1EZR

CRYSTAL STRUCTURE OF NUCLEOSIDE HYDROLASE FROM LEISHMANIA MAJOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

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This is version 1.3 of the entry. See complete history


Literature

Nucleoside hydrolase from Leishmania major. Cloning, expression, catalytic properties, transition state inhibitors, and the 2.5-a crystal structure.

Shi, W.Schramm, V.L.Almo, S.C.

(1999) J Biol Chem 274: 21114-21120

  • DOI: 10.1074/jbc.274.30.21114
  • Primary Citation of Related Structures:  
    1EZR

  • PubMed Abstract: 
  • Protozoan parasites lack the pathway of the de novo synthesis of purines and depend on host-derived nucleosides and nucleotides to salvage purines for DNA and RNA synthesis. Nucleoside hydrolase is a central enzyme in the purine salvage pathway and represents a prime target for the development of anti-parasitic drugs ...

    Protozoan parasites lack the pathway of the de novo synthesis of purines and depend on host-derived nucleosides and nucleotides to salvage purines for DNA and RNA synthesis. Nucleoside hydrolase is a central enzyme in the purine salvage pathway and represents a prime target for the development of anti-parasitic drugs. The full-length cDNA for nucleoside hydrolase from Leishmania major was cloned and sequence analysis revealed that the L. major nucleoside hydrolase shares 78% sequence identity with the nonspecific nucleoside hydrolase from Crithidia fasciculata. The L. major enzyme was overexpressed in Escherichia coli and purified to over 95% homogeneity. The L. major nucleoside hydrolase was identified as a nonspecific nucleoside hydrolase since it demonstrates the characteristics: 1) efficient utilization of p-nitrophenyl beta-D-ribofuranoside as a substrate; 2) recognition of both inosine and uridine nucleosides as favored substrates; and 3) significant activity with all of the naturally occurring purine and pyrimidine nucleosides. The crystal structure of the L. major nucleoside hydrolase revealed a bound Ca(2+) ion in the active site with five oxygen ligands from Asp-10, Asp-15 (bidentate), Thr-126 (carbonyl), and Asp-241. The structure is similar to the C. fasciculata IU-nucleoside hydrolase apoenzyme. Despite the similarities, the catalytic specificities differ substantially. Relative values of k(cat) for the L. major enzyme with inosine, adenosine, guanosine, uridine, and cytidine as substrates are 100, 0.5, 0.5, 27 and 0.3; while those for the enzyme from C. fasciculata are 100, 15, 14, 510, and 36 for the same substrates. Iminoribitol analogues of the transition state are nanomolar inhibitors. The results provide new information for purine and pyrimidine salvage pathways in Leishmania.


    Organizational Affiliation

    Albert Einstein College of Medicine, Department of Biochemistry, Bronx, New York 10461, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NUCLEOSIDE HYDROLASEA, B, C, D314Leishmania majorMutation(s): 0 
Gene Names: NSNH
EC: 3.2.2.1 (PDB Primary Data), 3.2.2.2 (UniProt), 3.2.2.3 (UniProt)
Find proteins for P83851 (Leishmania major)
Explore P83851 
Go to UniProtKB:  P83851
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.8α = 90
b = 79.2β = 91.6
c = 109.8γ = 90
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement
X-GENdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-05-24
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description