Crystal structure of the catalytically inactive kinase domain of the human epidermal growth factor receptor 3 (HER3)

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.243 

Starting Model: experimental
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Structural analysis of the catalytically inactive kinase domain of the human EGF receptor 3.

Jura, N.Shan, Y.Cao, X.Shaw, D.E.Kuriyan, J.

(2009) Proc Natl Acad Sci U S A 106: 21608-21613

  • DOI: https://doi.org/10.1073/pnas.0912101106
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The kinase domain of human epidermal growth factor receptor (HER) 3/ErbB3, a member of the EGF receptor (EGFR) family, lacks several residues that are critical for catalysis. Because catalytic activity in EGFR family members is switched on by an allosteric interaction between kinase domains in an asymmetric kinase domain dimer, HER3 might be specialized to serve as an activator of other EGFR family members. We have determined the crystal structure of the HER3 kinase domain and show that it appears to be locked into an inactive conformation that resembles that of EGFR and HER4. Although the crystal structure shows that the HER3 kinase domain binds ATP, we confirm that it is catalytically inactive but can serve as an activator of the EGFR kinase domain. The HER3 kinase domain forms a dimer in the crystal, mediated by hydrophobic contacts between the N-terminal lobes of the kinase domains. This N-lobe dimer closely resembles a dimer formed by inactive HER4 kinase domains in crystal structures determined previously, and molecular dynamics simulations suggest that the HER3 and HER4 N-lobe dimers are stable. The kinase domains of HER3 and HER4 form similar chains in their respective crystal lattices, in which N-lobe dimers are linked together by reciprocal exchange of C-terminal tails. The conservation of this tiling pattern in HER3 and HER4, which is the closest evolutionary homolog of HER3, might represent a general mechanism by which this branch of the HER receptors restricts ligand-independent formation of active heterodimers with other members of the EGFR family.

  • Organizational Affiliation

    Department of Molecular and Cell Biology, California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Receptor tyrosine-protein kinase erbB-3
A, B
325Homo sapiensMutation(s): 0 
Gene Names: ERBB3ErbB3/HER3HER3
UniProt & NIH Common Fund Data Resources
Find proteins for P21860 (Homo sapiens)
Explore P21860 
Go to UniProtKB:  P21860
GTEx:  ENSG00000065361 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21860
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.80 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.243 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 194.164α = 90
b = 47.637β = 108.04
c = 81.281γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data collection

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description
  • Version 1.3: 2024-02-21
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-04-03
    Changes: Refinement description