1AVA

AMY2/BASI PROTEIN-PROTEIN COMPLEX FROM BARLEY SEED

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.208 
  • R-Value Observed: 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

  • DOI: 10.1016/s0969-2126(98)00066-5
  • Primary Citation of Related Structures:  
    1AVA

  • 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 affinity to the endogenous inhibitor BASI (barley alpha-amylase/subtilisin inhibitor) whereas the minor isozyme (AMY1) is not inhibited ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BARLEY ALPHA-AMYLASE 2(CV MENUET)A, B403Hordeum vulgareMutation(s): 0 
Gene Names: AMY1.2
EC: 3.2.1.1
UniProt
Find proteins for P04063 (Hordeum vulgare)
Explore P04063 
Go to UniProtKB:  P04063
Entity Groups  
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UniProt GroupP04063
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BARLEY ALPHA-AMYLASE/SUBTILISIN INHIBITORC, D181Hordeum vulgareMutation(s): 0 
UniProt
Find proteins for P07596 (Hordeum vulgare)
Explore P07596 
Go to UniProtKB:  P07596
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07596
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.5α = 90
b = 96.18β = 90
c = 170.15γ = 90
Software Package:
Software NamePurpose
XDSdata scaling
XSCALEdata scaling
X-PLORmodel building
X-PLORrefinement
XDSdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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