1TC1

A 1.4 ANGSTROM CRYSTAL STRUCTURE FOR THE HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE OF TRYPANOSOMA CRUZI

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.41 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history. 

Literature

A 1.4 A crystal structure for the hypoxanthine phosphoribosyltransferase of Trypanosoma cruzi.

Focia, P.J., Craig III, S.P., Nieves-Alicea, R., Fletterick, R.J., Eakin, A.E.

(1998) Biochemistry 37: 15066-15075

  • DOI: 10.1021/bi981052s

  • PubMed Abstract: 

    • The hypoxanthine phosphoribosyltransferase (HPRT) from Trypanosoma cruzi, etiologic agent of Chagas' disease, was cocrystallized with the inosine analogue Formycin B (FmB) and the structure determined to 1.4 A resolution. This is the highest resoluti ...

    The hypoxanthine phosphoribosyltransferase (HPRT) from Trypanosoma cruzi, etiologic agent of Chagas' disease, was cocrystallized with the inosine analogue Formycin B (FmB) and the structure determined to 1.4 A resolution. This is the highest resolution structure yet reported for a phosphoribosyltransferase (PRT), and the asymmetric unit of the crystal contains a dimer of closely associated, nearly identical subunits. A conserved nonproline cis peptide in one active-site loop exposes the main-chain nitrogen to the enzyme active site, while the adjacent lysine side chain interacts with the other subunit of the dimer, thereby providing a possible mechanism for communication between the subunits and their active sites. The three-dimensional coordinates for the invariant Ser103-Tyr104 dipeptide are reported here for the first time. These are the only highly conserved residues in a second active-site loop, termed the long flexible loop, which is predicted to close over the active site of HPRTs to protect a labile transition state [Eads et al. (1994) Cell 78, 325-334]. This structure represents a major step forward in efforts to design/discover potent selective inhibitors of the HPRT of T. cruzi.

    Organizational Affiliation: 

    Laboratory of Molecular Parasitology & Drug Design, School of Pharmacy, University of North Carolina, Chapel Hill 27599-7360, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE)
A, B
220Trypanosoma cruzi (strain CL Brener)Mutation(s): 0 
EC: 2.4.2.8
Find proteins for Q4DRC4 (Trypanosoma cruzi (strain CL Brener))
Go to UniProtKB:  Q4DRC4
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMB
Query on FMB
Download SDF File 
Download CCD File 
A, B
FORMYCIN B
C10 H12 N4 O5
MTCJZZBQNCXKAP-KSYZLYKTSA-N
 Ligand Interaction
MES
Query on MES
Download SDF File 
Download CCD File 
A, B
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
FMBIC50: >2000000 nM BINDINGMOAD
FMBIC50: >2000000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.41 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 39.500α = 90.00
b = 94.090β = 94.75
c = 52.120γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
AMoREphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-10-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-24
    Type: Database references
  • Version 1.4: 2018-01-31
    Type: Database references