5A2C

Crystal Structure of Anoxybacillus Alpha-amylase Provides Insights into a New Glycosyl Hydrolase Subclass


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.156 

wwPDB Validation 3D Report Full Report


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Literature

Crystal Structure of Anoxybacillus Alpha-Amylase Provides Insights Into Maltose Binding of a New Glycosyl Hydrolase Subclass.

Chai, K.P.Othman, N.F.B.Teh, A.Ho, K.L.Chan, K.Shamsir, M.S.Goh, K.M.Ng, C.L.

(2016) Sci.Rep. 6: 23126

  • DOI: 10.1038/srep23126
  • Primary Citation of Related Structures:  5A2A, 5A2B

  • PubMed Abstract: 
  • A new subfamily of glycosyl hydrolase family GH13 was recently proposed for α-amylases from Anoxybacillus species (ASKA and ADTA), Geobacillus thermoleovorans (GTA, Pizzo, and GtamyII), Bacillus aquimaris (BaqA), and 95 other putative protein homolog ...

    A new subfamily of glycosyl hydrolase family GH13 was recently proposed for α-amylases from Anoxybacillus species (ASKA and ADTA), Geobacillus thermoleovorans (GTA, Pizzo, and GtamyII), Bacillus aquimaris (BaqA), and 95 other putative protein homologues. To understand this new GH13 subfamily, we report crystal structures of truncated ASKA (TASKA). ASKA is a thermostable enzyme capable of producing high levels of maltose. Unlike GTA, biochemical analysis showed that Ca(2+) ion supplementation enhances the catalytic activities of ASKA and TASKA. The crystal structures reveal the presence of four Ca(2+) ion binding sites, with three of these binding sites are highly conserved among Anoxybacillus α-amylases. This work provides structural insights into this new GH13 subfamily both in the apo form and in complex with maltose. Furthermore, structural comparison of TASKA and GTA provides an overview of the conformational changes accompanying maltose binding at each subsite.


    Organizational Affiliation

    Universiti Teknologi Malaysia, Faculty of Biosciences and Medical Engineering, 81310 Skudai, Johor, Malaysia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALPHA-AMYLASE
A
497Anoxybacillus sp. SK3-4EC: 3.2.1.1
Find proteins for I1VWH9 (Anoxybacillus sp. SK3-4)
Go to UniProtKB:  I1VWH9
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAL
Query on MAL

Download SDF File 
Download CCD File 
A
MALTOSE
C12 H22 O11
GUBGYTABKSRVRQ-ASMJPISFSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.156 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 61.816α = 90.00
b = 63.532β = 90.00
c = 122.970γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-03-30
    Type: Initial release