3I9G

Crystal structure of the LT1009 (SONEPCIZUMAB) antibody Fab fragment in complex with sphingosine-1-phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The crystal structure of sphingosine-1-phosphate in complex with a Fab fragment reveals metal bridging of an antibody and its antigen.

Wojciak, J.M.Zhu, N.Schuerenberg, K.T.Moreno, K.Shestowsky, W.S.Hiraiwa, M.Sabbadini, R.Huxford, T.

(2009) Proc.Natl.Acad.Sci.USA 106: 17717-17722

  • DOI: 10.1073/pnas.0906153106

  • PubMed Abstract: 
  • The pleiotropic signaling lipid sphingosine-1-phosphate (S1P) plays significant roles in angiogenesis, heart disease, and cancer. LT1009 (also known as sonepcizumab) is a humanized monoclonal antibody that binds S1P with high affinity and specificity ...

    The pleiotropic signaling lipid sphingosine-1-phosphate (S1P) plays significant roles in angiogenesis, heart disease, and cancer. LT1009 (also known as sonepcizumab) is a humanized monoclonal antibody that binds S1P with high affinity and specificity. Because the antibody is currently in clinical trials, it is important to confirm by structural and biochemical analyses that it binds its target in a predictable manner. Therefore, we determined the structure of a complex between the LT1009 antibody Fab fragment and S1P refined to 1.90 A resolution. The antibody employs unique and diverse strategies to recognize its antigen. Two metal ions bridge complementarity determining regions from the antibody light chain and S1P. The coordination geometry, inductively coupled plasma spectroscopy, surface plasmon resonance spectroscopy, and biochemical assays suggest that these are Ca(2+). The amino alcohol head group of the sphingosine backbone is recognized through hydrogen bonding interactions from 1 aa side chain and polypeptide backbone atoms of the antibody light and heavy chains. The S1P hydrophobic tail is almost completely enclosed within a hydrophobic channel formed primarily by the heavy chain. Both treatment of the complex with metal chelators and mutation of amino acids in the light chain that coordinate the metal atoms or directly contact the polar head group abrogate binding, while mutations within the hydrophobic cavity also decrease S1P binding affinity. The structure suggests mechanistic details for recognition of a signaling lipid by a therapeutic antibody candidate. Moreover, this study provides direct structural evidence that antibodies are capable of using metals to bridge antigen:antibody complexes.


    Related Citations: 
    • Production and characterization of monoclonal anti-sphingosine-1-phosphate antibodies
      O'Brien, N.,Jones, S.T.,Williams, D.G.,Cunningham, H.B.,Moreno, K.,Visentin, B.,Gentile, A.,Vekich, J.,Shestowsky, W.,Hiraiwa, M.,Matteo, R.,Cavalli, A.,Grotjahn, D.,Grant, M.,Hansen, G.,Campbell, M.A.,Sabbadini, R.
      (2009) J.Lipid Res. --: --


    Organizational Affiliation

    Lpath Inc., 6335 Ferris Square, Suite A, San Diego, CA 92121, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sonepcizumab antibody Fab fragment, heavy chain
H
222N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Sonepcizumab antibody Fab fragment, light chain
L
213N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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Download CCD File 
L
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
S1P
Query on S1P

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Download CCD File 
L
(2S,3R,4E)-2-amino-3-hydroxyoctadec-4-en-1-yl dihydrogen phosphate
sphingosine 1-phosphate
C18 H38 N O5 P
DUYSYHSSBDVJSM-KRWOKUGFSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
S1PKd: 1.1 nM BINDINGMOAD
S1PKd: 1.1 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 66.052α = 90.00
b = 70.889β = 90.00
c = 138.719γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
HKL-2000data collection
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2009-07-10 
  • Released Date: 2009-09-29 
  • Deposition Author(s): Huxford, T.

Revision History 

  • Version 1.0: 2009-09-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance