Barley alpha-amylase isozyme 1 (AMY1) double mutant Y105A/Y380A in complex with inhibitor acarbose

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

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This is version 1.4 of the entry. See complete history


Multi-site substrate binding and interplay in barley alpha-amylase 1

Nielsen, M.M.Seo, E.S.Bozonnet, S.Aghajari, N.Robert, X.Haser, R.Svensson, B.

(2008) FEBS Lett 582: 2567-2571

  • DOI: https://doi.org/10.1016/j.febslet.2008.06.027
  • Primary Citation of Related Structures:  
    3BSG, 3BSH

  • PubMed Abstract: 

    Certain starch hydrolases possess secondary carbohydrate binding sites outside of the active site, suggesting that multi-site substrate interactions are functionally significant. In barley alpha-amylase both Tyr380, situated on a remote non-catalytic domain, and Tyr105 in subsite -6 of the active site cleft are principal carbohydrate binding residues. The dual active site/secondary site mutants Y105A/Y380A and Y105A/Y380M show that each of Tyr380 and Tyr105 is important, albeit not essential for binding, degradation, and multiple attack on polysaccharides, while Tyr105 predominates in oligosaccharide hydrolysis. Additional delicate structure/function relationships of the secondary site are uncovered using Y380A/H395A, Y380A, and H395A AMY1 mutants.

  • Organizational Affiliation

    Enzyme and Protein Chemistry, Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Lyngby, Denmark.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-amylase type A isozyme414Hordeum vulgareMutation(s): 2 
Find proteins for P00693 (Hordeum vulgare)
Explore P00693 
Go to UniProtKB:  P00693
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00693
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.5α = 90
b = 72.1β = 90
c = 60.8γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-08-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2021-11-10
    Changes: Database references, Structure summary
  • Version 1.4: 2023-11-01
    Changes: Data collection, Refinement description