NF-kappaB activating scaffold proteins as signaling molecules and putative therapeutic targets

Alain Chariot1, Marie-Alice Meuwis, Marianne Bonif

  • 1Laboratory of Medical Chemistry and Human Genetics, Center for Cellular and Molecular Therapy, Pathology, CHU Sart-Tilman, 4000 Liège, Belgium. Alain.chariot@ulg.ac.be

Insights

Scaffold proteins are essential for activating transcription factors like NF-kappa B. Targeting these proteins could offer new treatments for inflammatory diseases and cancers.

Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • Transcription factor activation, such as for NF-kappa B, relies on complex signaling pathways.
  • These pathways involve sequential protein phosphorylation by kinases.
  • Kinase assembly and activation depend on non-enzymatic scaffold proteins.

Purpose of the Study:

  • To elucidate the role of NF-kappa B activating scaffold proteins in pro-inflammatory cytokine signaling.
  • To explore the connection between scaffold protein mutations and human genetic diseases.
  • To propose scaffold proteins as therapeutic targets for inflammation and cancer.

Main Methods:

  • Descriptive analysis of signaling pathways involving NF-kappa B.
  • Review of literature on scaffold proteins and their interactions.
  • Illustration of human genetic diseases linked to scaffold protein gene mutations.

Main Results:

  • NF-kappa B activating scaffold proteins are crucial for signaling triggered by TNF alpha, IL-1 beta, and CD40 ligand.
  • Mutations in genes encoding these scaffold proteins are associated with human genetic disorders.
  • Scaffold proteins play a vital role in the proper assembly and activation of kinase signaling complexes.

Conclusions:

  • Scaffold proteins are key regulators in inflammatory and immune signaling pathways.
  • Genetic defects in scaffold proteins lead to human diseases.
  • Targeting scaffold proteins presents a promising therapeutic strategy for inflammatory conditions and cancers.

Related Concept Videos

NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Enzyme-linked Receptors01:13

Enzyme-linked Receptors

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...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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...