1DFO

CRYSTAL STRUCTURE AT 2.4 ANGSTROM RESOLUTION OF E. COLI SERINE HYDROXYMETHYLTRANSFERASE IN COMPLEX WITH GLYCINE AND 5-FORMYL TETRAHYDROFOLATE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.174 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure at 2.4 A resolution of E. coli serine hydroxymethyltransferase in complex with glycine substrate and 5-formyl tetrahydrofolate.

Scarsdale, J.N.Radaev, S.Kazanina, G.Schirch, V.Wright, H.T.

(2000) J.Mol.Biol. 296: 155-168

  • DOI: 10.1006/jmbi.1999.3453

  • PubMed Abstract: 
  • Serine hydroxymethyltransferase (EC 2.1.2.1), a member of the alpha-class of pyridoxal phosphate enzymes, catalyzes the reversible interconversion of serine and glycine, changing the chemical bonding at the C(alpha)-C(beta) bond of the serine side-ch ...

    Serine hydroxymethyltransferase (EC 2.1.2.1), a member of the alpha-class of pyridoxal phosphate enzymes, catalyzes the reversible interconversion of serine and glycine, changing the chemical bonding at the C(alpha)-C(beta) bond of the serine side-chain mediated by the pyridoxal phosphate cofactor. Scission of the C(alpha)-C(beta) bond of serine substrate produces a glycine product and most likely formaldehyde, which reacts without dissociation with tetrahydropteroylglutamate cofactor. Crystal structures of the human and rabbit cytosolic serine hydroxymethyltransferases (SHMT) confirmed their close similarity in tertiary and dimeric subunit structure to each other and to aspartate aminotransferase, the archetypal alpha-class pyridoxal 5'-phosphate enzyme. We describe here the structure at 2.4 A resolution of Escherichia coli serine hydroxymethyltransferase in ternary complex with glycine and 5-formyl tetrahydropteroylglutamate, refined to an R-factor value of 17.4 % and R(free) value of 19.6 %. This structure reveals the interactions of both cofactors and glycine substrate with the enzyme. Comparison with the E. coli aspartate aminotransferase structure shows the distinctions in sequence and structure which define the folate cofactor binding site in serine hydroxymethyltransferase and the differences in orientation of the amino terminal arm, the evolution of which was necessary for elaboration of the folate binding site. Comparison with the unliganded rabbit cytosolic serine hydroxymethyltransferase structure identifies changes in the conformation of the enzyme, similar to those observed in aspartate aminotransferase, that probably accompany the binding of substrate. The tetrameric quaternary structure of liganded E. coli serine hydroxymethyltransferase also differs in symmetry and relative disposition of the functional tight dimers from that of the unliganded eukaryotic enzymes. SHMT tetramers have surface charge distributions which suggest distinctions in folate binding between eukaryotic and E. coli enzymes. The structure of the E. coli ternary complex provides the basis for a thorough investigation of its mechanism through characterization and structure determination of site mutants.


    Organizational Affiliation

    Department of Biochemistry and Institute for Structural Biology and Drug Discovery, Virginia Commonwealth University, 800 E. Leigh St. Suite 212, Richmond, VA 23219, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SERINE HYDROXYMETHYLTRANSFERASE
A, B, C, D
417Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: glyA
EC: 2.1.2.1
Find proteins for P0A825 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A825
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FFO
Query on FFO

Download SDF File 
Download CCD File 
A, B, C, D
N-[4-({[(6S)-2-amino-5-formyl-4-oxo-3,4,5,6,7,8-hexahydropteridin-6-yl]methyl}amino)benzoyl]-L-glutamic acid
[6S]-5-FORMYL-TETRAHYDROFOLATE; 6S-FOLINIC ACID
C20 H23 N7 O7
VVIAGPKUTFNRDU-STQMWFEESA-N
 Ligand Interaction
PLG
Query on PLG

Download SDF File 
Download CCD File 
A, B, C, D
N-GLYCINE-[3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YL-METHANE]
N-PYRIDOXYL-GLYCINE-5-MONOPHOSPHATE
C10 H15 N2 O7 P
FEVQWBMNLWUBTF-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
FFOKi: 200 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.174 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 77.460α = 90.00
b = 172.240β = 104.12
c = 95.050γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CNSphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-12-10
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance