6I04

Crystal structure of Sema domain of the Met receptor in complex with FAB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

MM-131, a bispecific anti-Met/EpCAM mAb, inhibits HGF-dependent and HGF-independent Met signaling through concurrent binding to EpCAM.

Casaletto, J.B.Geddie, M.L.Abu-Yousif, A.O.Masson, K.Fulgham, A.Boudot, A.Maiwald, T.Kearns, J.D.Kohli, N.Su, S.Razlog, M.Raue, A.Kalra, A.Hakansson, M.Logan, D.T.Welin, M.Chattopadhyay, S.Harms, B.D.Nielsen, U.B.Schoeberl, B.Lugovskoy, A.A.MacBeath, G.

(2019) Proc.Natl.Acad.Sci.USA 116: 7533-7542

  • DOI: 10.1073/pnas.1819085116
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Activation of the Met receptor tyrosine kinase, either by its ligand, hepatocyte growth factor (HGF), or via ligand-independent mechanisms, such as <i>MET </i> amplification or receptor overexpression, has been implicated in driving tumor proliferat ...

    Activation of the Met receptor tyrosine kinase, either by its ligand, hepatocyte growth factor (HGF), or via ligand-independent mechanisms, such as MET amplification or receptor overexpression, has been implicated in driving tumor proliferation, metastasis, and resistance to therapy. Clinical development of Met-targeted antibodies has been challenging, however, as bivalent antibodies exhibit agonistic properties, whereas monovalent antibodies lack potency and the capacity to down-regulate Met. Through computational modeling, we found that the potency of a monovalent antibody targeting Met could be dramatically improved by introducing a second binding site that recognizes an unrelated, highly expressed antigen on the tumor cell surface. Guided by this prediction, we engineered MM-131, a bispecific antibody that is monovalent for both Met and epithelial cell adhesion molecule (EpCAM). MM-131 is a purely antagonistic antibody that blocks ligand-dependent and ligand-independent Met signaling by inhibiting HGF binding to Met and inducing receptor down-regulation. Together, these mechanisms lead to inhibition of proliferation in Met-driven cancer cells, inhibition of HGF-mediated cancer cell migration, and inhibition of tumor growth in HGF-dependent and -independent mouse xenograft models. Consistent with its design, MM-131 is more potent in EpCAM-high cells than in EpCAM-low cells, and its potency decreases when EpCAM levels are reduced by RNAi. Evaluation of Met, EpCAM, and HGF levels in human tumor samples reveals that EpCAM is expressed at high levels in a wide range of Met-positive tumor types, suggesting a broad opportunity for clinical development of MM-131.


    Organizational Affiliation

    Discovery Division, Merrimack Pharmaceuticals, Inc., Cambridge, MA 02139.,SARomics Biostructures AB, Medicon Village, SE-223 81 Lund, Sweden.,Discovery Division, Merrimack Pharmaceuticals, Inc., Cambridge, MA 02139; araue@merrimack.com gavin.macbeath@gmail.com.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hepatocyte growth factor receptor
A, B
552Homo sapiensMutation(s): 0 
Gene Names: MET
EC: 2.7.10.1
Find proteins for P08581 (Homo sapiens)
Go to Gene View: MET
Go to UniProtKB:  P08581
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab heavy chain
H, C
230N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Fab light chain
L, D
214N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.202 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 73.932α = 77.49
b = 85.497β = 88.58
c = 101.300γ = 68.76
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2019-03-13
    Type: Initial release
  • Version 1.1: 2019-04-03
    Type: Data collection, Database references
  • Version 1.2: 2019-04-24
    Type: Data collection, Database references