4RIX

Crystal structure of an EGFR/HER3 kinase domain heterodimer containing the cancer-associated HER3-Q790R mutation

Summary for 4RIX

• Entry DOI: 10.2210/pdb4rix/pdb
• Related: 4RIW 4RIY
• Descriptor: Receptor tyrosine-protein kinase erbB-3, Epidermal growth factor receptor, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, ... (5 entities in total)
• Functional Keywords: receptor tyrosine kinase, pseudokinase, kinase, atp binding, membrane, transferase
• Biological source: Homo sapiens (human); More
• Cellular location: Isoform 1: Cell membrane; Single-pass type I membrane protein. Isoform 2: Secreted: P21860; Cell membrane; Single-pass type I membrane protein. Isoform 2: Secreted: P00533
• Total number of polymer chains: 4
• Total formula weight: 153336.88

Authors

Littlefield, P.,Liu, L.,Jura, N. (deposition date: 2014-10-07, release date: 2014-12-10, Last modification date: 2023-09-20)

Primary citation

Littlefield, P.,Liu, L.,Mysore, V.,Shan, Y.,Shaw, D.E.,Jura, N.
Structural analysis of the EGFR/HER3 heterodimer reveals the molecular basis for activating HER3 mutations.
Sci.Signal., 7:ra114-ra114, 2014

PubMed Abstract: The human epidermal growth factor receptor (HER) tyrosine kinases homo- and heterodimerize to activate downstream signaling pathways. HER3 is a catalytically impaired member of the HER family that contributes to the development of several human malignancies and is mutated in a subset of cancers. HER3 signaling depends on heterodimerization with a catalytically active partner, in particular epidermal growth factor receptor (EGFR) (the founding family member, also known as HER1) or HER2. The activity of homodimeric complexes of catalytically active HER family members depends on allosteric activation between the two kinase domains. To determine the structural basis for HER3 signaling through heterodimerization with a catalytically active HER family member, we solved the crystal structure of the heterodimeric complex formed by the isolated kinase domains of EGFR and HER3. The structure showed HER3 as an allosteric activator of EGFR and revealed a conserved role of the allosteric mechanism in activation of HER family members through heterodimerization. To understand the effects of cancer-associated HER3 mutations at the molecular level, we solved the structures of two kinase domains of HER3 mutants, each in a heterodimeric complex with the kinase domain of EGFR. These structures, combined with biochemical analysis and molecular dynamics simulations, indicated that the cancer-associated HER3 mutations enhanced the allosteric activator function of HER3 by redesigning local interactions at the dimerization interface.

PubMed: 25468994
DOI: 10.1126/scisignal.2005786

Experimental method

X-RAY DIFFRACTION (3.1 Å)