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Related Experiment Videos

The RGG domain in hnRNP A2 affects subcellular localization.

R C Nichols1, X W Wang, J Tang

  • 1Section of Connective Tissue Diseases, Dartmouth Medical School, Lebanon, New Hampshire 03756, USA. ralph.c.nichols@dartmouth.edu

Experimental Cell Research
|April 25, 2000
PubMed
Summary
This summary is machine-generated.

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Arginine methylation regulates the nuclear export of hnRNP A2, a lung cancer biomarker. Deleting the RGG domain causes cytoplasmic localization, suggesting a novel methylation-regulated nuclear localization sequence.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Heterogeneous nuclear ribonucleoproteins (hnRNPs) are crucial for RNA processing and transport.
  • hnRNP A2 overexpression is an early lung cancer biomarker and is implicated in brain tumors.
  • The nucleocytoplasmic localization of hnRNP A2 is not well understood.

Purpose of the Study:

  • To investigate the role of arginine methylation in the nucleocytoplasmic localization of hnRNP A2.
  • To identify the specific domain of hnRNP A2 involved in its localization.
  • To explore potential novel localization signals regulated by methylation.

Main Methods:

  • HEK-293 and NIH-3T3 cells were treated with a methyltransferase inhibitor (adenosine dialdehyde).
  • hnRNP A2 localization was assessed using immunoblotting and immunocytochemistry.

Related Experiment Videos

  • In vitro methylation assays with PRMT1 and analysis of hnRNP A2 RGG mutants were performed.

    • Main Results:

    • Inhibition of methylation caused a dramatic shift of hnRNP A2 from the nucleus to the cytoplasm.
    • hnRNP A2 was identified as a substrate for PRMT1, with methylation occurring in the RGG domain.
    • Deletion of the RGG domain (residues 191-253) resulted in a cytoplasmic localization phenotype.

    Conclusions:

    • Arginine methylation of the RGG domain is critical for the nuclear localization of hnRNP A2.
    • The RGG domain contains sequences essential for hnRNP A2 cellular localization.
    • A novel, methylation-regulated nuclear localization sequence may exist within the RGG domain of hnRNP A2.