4UZU

Three-dimensional structure of a variant `Termamyl-like' Geobacillus stearothermophilus alpha-amylase at 1.9 A resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

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Literature

Three-Dimensional Structure of a Variant `Termamyl-Like' Geobacillus Stearothermophilus Alpha-Amylase at 1.9 A Resolution

Offen, W.A., Viksoe-Nielsen, A., Borchert, T.V., Wilson, K.S., Davies, G.J.

(2015) Acta Crystallogr Sect F Struct Biol Cryst Commun 71: 66

  • DOI: 10.1107/S2053230X14026508
  • Primary Citation of Related Structures:  
    4UZU

  • PubMed Abstract: 

    • The enzyme-catalysed degradation of starch is central to many industrial processes, including sugar manufacture and first-generation biofuels. Classical biotechnological platforms involve steam explosion of starch followed by the action of endo-acting glycoside hydrolases termed α-amylases and then exo-acting α-glucosidases (glucoamylases) to yield glucose, which is subsequently processed ...

    The enzyme-catalysed degradation of starch is central to many industrial processes, including sugar manufacture and first-generation biofuels. Classical biotechnological platforms involve steam explosion of starch followed by the action of endo-acting glycoside hydrolases termed α-amylases and then exo-acting α-glucosidases (glucoamylases) to yield glucose, which is subsequently processed. A key enzymatic player in this pipeline is the `Termamyl' class of bacterial α-amylases and designed/evolved variants thereof. Here, the three-dimensional structure of one such Termamyl α-amylase variant based upon the parent Geobacillus stearothermophilus α-amylase is presented. The structure has been solved at 1.9 Å resolution, revealing the classical three-domain fold stabilized by Ca2+ and a Ca2+-Na+-Ca2+ triad. As expected, the structure is similar to the G. stearothermophilus α-amylase but with main-chain deviations of up to 3 Å in some regions, reflecting both the mutations and differing crystal-packing environments.

    Organizational Affiliation: 

    York Structural Biology Laboratory, Department of Chemistry, The University of York, York YO10 5DD, England.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-AMYLASEA513Geobacillus stearothermophilusMutation(s): 1 
Gene Names: amyS
EC: 3.2.1.1
UniProt
Find proteins for P06279 (Geobacillus stearothermophilus)
Explore P06279 
Go to UniProtKB:  P06279
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06279
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: 0.210 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.18α = 90
b = 108.18β = 90
c = 181.49γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-02-04
    Changes: Database references