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Arrange the following cellular events in the proper order in which they occur in the activation of NFkB pathway 1= IKK complexes phosphorylate IκB proteins 2= IκB ubiquitination and proteasomal degradation 3= NF-κB complexes translocate into the nucleus 4= NF-κB complexes induce target gene expression

  • 1, 2, 3, 4 (correct)
  • 1, 3, 2, 4
  • 2, 3, 1, 4
  • 2, 3, 4, 1
  • How does NF-κB induce gene expression?

  • A small, hydrophobic ligand binds to NF-κB, activating it
  • Phosphorylation of the inhibitor Iκ-B dissociates the complex between it and NF-κB, and allows NF-κB to enter the nucleus and stimulate transcription (correct)
  • NF-κB is phosphorylated and is then free to enter the nucleus and bind DNA
  • . NF-κB is a kinase that phosphorylates a transcription factor that binds DNA and promotes protein production.
  • Activation of NFkB pathway results in the transcription of genes involved in cell survival and inflammation. What prevents this process from occurring in the absence of stimuli?

  • . Binding of IkBa to NFkB dimer (correct)
  • Phosphorylation of RelA
  • Lack of transcription of IkBa
  • Ubiquitination and proteasomal degradation of NFkB dimer
  • Ubiquitination is a post-translational modification process, that attaches ubiquitin to a target protein. This process plays an important role in the activation of NFkB pathway. What is ubiquitin?

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