Crystal structure of alpha-amylase from H.orenii

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 

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This is version 1.3 of the entry. See complete history


Crystal structure of AmyA lacks acidic surface and provide insights into protein stability at poly-extreme condition.

Sivakumar, N.Li, N.Tang, J.W.Patel, B.K.Swaminathan, K.

(2006) FEBS Lett 580: 2646-2652

  • DOI: https://doi.org/10.1016/j.febslet.2006.04.017
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Here we report the first crystal structure of a protein, AmyA, a secretory alpha-amylase isolated from Halothermothrix orenii, which is both halophilic and thermophilic. The crystal structure was determined at 1.6 A resolution. AmyA lacks the conserved acidic surface, which is considered essential for protein stability at high salinity. Sedimentation velocity and CD experiments on AmyA reveal the formation of unique reversible poly-dispersed oligomers that show unusually high thermal stability. These studies provide valuable insight into the structural elements that contribute to the stability of AmyA at both physical and chemical extremes and their functional implications.

  • Organizational Affiliation

    Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673, Singapore.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
alpha-amylase A488Halothermothrix oreniiMutation(s): 0 
Gene Names: AMYA
Find proteins for Q8GPL8 (Halothermothrix orenii)
Explore Q8GPL8 
Go to UniProtKB:  Q8GPL8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8GPL8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.126α = 90
b = 61.658β = 90
c = 147.625γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-11
    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: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description