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Related Experiment Videos

Proteins connecting the nuclear pore complex with the nuclear interior.

C Strambio-de-Castillia1, G Blobel, M P Rout

  • 1Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, New York 10021, USA.

The Journal of Cell Biology
|March 23, 1999
PubMed
Summary

Researchers identified Mlp1p and Mlp2p proteins in yeast, forming intranuclear filaments. These structures, independent of the nuclear pore complex, may facilitate macromolecule transport within the nucleus.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • While transport across the nuclear pore complex (NPC) is understood, intranuclear trafficking remains largely unexplored.
  • Nuclear envelope (NE)-associated proteins, excluding nucleoporins, are key to understanding nuclear organization.

Purpose of the Study:

  • To identify and characterize novel proteins involved in intranuclear trafficking.
  • To investigate the function of Mlp1p and Mlp2p, homologs of Tpr proteins, in yeast nuclear organization.

Main Methods:

  • Isolation of NE-associated proteins using a specific assay.
  • Localization of Mlp1p and Mlp2p using microscopy.
  • Nuclear import and overexpression studies of Mlp1p.
  • Analysis of reporter protein transport in MLP1/MLP2 deletion mutants.

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Main Results:

  • Mlp1p and Mlp2p localize to filamentous structures extending from the NE into the nucleoplasm.
  • Mlp1p possesses a nuclear localization sequence and forms large, chromatin-excluding structures upon overexpression.
  • Yeast cells lacking both MLP1 and MLP2 are viable but exhibit altered nuclear transport rates.

Conclusions:

  • Tpr homologues like Mlp1p and Mlp2p function in NPC-independent intranuclear structures.
  • These filaments may act as conduits or tracks for efficient macromolecule translocation within the nucleus.