6DDR

Crystal Structure Analysis of the Epitope of an Anti-MICA Antibody

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

High-resolution glycosylation site-engineering method identifies MICA epitope critical for shedding inhibition activity of anti-MICA antibodies.

Lombana, T.N., Matsumoto, M.L., Berkley, A.M., Toy, E., Cook, R., Gan, Y., Du, C., Schnier, P., Sandoval, W., Ye, Z., Schartner, J.M., Kim, J., Spiess, C.

(2019) MAbs 11: 75-93

  • DOI: 10.1080/19420862.2018.1532767
  • Structures With Same Primary Citation

  • PubMed Abstract: 

    • As an immune evasion strategy, MICA and MICB, the major histocompatibility complex class I homologs, are proteolytically cleaved from the surface of cancer cells leading to impairment of CD8 + T cell- and natural killer cell-mediated immune responses ...

    As an immune evasion strategy, MICA and MICB, the major histocompatibility complex class I homologs, are proteolytically cleaved from the surface of cancer cells leading to impairment of CD8 + T cell- and natural killer cell-mediated immune responses. Antibodies that inhibit MICA/B shedding from tumors have therapeutic potential, but the optimal epitopes are unknown. Therefore, we developed a high-resolution, high-throughput glycosylation-engineered epitope mapping (GEM) method, which utilizes site-specific insertion of N-linked glycans onto the antigen surface to mask local regions. We apply GEM to the discovery of epitopes important for shedding inhibition of MICA/B and validate the epitopes at the residue level by alanine scanning and X-ray crystallography (Protein Data Bank accession numbers 6DDM (1D5 Fab-MICA*008), 6DDR (13A9 Fab-MICA*008), 6DDV (6E1 Fab-MICA*008). Furthermore, we show that potent inhibition of MICA shedding can be achieved by antibodies that bind GEM epitopes adjacent to previously reported cleavage sites, and that these anti-MICA/B antibodies can prevent tumor growth in vivo.

    Organizational Affiliation: 

    a Department of Antibody Engineering , Genentech Inc ., South San Francisco , USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Anti-MICA Fab fragment light chain clone 13A9A214Mus musculusMutation(s): 0 
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Anti-MICA Fab fragment heavy chain clone 13A9B221Mus musculusMutation(s): 0 
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
MHC class I polypeptide-related sequence AC94Homo sapiensMutation(s): 0 
Gene Names: MICA, hCG_2001511
Find proteins for Q96QC4 (Homo sapiens)
Explore Q96QC4 
Go to UniProtKB:  Q96QC4
NIH Common Fund Data Resources
GTEx  ENSG00000204520
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
GOL
Query on GOL
Download CCD File 
A, B, C
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
ZN
Query on ZN
Download CCD File 
C
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.549α = 90
b = 61.833β = 90
c = 172.368γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHENIXphasing

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2018-05-10 
  • Released Date: 2018-10-24 
    • Deposition Author(s): Matsumoto, M.L.

Revision History 

  • Version 1.0: 2018-10-24
    Type: Initial release
  • Version 1.1: 2018-12-05
    Changes: Data collection, Database references
  • Version 1.2: 2019-01-23
    Changes: Data collection, Database references