3BSG

Barley alpha-amylase isozyme 1 (AMY1) H395A mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alpha-amylase type A isozymeA414Hordeum vulgareMutation(s): 1 
Gene Names: AMY1.1
EC: 3.2.1.1
UniProt
Find proteins for P00693 (Hordeum vulgare)
Explore P00693 
Go to UniProtKB:  P00693
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
B [auth A], C [auth A], D [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.15α = 90
b = 72.23β = 90
c = 61.33γ = 90
Software Package:
Software NamePurpose
CNSrefinement
ADSCdata collection
XDSdata reduction
XSCALEdata scaling
CNSphasing

Structure Validation

View Full Validation Report



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