1WZA

Crystal structure of alpha-amylase from H.orenii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1016/j.febslet.2006.04.017

  • 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 conserv ...

    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.


    Related Citations: 
    • Cloning, sequencing and expression of an alpha-amylase gene, amyA, from the thermophilic halophile Halothermothrix orenii and purification and biochemical characterization of the recombinant enzyme
      Mijts, B.N.,Patel, B.K.C.
      (2002) Microbiology (Reading, Engl.) 148: 2343


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
alpha-amylase A
A
488Halothermothrix oreniiMutation(s): 0 
Gene Names: amyA
Find proteins for Q8GPL8 (Halothermothrix orenii)
Go to UniProtKB:  Q8GPL8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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: 1.6 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 55.126α = 90.00
b = 61.658β = 90.00
c = 147.625γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOLREPphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-04-11
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance