PDBsum entry 1czc

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protein ligands links
Transferase PDB id
Protein chain
396 a.a. *
Waters ×160
* Residue conservation analysis
PDB id:
Name: Transferase
Title: Aspartate aminotransferase mutant atb17/139s/142n with gluta
Structure: Protein (aspartate aminotransferase). Chain: a. Synonym: aspat. Engineered: yes. Mutation: yes
Source: Escherichia coli. Organism_taxid: 562. Expressed in: escherichia coli. Expression_system_taxid: 562.
Biol. unit: Dimer (from PDB file)
2.50Å     R-factor:   0.182     R-free:   0.243
Authors: A.Okamoto,S.Oue,T.Yano,H.Kagamiyama
Key ref: S.Oue et al. (2000). Cocrystallization of a mutant aspartate aminotransferase with a C5-dicarboxylic substrate analog: structural comparison with the enzyme-C4-dicarboxylic analog complex. J Biochem, 127, 337-343. PubMed id: 10731702
02-Sep-99     Release date:   28-Feb-00    
Go to PROCHECK summary

Protein chain
Pfam   ArchSchema ?
P00509  (AAT_ECOLI) -  Aspartate aminotransferase
396 a.a.
396 a.a.*
Key:    PfamA domain  Secondary structure  CATH domain
* PDB and UniProt seqs differ at 15 residue positions (black crosses)

 Enzyme reactions 
   Enzyme class: E.C.  - Aspartate transaminase.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]
      Reaction: L-aspartate + 2-oxoglutarate = oxaloacetate + L-glutamate
Bound ligand (Het Group name = GUA)
matches with 90.00% similarity
= oxaloacetate
+ L-glutamate
      Cofactor: Pyridoxal 5'-phosphate
Pyridoxal 5'-phosphate
Bound ligand (Het Group name = PLP) matches with 93.75% similarity
Molecule diagrams generated from .mol files obtained from the KEGG ftp site
 Gene Ontology (GO) functional annotation 
  GO annot!
  Cellular component     cytoplasm   2 terms 
  Biological process     biosynthetic process   4 terms 
  Biochemical function     catalytic activity     8 terms  


J Biochem 127:337-343 (2000)
PubMed id: 10731702  
Cocrystallization of a mutant aspartate aminotransferase with a C5-dicarboxylic substrate analog: structural comparison with the enzyme-C4-dicarboxylic analog complex.
S.Oue, A.Okamoto, T.Yano, H.Kagamiyama.
A mutant Escherichia coil aspartate aminotransferase with 17 amino acid substitutions (ATB17), previously created by directed evolution, shows increased activity for beta-branched amino acids and decreased activity for the native substrates, aspartate and glutamate. A new mutant (ATBSN) was generated by changing two of the 17 mutated residues back to the original ones. ATBSN recovered the activities for aspartate and glutamate to the level of the wild-type enzyme while maintaining the enhanced activity of ATB17 for the other amino acid substrates. The absorption spectrum of the bound coenzyme, pyridoxal 5'-phosphate, also returned to the original state. ATBSN shows significantly increased affinity for substrate analogs including succinate and glutarate, analogs of aspartate and glutamate, respectively. Hence, we could cocrystallize ATBSN with succinate or glutarate, and the structures show how the enzyme can bind two kinds of dicarboxylic substrates with different chain lengths. The present results may also provide an insight into the long-standing controversies regarding the mode of binding of glutamate to the wild-type enzyme.

Literature references that cite this PDB file's key reference

  PubMed id Reference
15189147 A.C.Eliot, and J.F.Kirsch (2004).
Pyridoxal phosphate enzymes: mechanistic, structural, and evolutionary considerations.
  Annu Rev Biochem, 73, 383-415.  
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