2AAT | pdb_00002aat

2.8-ANGSTROMS-RESOLUTION CRYSTAL STRUCTURE OF AN ACTIVE-SITE MUTANT OF ASPARTATE AMINOTRANSFERASE FROM ESCHERICHIA COLI

• PDB DOI: https://doi.org/10.2210/pdb2AAT/pdb

• Classification: TRANSFERASE(AMINOTRANSFERASE)
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1989-05-30 Released: 1989-10-15 
• Deposition Author(s): Smith, D., Almo, S.C., Toney, M., Ringe, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Observed: 
  0.220 (Depositor) 

Literature

2.8-A-resolution crystal structure of an active-site mutant of aspartate aminotransferase from Escherichia coli.

Smith, D.L., Almo, S.C., Toney, M.D., Ringe, D.

(1989) Biochemistry 28: 8161-8167

• PubMed: 2513875 
• DOI: https://doi.org/10.1021/bi00446a030
• Primary Citation Related Structures: 
  2AAT


• PubMed Abstract: 
  

  The three-dimensional structure of a mutant of the aspartate aminotransferase from Escherichia coli, in which the active-site lysine has been substituted by alanine (K258A), has been determined at 2.8-A resolution by X-ray diffraction. The mutant enzyme contains pyridoxamine phosphate as cofactor. The structure is compared to that of the mitochondrial aspartate aminotransferase. The most striking differences, aside from the absence of the lysine side chain, occur in the positions of the pyridoxamine group and of tryptophan 140.

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Organizational Affiliation: 
• Department of Chemistry, Massachusetts Institute of Technology, Cambridge 02139.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content 

• Total Structure Weight: 43.91 kDa 
• Atom Count: 3,086 
• Modeled Residue Count: 396 
• Deposited Residue Count: 396 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ASPARTATE AMINOTRANSFERASE	A	396	Escherichia coli	Mutation(s): 1  EC: 2.6.1.1
UniProt
Find proteins for P00509 (Escherichia coli (strain K12)) Explore P00509  Go to UniProtKB:  P00509

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PMP	C [auth A]	4'-DEOXY-4'-AMINOPYRIDOXAL-5'-PHOSPHATE C8 H13 N2 O5 P ZMJGSOSNSPKHNH-UHFFFAOYSA-N
SO4	B [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Observed: 0.220 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 156.8	α = 90
b = 86.74	β = 90
c = 79.84	γ = 90

Software Package:

Software Name	Purpose
PROLSQ	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1989-10-15 
Deposition Author(s): Smith, D., Almo, S.C., Toney, M., Ringe, D.

Revision History  

• Version 1.0: 1989-10-15
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2012-07-25
  Changes: Structure summary
• Version 1.4: 2020-07-29
  Changes: Database references, Derived calculations, Other, Structure summary
• Version 1.5: 2024-02-14
  Changes: Data collection, Database references