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Regulation of Nuclear Protein Sorting01:45

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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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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
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4D Imaging of Protein Aggregation in Live Cells
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Protein folding and quality control during nuclear transport.

Sunanda Mallik1, Dylan Poch1, Sophia Burick1

  • 1Yale University, Department of Molecular Biophysics and Biochemistry, New Haven, CT, USA.

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Co-translational nuclear import uses import machinery to aid protein folding, preventing aggregation and ensuring transport. This dynamic interplay maintains nuclear pore complex function and impacts neurological disorder research.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein synthesis occurs spatially separate from protein destinations, necessitating efficient transport systems.
  • Co-translational transport offers advantages by preventing cytosolic aggregation and avoiding energy-intensive unfolding for translocation.
  • The temporal coordination between translation, protein folding, and nuclear import remains poorly understood.

Purpose of the Study:

  • To explore the implications of co-translational engagement with nuclear import machinery.
  • To propose a model for how nuclear import factors influence protein folding during translocation.
  • To connect these mechanisms to neurological disorders linked to nuclear transport defects.

Main Methods:

  • Conceptual modeling of protein transport dynamics.
  • Analysis of the interplay between karyopherins, nucleoporins, and nascent polypeptides.
  • Review of existing literature on nuclear transport and protein quality control.

Main Results:

  • The nuclear import machinery, through karyopherins and nucleoporins, may facilitate protein folding en route to the nucleus.
  • This co-translational process can create a protected environment for folding cargo.
  • The nuclear pore complex maintains its barrier function while accommodating co-translational import.

Conclusions:

  • A dynamic interplay between importins and nucleoporins supports co-translational protein folding and nuclear import.
  • This model offers insights into the molecular mechanisms underlying nuclear transport and protein homeostasis.
  • Defects in these processes may contribute to the pathogenesis of neurological disorders.