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Related Concept Videos

Receptor Tyrosine Kinases01:26

Receptor Tyrosine Kinases

Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
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...
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...

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Template-directed self-assembly enhances RTK catalytic domain function.

Edward A Esposito1, Anthony L Shrout, Robert M Weis

  • 1P.A. Technologies, LLC, Amherst, Massachusetts 01002, USA. ee@patechllc.com

Journal of Biomolecular Screening
|October 4, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to assemble receptor tyrosine kinase domains on nanometer-scale templates, mimicking cell membranes. This template-directed assembly enhances kinase function and offers new avenues for drug discovery.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Receptor tyrosine kinases (RTKs) are crucial in disease, particularly cancer.
  • Isolated kinase domains lack full membrane-associated function, limiting their use in assays.
  • Current methods do not fully replicate the native membrane environment for kinase activity.

Purpose of the Study:

  • To develop a method for assembling kinase domains on nanometer-scale templates to restore biological function.
  • To investigate the impact of template-directed assembly on the activity of insulin, EphB2, and Tie2 receptor kinase domains.
  • To assess the utility of this method for signal transduction research and drug discovery.

Main Methods:

  • Assembling soluble kinase domains of insulin, EphB2, and Tie2 receptors onto nanometer-scale templates.
  • Comparing autophosphorylation and substrate phosphorylation levels of template-assembled domains versus conventionally assayed domains.
  • Utilizing enzyme inhibitor assays and phosphorylation level measurements.

Main Results:

  • Template assembly significantly increased autophosphorylation for insulin and EphB2 receptor kinase domains.
  • Substrate phosphorylation increased up to 60-fold for insulin and 15-fold for EphB2 receptor kinase domains.
  • Template-assembled Tie2 receptor kinase domain showed lower activity, reflecting its self-inhibitory nature and greater biological relevance.

Conclusions:

  • Template-directed assembly of kinase domains restores biologically relevant function, mimicking membrane environments.
  • This method enhances the utility of kinase domains for studying signal transduction.
  • The approach holds significant promise for basic research and drug discovery in signal transduction pathways.