6A76

Crystal structure of the Fab fragment of B5209B, a murine monoclonal antibody specific for the fifth immunoglobulin domain (Ig5) of human ROBO1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.129 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Affinity Improvement of a Cancer-Targeted Antibody through Alanine-Induced Adjustment of Antigen-Antibody Interface.

Yamashita, T.Mizohata, E.Nagatoishi, S.Watanabe, T.Nakakido, M.Iwanari, H.Mochizuki, Y.Nakayama, T.Kado, Y.Yokota, Y.Matsumura, H.Kawamura, T.Kodama, T.Hamakubo, T.Inoue, T.Fujitani, H.Tsumoto, K.

(2018) Structure --: --

  • DOI: 10.1016/j.str.2018.11.002
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • To investigate favorable single amino acid substitutions that improve antigen-antibody interactions, alanine (Ala) mutagenesis scanning of the interfacial residues of a cancer-targeted antibody, B5209B, was performed based on X-ray crystallography an ...

    To investigate favorable single amino acid substitutions that improve antigen-antibody interactions, alanine (Ala) mutagenesis scanning of the interfacial residues of a cancer-targeted antibody, B5209B, was performed based on X-ray crystallography analysis. Two substitutions were shown to significantly enhance the binding affinity for the antigen, by up to 30-fold. One substitution improved the affinity by a gain of binding enthalpy, whereas the other substitution improved the affinity by a gain of binding entropy. Molecular dynamics simulations showed that the enthalpic improvement could be attributed to the stabilization of distant salt bridges located at the periphery of the antigen-antibody interface. The entropic improvement was due to the release of water molecules that were stably trapped in the antigen-antibody interface of the wild-type antibody. Importantly, these effects of the Ala substitutions were caused by subtle adjustments of the binding interface. These results will be helpful to design high-affinity antibodies with avoiding entropy-enthalpy compensation.


    Organizational Affiliation

    Laboratory for Systems Biology and Medicine, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1, Komaba, Meguro-ku, Tokyo 153-8904, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Light chain of the anti-human Robo1 antibody B5209B Fab
L
211N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Heavy chain of the anti-human Robo1 antibody B5209B Fab
H
221N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
H
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
H, L
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.129 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 42.431α = 90.00
b = 83.947β = 90.00
c = 129.498γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
REFMACrefinement
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Council for Science and Technology PolicyJapanFirst Program-MDADD

Revision History 

  • Version 1.0: 2019-01-30
    Type: Initial release