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PDBsum entry 2yfq

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protein ligands Protein-protein interface(s) links
Oxidoreductase PDB id
2yfq
Jmol
Contents
Protein chains
395 a.a.
Ligands
SO4 ×4
Waters ×6
PDB id:
2yfq
Name: Oxidoreductase
Title: Crystal structure of glutamate dehydrogenase from peptoniphilus asaccharolyticus
Structure: NAD-specific glutamate dehydrogenase. Chain: a, b. Synonym: padgh, NAD-gdh. Engineered: yes
Source: Peptoniphilus asaccharolyticus. Organism_taxid: 1258. Expressed in: escherichia coli. Expression_system_taxid: 469008.
Resolution:
2.94Å     R-factor:   0.243     R-free:   0.286
Authors: T.Oliveira,S.Panjikar,J.B.Carrigan,M.A.Sharkey,M.Hamza,P.C.E A.R.Khan
Key ref: T.Oliveira et al. (2012). Crystal structure of NAD+-dependent Peptoniphilus asaccharolyticus glutamate dehydrogenase reveals determinants of cofactor specificity. J Struct Biol, 177, 543-552. PubMed id: 22068154 DOI: 10.1016/j.jsb.2011.10.006
Date:
07-Apr-11     Release date:   23-Nov-11    
PROCHECK
Go to PROCHECK summary
 Headers
 References

Protein chains
Pfam   ArchSchema ?
P28997  (DHE2_PEPAS) -  NAD-specific glutamate dehydrogenase
Seq:
Struc:
421 a.a.
395 a.a.
Key:    PfamA domain  Secondary structure  CATH domain

 Enzyme reactions 
   Enzyme class: E.C.1.4.1.2  - Glutamate dehydrogenase.
[IntEnz]   [ExPASy]   [KEGG]   [BRENDA]
      Reaction: L-glutamate + H2O + NAD+ = 2-oxoglutarate + NH3 + NADH
L-glutamate
+ H(2)O
+ NAD(+)
= 2-oxoglutarate
+ NH(3)
+ NADH
Molecule diagrams generated from .mol files obtained from the KEGG ftp site
 Gene Ontology (GO) functional annotation 
  GO annot!
  Biological process     oxidation-reduction process   3 terms 
  Biochemical function     oxidoreductase activity     3 terms  

 

 
    reference    
 
 
DOI no: 10.1016/j.jsb.2011.10.006 J Struct Biol 177:543-552 (2012)
PubMed id: 22068154  
 
 
Crystal structure of NAD+-dependent Peptoniphilus asaccharolyticus glutamate dehydrogenase reveals determinants of cofactor specificity.
T.Oliveira, S.Panjikar, J.B.Carrigan, M.Hamza, M.A.Sharkey, P.C.Engel, A.R.Khan.
 
  ABSTRACT  
 
Glutamate dehydrogenases (EC 1.4.1.2-4) catalyse the oxidative deamination of l-glutamate to α-ketoglutarate using NAD(P) as a cofactor. The bacterial enzymes are hexamers and each polypeptide consists of an N-terminal substrate-binding (Domain I) followed by a C-terminal cofactor-binding segment (Domain II). The reaction takes place at the junction of the two domains, which move as rigid bodies and are presumed to narrow the cleft during catalysis. Distinct signature sequences in the nucleotide-binding domain have been linked to NAD(+) vs. NADP(+) specificity, but they are not unambiguous predictors of cofactor preferences. Here, we have determined the crystal structure of NAD(+)-specific Peptoniphilus asaccharolyticus glutamate dehydrogenase in the apo state. The poor quality of native crystals was resolved by derivatization with selenomethionine, and the structure was solved by single-wavelength anomalous diffraction methods. The structure reveals an open catalytic cleft in the absence of substrate and cofactor. Modeling of NAD(+) in Domain II suggests that a hydrophobic pocket and polar residues contribute to nucleotide specificity. Mutagenesis and isothermal titration calorimetry studies of a critical glutamate at the P7 position of the core fingerprint confirms its role in NAD(+) binding. Finally, the cofactor binding site is compared with bacterial and mammalian enzymes to understand how the amino acid sequences and three-dimensional structures may distinguish between NAD(+) vs. NADP(+) recognition.