha-amylase isozyme (AMY2) binds with high affinity to the endogenous inhibitor BASI (barley alpha-amylase/subtilisin inhibitor) whereas the minor isozyme (AMY1) is not inhibited. BASI is a 19.6 kDa bifunctional protein that can simultaneously inhibit AMY2 and serine proteases of the subtilisin family. This inhibitor may therefore prevent degradation of the endosperm starch during premature sprouting and protect the seed from attack by pathogens secreting proteases.


    Related Citations: 
    • Characterization, Crystallization and Preliminary X-Ray Crystallographic Analysis of the Complex between Barley Alpha-Amylase and the Bifunctional Alpha-Amylase/Subtilisin Inhibitor from Barley Seeds
      Vallee, F.,Kadziola, A.,Bourne, Y.,Abe, J.,Svensson, B.,Haser, R.
      (1994) J.Mol.Biol. 236: 368


    Organizational Affiliation

    Macromolécules Biologiques, UPR 9039, Institut de Biologie Structurale et Microbiologie, CNRS, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BARLEY ALPHA-AMYLASE 2(CV MENUET)
A, B
403Hordeum vulgareGene Names: AMY1.2
EC: 3.2.1.1
Find proteins for P04063 (Hordeum vulgare)
Go to UniProtKB:  P04063
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BARLEY ALPHA-AMYLASE/SUBTILISIN INHIBITOR
C, D
181Hordeum vulgareN/A
Find proteins for P07596 (Hordeum vulgare)
Go to UniProtKB:  P07596
Small Molecules
Ligands 1 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 74.500α = 90.00
b = 96.180β = 90.00
c = 170.150γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
XDSdata reduction
XSCALEdata scaling
X-PLORphasing
X-PLORmodel building
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-03-16
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance