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Characterisation of a nucleo-adhesome.

Adam Byron1,2, Billie G C Griffith3, Ana Herrero3,4

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Integrin-associated proteins, including focal adhesion kinase (FAK), are found in the nucleus. These nuclear proteins, forming a nucleo-adhesome, regulate gene expression and cell adhesion signaling.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrin-associated proteins primarily function in cell adhesion signaling.
  • These proteins also exhibit roles at sites distant from adhesion receptors.
  • Nuclear proteomes contain adhesome components, suggesting broader cellular functions.

Purpose of the Study:

  • To define and characterize the nucleo-adhesome, a collection of nuclear adhesome components.
  • To investigate the nuclear functions of adhesion proteins, particularly focal adhesion kinase (FAK).
  • To establish a framework for studying nuclear adhesion protein roles.

Main Methods:

  • Proteomic analysis to identify nuclear adhesome components.
  • Experimental validation of nuclear localization for specific adhesion proteins.
  • Assays to determine the regulatory roles of nuclear FAK in gene expression and protein interactions.

Main Results:

  • A significant proportion of adhesome proteins localize to the nucleus, forming the nucleo-adhesome.
  • Nuclear focal adhesion kinase (FAK) regulates the expression of nuclear-localized adhesion proteins.
  • Nuclear FAK interacts with Hic-5, and together they co-regulate a subset of genes transcriptionally.

Conclusions:

  • Adhesion proteins have substantial roles within the nucleus, extending beyond cell adhesion signaling.
  • Nuclear FAK and Hic-5 form a functional complex that controls gene transcription.
  • The study establishes the principle of nuclear adhesion protein subcomplexes cooperating in transcriptional regulation.