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Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Multidomain Coupling Governs FoxP1 Assembly and Nuclear Compartmentalization.

Anay F Lazaro-Alfaro1,2, Javiera Avilés3, Thomas-Otavio Peulen2,4

  • 1Clemson University, Department of Physics and Astronomy, Clemson, South Carolina, U.S.A.

Biorxiv : the Preprint Server for Biology
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

FoxP1 protein forms complex structures regulated by its leucine-zipper and Forkhead domains. This intricate balance controls its nuclear organization and DNA binding, with disruptions linked to disease.

Keywords:
FLIMFRETFluorescence Lifetime Imaging MicroscopyFoxP1Förster Resonance Energy Transferprotein-protein interactionstranscription factors

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • FoxP1 is a crucial transcription factor involved in development, immunity, and cancer.
  • Its function as a dimer is widely accepted, but assembly mechanisms in living cells are poorly understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms of FoxP1 homotypic interactions and nuclear organization.
  • To investigate how FoxP1 complex stability is regulated by its multidomain architecture.

Main Methods:

  • Biochemical assays were employed to study FoxP1 interactions.
  • Live-cell fluorescence lifetime imaging was used to visualize FoxP1 assembly in real-time.

Main Results:

  • FoxP1 forms heterogeneous complexes stabilized by antagonistic interactions between its leucine-zipper (ZIP) and Forkhead (FKH) domains.
  • The ZIP domain promotes dimerization, while suppressing FKH-mediated interactions, creating a tunable complex formation mechanism.
  • Pathogenic variants disrupt this balance, leading to altered interaction stability and the formation of dense nuclear condensates.

Conclusions:

  • FoxP1 complex assembly is dictated by its multidomain architecture, involving competing interdomain mechanisms.
  • Interdomain coupling regulates transcription factor complex formation, nuclear organization, and DNA binding.
  • Dysregulation of these mechanisms has implications for disease.