4CXM

Crystal Structure of Plasmodium Falciparum Spermidine Synthase in Complex with METHYLTHIOADENOSIN AND SPERMIDINE after catalysis in crystal


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Three-Dimensional Structures of Plasmodium Falciparum Spermidine Synthase with Bound Inhibitors Suggest New Strategies for Drug Design.

Sprenger, J.Svensson, B.Halander, J.Carey, J.Persson, L.Al-Karadaghi, S.

(2015) Acta Crystallogr.,Sect.D 71: 484

  • DOI: 10.1107/S1399004714027011
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The enzymes of the polyamine-biosynthesis pathway have been proposed to be promising drug targets in the treatment of malaria. Spermidine synthase (SpdS; putrescine aminopropyltransferase) catalyzes the transfer of the aminopropyl moiety from decarbo ...

    The enzymes of the polyamine-biosynthesis pathway have been proposed to be promising drug targets in the treatment of malaria. Spermidine synthase (SpdS; putrescine aminopropyltransferase) catalyzes the transfer of the aminopropyl moiety from decarboxylated S-adenosylmethionine to putrescine, leading to the formation of spermidine and 5'-methylthioadenosine (MTA). In this work, X-ray crystallography was used to examine ligand complexes of SpdS from the malaria parasite Plasmodium falciparum (PfSpdS). Five crystal structures were determined of PfSpdS in complex with MTA and the substrate putrescine, with MTA and spermidine, which was obtained as a result of the enzymatic reaction taking place within the crystals, with dcAdoMet and the inhibitor 4-methylaniline, with MTA and 4-aminomethylaniline, and with a compound predicted in earlier in silico screening to bind to the active site of the enzyme, benzimidazol-(2-yl)pentan-1-amine (BIPA). In contrast to the other inhibitors tested, the complex with BIPA was obtained without any ligand bound to the dcAdoMet-binding site of the enzyme. The complexes with the aniline compounds and BIPA revealed a new mode of ligand binding to PfSpdS. The observed binding mode of the ligands, and the interplay between the two substrate-binding sites and the flexible gatekeeper loop, can be used in the design of new approaches in the search for new inhibitors of SpdS.


    Organizational Affiliation

    Department of Experimental Medical Science, Lund University, SE-221 84 Lund, Sweden.,Chemistry Department, Princeton University, Princeton, New Jersey, USA.,Center for Molecular Protein Science, Lund University, SE-221 00 Lund, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SPERMIDINE SYNTHASE
A, B, C
283Plasmodium falciparum (isolate 3D7)Mutation(s): 0 
EC: 2.5.1.16
Find proteins for Q8II73 (Plasmodium falciparum (isolate 3D7))
Go to UniProtKB:  Q8II73
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MTA
Query on MTA

Download SDF File 
Download CCD File 
A, B, C
5'-DEOXY-5'-METHYLTHIOADENOSINE
C11 H15 N5 O3 S
WUUGFSXJNOTRMR-IOSLPCCCSA-N
 Ligand Interaction
SPD
Query on SPD

Download SDF File 
Download CCD File 
A, B, C
SPERMIDINE
N-(2-AMINO-PROPYL)-1,4-DIAMINOBUTANE; PA(34)
C7 H19 N3
ATHGHQPFGPMSJY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.179 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 197.900α = 90.00
b = 134.400β = 95.50
c = 48.300γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-08
    Type: Initial release
  • Version 1.1: 2015-01-14
    Type: Database references
  • Version 1.2: 2015-03-11
    Type: Database references
  • Version 1.3: 2015-03-25
    Type: Database references
  • Version 1.4: 2018-01-17
    Type: Data collection