Related Experiment Video
Updated: Jan 11, 2026

Co-immunoprecipitation Assay for Studying Functional Interactions Between Receptors and Enzymes
Published on: September 28, 2018
Regulation of receptor tyrosine kinase hetero-interactions
Adam W Smith1, Francisco N Barrera2
1Department of Chemistry & Biochemistry, Texas Tech University, Lubbock, TX, 79410, USA.
Abstract:
Receptor tyrosine kinases (RTKs) control myriads of cellular functions. RTKs are paradigmatic examples of receptors where activity is directly dependent on quaternary structure. In most cases, the monomeric RTK is inactive, and function arises only after a ligand binding event leads the RTK to bind to another copy of itself, activating trans-autophosphorylation of tyrosine residues. Such RTK homodimerization can be accompanied by the formation of homomers of higher stoichiometry. However, RTK monomers can also bind to a second type of RTK, forming heterodimers. RTK heteromerization is believed to result in different signaling than homomerization. Despite its importance, we have a poor understanding of the factors that define if an RTK will form homomers or heteromers. This short review covers recent discoveries on the heteromerization of RTK, in what is called the RTK interactome. We discuss its translational potential, and how ligands and membrane lipids affect heteromer formation.
Insights
Receptor tyrosine kinases (RTKs) form dimers to function. This review explores RTK heteromerization, revealing how ligands and lipids influence these interactions and their signaling outcomes.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Receptor tyrosine kinases (RTKs) are crucial for cellular functions.
- RTK activity depends on quaternary structure, typically involving dimerization.
- Both homodimerization and heterodimerization of RTKs occur, leading to distinct signaling pathways.
Purpose of the Study:
- To review recent discoveries in RTK heteromerization within the RTK interactome.
- To explore the factors influencing RTK homomer versus heteromer formation.
- To discuss the translational potential of understanding RTK heteromerization.
Main Methods:
- Literature review of recent discoveries on RTK heteromerization.
- Analysis of the RTK interactome.
- Discussion of factors affecting heteromer formation, including ligands and membrane lipids.
Main Results:
- RTK heteromerization is a significant aspect of the RTK interactome.
- Ligands and membrane lipids play critical roles in modulating RTK heteromer formation.
- Understanding these interactions has potential translational applications.
Conclusions:
- RTK heteromerization is a key determinant of cellular signaling.
- Further research into the RTK interactome is needed to fully understand heteromerization.
- Targeting RTK heteromerization pathways may offer therapeutic strategies.
More Related Videos
Related Concept Videos
Receptor Tyrosine Kinases
Receptor Downregulation in MVBs
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
Amplifying Signals via Enzymatic Cascade
Interactions Between Signaling Pathways
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Enzyme-linked Receptors
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Transducer Mechanism: Enzyme-Linked Receptors
Major types that are helpful drug targets include:

