3KWX

Chemically modified Taka alpha-amylase

• PDB DOI: https://doi.org/10.2210/pdb3KWX/pdb

• Classification: HYDROLASE
• Organism(s): Aspergillus oryzae
• Mutation(s): No 


• Deposited: 2009-12-01 Released: 2009-12-29 
• Deposition Author(s): Siddiqui, K.S., Harrop, S.J., Poljak, A., De Francisci, D., Guerriero, G., Pilak, O., Burg, D., Raftery, M.J., Parkin, D.M., Trewhella, J., Cavicchioli, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.210 
• R-Value Work: 0.175 
• R-Value Observed: 0.177 

Literature

A Modified alpha-amylase with a molten-globule state has enhanced thermal stability

Siddiqui, K.S., Poljak, A., De Francisci, D., Guerriero, G., Pilak, O., Burg, D., Raftery, M.J., Parkin, D.M., Trewhella, J., Cavicchioli, R.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 52.79 kDa 
• Atom Count: 3,977 
• Modelled Residue Count: 476 
• Deposited Residue Count: 478 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha-amylase A type-1/2	A	478	Aspergillus oryzae	Mutation(s): 0  EC: 3.2.1.1
UniProt
Find proteins for P0C1B3 (Aspergillus oryzae (strain ATCC 42149 / RIB 40)) Explore P0C1B3  Go to UniProtKB:  P0C1B3

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	C [auth A]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.210 
• R-Value Work: 0.175 
• R-Value Observed: 0.177 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 120.727	α = 90
b = 120.727	β = 90
c = 115.676	γ = 120

Software Package:

Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-12-29 
Deposition Author(s): Siddiqui, K.S., Harrop, S.J., Poljak, A., De Francisci, D., Guerriero, G., Pilak, O., Burg, D., Raftery, M.J., Parkin, D.M., Trewhella, J., Cavicchioli, R.

Revision History  

• Version 1.0: 2009-12-29
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.2: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Data collection, Derived calculations, Structure summary
• Version 1.3: 2023-11-01
  Changes: Data collection, Database references, Refinement description, Structure summary