4O6Z

Crystal structure of serine hydroxymethyltransferase with covalently bound PLP Schiff-base from Plasmodium falciparum

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.228 

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Literature

The structure of Plasmodium falciparum serine hydroxymethyltransferase reveals a novel redox switch that regulates its activities.

Chitnumsub, P., Ittarat, W., Jaruwat, A., Noytanom, K., Amornwatcharapong, W., Pornthanakasem, W., Chaiyen, P., Yuthavong, Y., Leartsakulpanich, U.

(2014) Acta Crystallogr D Biol Crystallogr 70: 1517-1527

  • DOI: 10.1107/S1399004714005598
  • Primary Citation of Related Structures:  
    4O6Z

  • PubMed Abstract: 

    • Plasmodium falciparum serine hydroxymethyltransferase (PfSHMT), an enzyme in the dTMP synthesis cycle, is an antimalarial target because inhibition of its expression or function has been shown to be lethal to the parasite. As the wild-type enzyme could not be crystallized, protein engineering of residues on the surface was carried out ...

    Plasmodium falciparum serine hydroxymethyltransferase (PfSHMT), an enzyme in the dTMP synthesis cycle, is an antimalarial target because inhibition of its expression or function has been shown to be lethal to the parasite. As the wild-type enzyme could not be crystallized, protein engineering of residues on the surface was carried out. The surface-engineered mutant PfSHMT-F292E was successfully crystallized and its structure was determined at 3 Å resolution. The PfSHMT-F292E structure is a good representation of PfSHMT as this variant revealed biochemical properties similar to those of the wild type. Although the overall structure of PfSHMT is similar to those of other SHMTs, unique features including the presence of two loops and a distinctive cysteine pair formed by Cys125 and Cys364 in the tetrahydrofolate (THF) substrate binding pocket were identified. These structural characteristics have never been reported in other SHMTs. Biochemical characterization and mutation analysis of these two residues confirm that they act as a disulfide/sulfhydryl switch to regulate the THF-dependent catalytic function of the enzyme. This redox switch is not present in the human enzyme, in which the cysteine pair is absent. The data reported here can be further exploited as a new strategy to specifically disrupt the activity of the parasite enzyme without interfering with the function of the human enzyme.

    Organizational Affiliation: 

    National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine hydroxymethyltransferaseA, B, C, D480Plasmodium falciparum 3D7Mutation(s): 1 
Gene Names: PFL1720w, SHMT1, SHMT, PF3D7_1235600
EC: 2.1.2.1
UniProt
Find proteins for Q8I566 (Plasmodium falciparum (isolate 3D7))
Explore Q8I566 
Go to UniProtKB:  Q8I566
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8I566
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP
Download Ideal Coordinates CCD File 
E [auth A],
F [auth B],
G [auth C]		PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N		 Ligand Interaction
PO4
Query on PO4
Download Ideal Coordinates CCD File 
H [auth D]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.98 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.228 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 254.947α = 90
b = 254.947β = 90
c = 61.399γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
AMoREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-06-11
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Database references, Derived calculations