4LEO

Crystal structure of anti-HER3 Fab RG7116 in complex with the extracellular domains of human Her3 (ERBB3)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.64 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

wwPDB Validation   3D Report Full Report



Literature

RG7116, a Therapeutic Antibody That Binds the Inactive HER3 Receptor and Is Optimized for Immune Effector Activation.

Mirschberger, C.Schiller, C.B.Schraml, M.Dimoudis, N.Friess, T.Gerdes, C.A.Reiff, U.Lifke, V.Hoelzlwimmer, G.Kolm, I.Hopfner, K.P.Niederfellner, G.Bossenmaier, B.

(2013) Cancer Res 73: 5183-5194

  • DOI: 10.1158/0008-5472.CAN-13-0099
  • Primary Citation of Related Structures:  
    4LEO

  • PubMed Abstract: 
  • The EGF receptor (EGFR) HER3 is emerging as an attractive cancer therapeutic target due to its central position in the HER receptor signaling network. HER3 amplifies phosphoinositide 3-kinase (PI3K)-driven tumorigenesis and its upregulation in respon ...

    The EGF receptor (EGFR) HER3 is emerging as an attractive cancer therapeutic target due to its central position in the HER receptor signaling network. HER3 amplifies phosphoinositide 3-kinase (PI3K)-driven tumorigenesis and its upregulation in response to other anti-HER therapies has been implicated in resistance to them. Here, we report the development and characterization of RG7116, a novel anti-HER3 monoclonal antibody (mAb) designed to block HER3 activation, downregulate HER3, and mediate enhanced antibody-dependent cell-mediated cytotoxicity (ADCC) via glycoengineering of the Fc moiety. Biochemical studies and X-ray crystallography revealed that RG7116 bound potently and selectively to domain 1 of human HER3. Heregulin binding was prevented by RG7116 at concentrations more than 1 nmol/L as was nearly complete inhibition of HER3 heterodimerization and phosphorylation, thereby preventing downstream AKT phosphorylation. In vivo RG7116 treatment inhibited xenograft tumor growth up to 90% relative to controls in a manner accompanied by downregulation of cell surface HER3. RG7116 efficacy was further enhanced in combination with anti-EGFR (RG7160) or anti-HER2 (pertuzumab) mAbs. Furthermore, the ADCC potency of RG7116 was enhanced compared with the nonglycoengineered parental antibody, both in vitro and in orthotopic tumor xenograft models, where an increased median survival was documented. ADCC degree achieved in vitro correlated with HER3 expression levels on tumor cells. In summary, the combination of strong signaling inhibition and enhanced ADCC capability rendered RG7116 a highly potent HER3-targeting agent suitable for clinical development.


    Organizational Affiliation

    Pharma Research and Early Development (pRED), Roche Diagnostics GmbH, Penzberg, Germany. brigit.bossenmaier@roche.com



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RG7116 Fab heavy chainA227Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
RG7116 Fab light chainB220Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Receptor tyrosine-protein kinase erbB-3C621Homo sapiensMutation(s): 0 
Gene Names: ERBB3HER3
EC: 2.7.10.1
Find proteins for P21860 (Homo sapiens)
Explore P21860 
Go to UniProtKB:  P21860
NIH Common Fund Data Resources
PHAROS  P21860
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
C
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.64 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.458α = 97.64
b = 59.359β = 106.85
c = 103.661γ = 96.83
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-10
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Advisory, Refinement description
  • Version 1.3: 2018-01-24
    Changes: Structure summary
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary