1LS3

Crystal Structure of the Complex between Rabbit Cytosolic Serine Hydroxymethyltransferase and TriGlu-5-formyl-tetrahydrofolate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Location of the Pteroylpolyglutamate Binding Site on Rabbit Cytosolic Serine Hydroxymethyltransferase

Fu, T.F.Scarsdale, J.N.Kazanina, G.Schirch, V.Wright, H.T.

(2003) J.Biol.Chem. 278: 2645-2653

  • DOI: 10.1074/jbc.M210649200

  • PubMed Abstract: 
  • Serine hydroxymethyltransferase (SHMT; EC 2.1.2.1) catalyzes the reversible interconversion of serine and glycine with transfer of the serine side chain one-carbon group to tetrahydropteroylglutamate (H(4)PteGlu), and also the conversion of 5,10-meth ...

    Serine hydroxymethyltransferase (SHMT; EC 2.1.2.1) catalyzes the reversible interconversion of serine and glycine with transfer of the serine side chain one-carbon group to tetrahydropteroylglutamate (H(4)PteGlu), and also the conversion of 5,10-methenyl-H(4)PteGlu to 5-formyl-H(4)PteGlu. In the cell, H(4)PteGlu carries a poly-gamma-glutamyl tail of at least 3 glutamyl residues that is required for physiological activity. This study combines solution binding and mutagenesis studies with crystallographic structure determination to identify the extended binding site for tetrahydropteroylpolyglutamate on rabbit cytosolic SHMT. Equilibrium binding and kinetic measurements of H(4)PteGlu(3) and H(4)PteGlu(5) with wild-type and Lys --> Gln or Glu site mutant homotetrameric rabbit cytosolic SHMTs identified lysine residues that contribute to the binding of the polyglutamate tail. The crystal structure of the enzyme in complex with 5-formyl-H(4)PteGlu(3) confirms the solution data and indicates that the conformation of the pteridine ring and its interactions with the enzyme differ slightly from those observed in complexes of the monoglutamate cofactor. The polyglutamate chain, which does not contribute to catalysis, exists in multiple conformations in each of the two occupied binding sites and appears to be bound by the electrostatic field created by the cationic residues, with only limited interactions with specific individual residues.


    Organizational Affiliation

    Department of Biochemistry and the Institute for Structural Biology and Drug Discovery, Virginia Commonwealth University, Richmond 23219-1570, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine Hydroxymethyltransferase
A, B, C, D
483Oryctolagus cuniculusGene Names: SHMT1
EC: 2.1.2.1
Find proteins for P07511 (Oryctolagus cuniculus)
Go to Gene View: SHMT1
Go to UniProtKB:  P07511
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GLY
Query on GLY

Download SDF File 
Download CCD File 
A, C
GLYCINE
C2 H5 N O2
DHMQDGOQFOQNFH-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
B, C, D
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
PLP
Query on PLP

Download SDF File 
Download CCD File 
A, B, C, D
PYRIDOXAL-5'-PHOSPHATE
VITAMIN B6 Phosphate
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
TGF
Query on TGF

Download SDF File 
Download CCD File 
B, D
2-[4-(4-{4-[(2-AMINO-5-FORMYL-4-OXO-3,4,5,6,7,8-HEXAHYDRO-PTERIDIN-6-YLMETHYL)-AMINO]-BENZOYLAMINO}-4-CARBOXY-BUTYRYLAMINO)-4-CARBOXY-BUTYRYLAMINO]-PENTANEDIOIC ACID
TRIGLU-5-FORMYL-TETRAHYDROFOLATE
C30 H37 N9 O13
ZLOMJLIQXBKNHU-VJANTYMQSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.294 
  • R-Value Work: 0.220 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 114.084α = 90.00
b = 114.084β = 90.00
c = 156.719γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Non-polymer description, Version format compliance
  • Version 1.3: 2013-08-21
    Type: Non-polymer description