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In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
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A dynamic interface between ubiquitylation and cAMP signaling.

Laura Rinaldi1, Maria Sepe1, Rossella Delle Donne1

  • 1Dipartimento di Medicina Molecolare e Biotecnologie Mediche, University of Naples Federico II , Naples, Italy.

Frontiers in Pharmacology
|September 22, 2015
PubMed
Summary
This summary is machine-generated.

Cyclic AMP (cAMP) signaling, crucial for cell functions, is regulated by the ubiquitin-proteasome system (UPS) through A-Kinase Anchor proteins (AKAPs). This interaction impacts cell dysfunction and disease.

Keywords:
AKAPPKA signalingcyclic AMPproteasomeubiquitination

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Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • Cyclic AMP (cAMP) is a vital second messenger regulating diverse cellular processes like differentiation and metabolism.
  • Protein Kinase A (PKA) mediates most cAMP effects in mammals, activated by cAMP.
  • A-Kinase Anchor proteins (AKAPs) compartmentalize PKA, organizing signaling complexes.

Purpose of the Study:

  • To explore the novel interface between compartmentalized cAMP signaling and the ubiquitin-proteasome system (UPS).
  • To investigate the reciprocal regulation between cAMP signaling and UPS.
  • To elucidate the relevance of this interplay in human degenerative and proliferative disorders.

Main Methods:

  • Analysis of multivalent complexes nucleated by AKAPs.
  • Investigating the presence and role of ubiquitin-proteasome system (UPS) components within AKAP complexes.
  • Examining the regulatory effects of UPS on AKAP-PKA signaling pathways.

Main Results:

  • AKAP complexes, which anchor PKA, incorporate components of the ubiquitin-proteasome system (UPS).
  • The UPS actively regulates AKAP complexes, influencing downstream cAMP signaling.
  • A previously unpredicted interface exists between compartmentalized signaling and the UPS.

Conclusions:

  • The ubiquitin-proteasome system (UPS) dynamically regulates cAMP-PKA signaling via AKAP complexes.
  • Dysregulation of this cAMP-UPS interplay may contribute to cell dysfunction and diseases.
  • Understanding this cross-talk is crucial for human degenerative and proliferative disorders.