title: Crystal structure of the NAD complex of human deoxyhypusine synthase: an enzyme with a ball-and-chain mechanism for blocking the active site.
abstract: BACKGROUND
  Eukaryotic initiation factor 5A (elF-5A) contains an unusual amino acid, hypusine [N epsilon-(4-aminobutyl-2-hydroxy)lysine]. The first step in the post-translational formation of hypusine is catalysed by the enzyme deoxyhypusine synthase (DHS). The modified version of elF-5A, and DHS, are required for eukaryotic cell proliferation. Knowledge of the three-dimensional structure of this key enzyme should permit the design of specific inhibitors that may be useful as anti-proliferative agents.
  
  
  RESULTS
  The crystal structure of human DHS with bound NAD cofactor has been determined and refined at 2.2 A resolution. The enzyme is a tetramer of four identical subunits arranged with 222 symmetry; each subunit contains a nucleotide-binding (or Rossmann) fold. The tetramer comprises two tightly associated dimers and contains four active sites, two in each dimer interface. The catalytic portion of each active site is located in one subunit while the NAD-binding site is located in the other. The entrance to the active-site cavity is blocked by a two-turn alpha helix, part of a third subunit, to which it is joined by an extended loop.
  
  
  CONCLUSIONS
  The active site of DHS is a cavity buried below the surface of the enzyme at the interface between two subunits. In the conformation observed here, the substrate-binding site is inaccessible and we propose that the reaction steps carried out by the enzyme must be accompanied by significant conformational changes, the least of which would be the displacement of the two-turn alpha helix.
authors.affiliation: Laboratory of Molecular Biology, NIDDK, NIH, Bethesda, MD 20892-0560, USA.
authors.forename: D I
authors.initials: DI
authors.lastname: Liao
authors.forename: E C
authors.initials: EC
authors.lastname: Wolff
authors.forename: M H
authors.initials: MH
authors.lastname: Park
authors.forename: D R
authors.initials: DR
authors.lastname: Davies
mesh_terms: D001665:Binding Sites / Q000502:physiology; D018360:Crystallography, X-Ray; D006801:Humans; D006860:Hydrogen Bonding; D008239:Lysine / Q000031:analogs & derivatives / Q000096:biosynthesis / Q000378:metabolism; D008958:Models, Molecular; D009243:NAD / Q000737:chemistry*; D000587:Oxidoreductases Acting on CH-NH Group Donors / Q000737:chemistry* / Q000502:physiology; D010448:Peptide Initiation Factors / Q000737:chemistry; D011487:Protein Conformation; D011499:Protein Processing, Post-Translational / Q000502:physiology; D017433:Protein Structure, Secondary; D011994:Recombinant Proteins / Q000737:chemistry; D013095:Spermidine / Q000378:metabolism
chemical_list: D010448:Peptide Initiation Factors; D011994:Recombinant Proteins; D009243:NAD; C034924:deoxyhypusine; D000587:Oxidoreductases Acting on CH-NH Group Donors; C063507:deoxyhypusine synthase; D008239:Lysine; D013095:Spermidine