1RZY

Crystal structure of rabbit Hint complexed with N-ethylsulfamoyladenosine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Biochemical, crystallographic, and mutagenic characterization of hint, the AMP-lysine hydrolase, with novel substrates and inhibitors

Krakowiak, A.K.Pace, H.C.Blackburn, G.M.Adams, M.Mekhalfia, A.Kaczmarek, R.Baraniak, J.Stec, W.J.Brenner, C.

(2004) J.Biol.Chem. 279: 18711-18716

  • DOI: 10.1074/jbc.M314271200
  • Also Cited By: 3LLJ

  • PubMed Abstract: 
  • Hint, histidine triad nucleotide-binding protein, is a universally conserved enzyme that hydrolyzes AMP linked to lysine and, in yeast, functions as a positive regulator of the RNA polymerase II C-terminal domain kinase, Kin28. To explore the biochem ...

    Hint, histidine triad nucleotide-binding protein, is a universally conserved enzyme that hydrolyzes AMP linked to lysine and, in yeast, functions as a positive regulator of the RNA polymerase II C-terminal domain kinase, Kin28. To explore the biochemical and structural bases for the adenosine phosphoramidate hydrolase activity of rabbit Hint, we synthesized novel substrates linking a p-nitroaniline group to adenylate (AMP-pNA) and inhibitors that consist of an adenosine group and 5'-sulfamoyl (AdoOSO(2)NH(2)) or N-ethylsulfamoyl (AdoOSO(2)NHCH(2)CH(3)) group. AMP-pNA is a suitable substrate for Hint that allowed characterization of the inhibitors; titration of each inhibitor into AMP-pNA assays revealed their K(i) values. The N-ethylsulfamoyl derivative has a 13-fold binding advantage over the sulfamoyl adenosine. The 1.8-A cocrystal structure of rabbit Hint with N-ethylsulfamoyl adenosine revealed a binding site for the ethyl group against Trp-123, a residue that reaches across the Hint dimer interface to interact with the alkyl portion of the inhibitor and, presumably, the alkyl portion of a lysyl substrate. Ser-107 is positioned to donate a hydrogen bond to the leaving group nitrogen. Consistent with a role in acid-base catalysis, the Hint S107A mutant protein displayed depressed catalytic activity.


    Related Citations: 
    • Crystal structures of HINT demonstrate that histidine triad proteins are GalT-related nucleotide-binding proteins
      Brenner, C.,Garrison, P.,Gilmour, J.,Peisach, D.,Ringe, D.,Petsko, G.A.,Lowenstein, J.M.
      (1997) Nat.Struct.Mol.Biol. 4: 231


    Organizational Affiliation

    Structural Biology and Bioinformatics Program, Kimmel Cancer Center, Philadelphia, Pennsylvania 19107, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Histidine triad nucleotide-binding protein 1
A
126Oryctolagus cuniculusMutation(s): 0 
Gene Names: HINT1 (HINT)
EC: 3.-.-.-
Find proteins for P80912 (Oryctolagus cuniculus)
Go to Gene View: HINT1
Go to UniProtKB:  P80912
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
5AS
Query on 5AS

Download SDF File 
Download CCD File 
A
5'-O-(N-ETHYL-SULFAMOYL)ADENOSINE
C12 H18 N6 O6 S
ONCSLXAPOGUODU-WOUKDFQISA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
5ASKi: 1250 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.216 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 39.888α = 90.00
b = 39.888β = 90.00
c = 142.286γ = 90.00
Software Package:
Software NamePurpose
crystaldata collection
d*TREKdata reduction
d*TREKdata scaling
CNSphasing
CNSrefinement
CrystalCleardata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-03-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance