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Related Experiment Videos

Characterization of a beta-actin mRNA zipcode-binding protein

A F Ross1, Y Oleynikov, E H Kislauskis

  • 1Department of Cell Biology, University of Massachusetts Medical School, Worcester 01655, USA.

Molecular and Cellular Biology
|April 1, 1997
PubMed
Summary
This summary is machine-generated.

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Researchers identified ZBP-1, a 68 kDa protein that binds to the beta-actin mRNA zipcode, crucial for localizing mRNA in fibroblasts. This RNA-binding protein functions in a complex to ensure proper mRNA localization.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • RNA Biology

Background:

  • Beta-actin mRNA localization to fibroblast leading edges depends on a 54-nucleotide "zipcode" in its 3' untranslated region.
  • Proteins interacting with the zipcode are hypothesized to mediate this crucial mRNA localization process.

Purpose of the Study:

  • To identify proteins that bind to the beta-actin mRNA zipcode.
  • To elucidate the role of these proteins in mRNA localization.

Main Methods:

  • Band-shift mobility assays, UV cross-linking, and affinity purification were used to identify zipcode-binding proteins.
  • Microsequencing, PCR amplification, and cDNA library screening were employed to clone and characterize the identified protein.
  • Antipeptide antibodies were generated to study protein interactions and complex formation.

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Main Results:

  • A 68 kDa protein, ZBP-1, was identified that specifically binds to the proximal half of the zipcode.
  • ZBP-1 shares homology with known RNA-binding proteins and possesses RNA recognition motifs and a putative nuclear export signal.
  • ZBP-1 was found to function within a complex, co-immunoprecipitating with 120 and 25 kDa proteins, and affinity purification yielded 120 and 53 kDa proteins.
  • Mutation of the ACACCC element within the zipcode significantly reduced protein binding and mRNA localization.

Conclusions:

  • The 68 kDa ZBP-1 is an RNA-binding protein essential for beta-actin mRNA localization.
  • ZBP-1 functions as part of a larger protein complex to mediate mRNA transport and localization in fibroblasts.