2TAA

STRUCTURE AND POSSIBLE CATALYTIC RESIDUES OF TAKA-AMYLASE A

• PDB DOI: https://doi.org/10.2210/pdb2TAA/pdb
• Entry: 2TAA supersedes: 1TAA

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


• Deposited: 1982-10-18 Released: 1982-10-21 
• Deposition Author(s): Kusunoki, M., Matsuura, Y., Tanaka, N., Kakudo, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å

Literature

Structure and possible catalytic residues of Taka-amylase A

Matsuura, Y., Kusunoki, M., Harada, W., Kakudo, M.

(1984) J Biochem 95: 697-702

• PubMed: 6609921 
• DOI: https://doi.org/10.1093/oxfordjournals.jbchem.a134659
• Primary Citation of Related Structures:  
  2TAA


• PubMed Abstract: 
  

  A complete molecular model of Taka-amylase A consisting of 478 amino acid residues was built with the aid of amino acid sequence data. Some typical structural features of the molecule are described. A model fitting of an amylose chain in the catalytic site of the enzyme showed a possible productive binding mode between substrate and enzyme. On the basis of the difference Fourier analysis and the model fitting study, glutamic acid (Glu230) and aspartic acid (Asp297), which are located at the bottom of the cleft, were concluded to be the catalytic residues, serving as the general acid and base, respectively.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Biological Assembly 3  

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

Biological assembly 3 assigned by authors.

Macromolecule Content

• Total Structure Weight: 157.43 kDa 
• Atom Count: 11,073 
• Modelled Residue Count: 1,434 
• Deposited Residue Count: 1,434 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TAKA-AMYLASE A	A, B, C	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 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	D [auth A], E [auth B], F [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 91.9	α = 90
b = 133.3	β = 102.7
c = 94.3	γ = 90

Structure Validation

Entry History 

Deposition Data

• Released Date: 1982-10-21 
Deposition Author(s): Kusunoki, M., Matsuura, Y., Tanaka, N., Kakudo, M.
• This entry supersedes: 1TAA

Revision History  

• Version 1.0: 1982-10-21
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.3: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other