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Related Experiment Videos

Mutations in ERK2 binding sites affect nuclear entry.

Mustafa N Yazicioglu1, Daryl L Goad1, Aarati Ranganathan1

  • 1Departments of Pharmacology, The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390-9041.

The Journal of Biological Chemistry
|July 28, 2007
PubMed
Summary
This summary is machine-generated.

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Mitogen-activated protein kinase ERK2 enters the nucleus via interactions with nuclear pore proteins. Specific FXF motif interactions are crucial for efficient nuclear import, influencing ERK2 localization in cells.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Mitogen-activated protein kinase ERK2 (Extracellular signal-regulated kinase 2) is a key signaling molecule.
  • ERK2 shuttles between the cytoplasm and nucleus, regulating gene expression.
  • Nuclear import of ERK2 is an energy-independent process facilitated by nuclear pore proteins.

Purpose of the Study:

  • To identify structural features of ERK2 essential for its nuclear entry.
  • To investigate the role of specific protein-protein interactions in ERK2 nuclear localization.
  • To elucidate the contribution of nucleoporin interactions to ERK2 import.

Main Methods:

  • Utilized import reconstitution assays with various ERK2 mutants.
  • Examined ERK2 mutants with defects in substrate binding, docking (D) motifs, and FXF motifs.

Related Experiment Videos

  • Assessed binding affinity of import-impaired mutants to a nucleoporin 153 fragment.
  • Analyzed nuclear accumulation of ERK2 mutants in stimulated cells.

    • Main Results:

    • ERK2 mutants lacking substrate or D-motif binding were imported normally.
    • Mutants defective in FXF motif interactions showed reduced nuclear import rates.
    • Import-impaired mutants exhibited decreased binding to nucleoporin 153.
    • Most mutants accumulated in the nucleus, but one severely impaired mutant remained cytoplasmic.

    Conclusions:

    • Direct interactions with nucleoporins, particularly via FXF motifs, are critical for efficient ERK2 nuclear import.
    • Multiple interaction events contribute to the ligand-dependent nuclear relocalization of ERK2.
    • ERK2 nuclear import is a complex process involving specific structural determinants and nucleoporin binding.