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Related Experiment Videos

Formins: phosphoprotein isoforms encoded by the mouse limb deformity locus

T F Vogt1, L Jackson-Grusby, J Rush

  • 1Department of Genetics, Harvard Medical School, Boston, MA 02115.

Proceedings of the National Academy of Sciences of the United States of America
|June 15, 1993
PubMed
Summary

Mutations in the mouse limb deformity (ld) gene cause developmental defects. Researchers developed antibodies to study formin proteins, revealing they are phosphorylated and bind DNA-cellulose.

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Area of Science:

  • Developmental biology
  • Molecular genetics
  • Protein biochemistry

Background:

  • Mutations at the mouse limb deformity (ld) locus lead to significant embryonic developmental defects in limb and kidney growth and patterning.
  • The ld gene is large and complex, producing multiple alternatively spliced messenger RNA (mRNA) transcripts that encode nuclear protein isoforms known as "formins."

Purpose of the Study:

  • To generate and validate polyclonal antibodies against specific formin peptides.
  • To utilize these antibodies to detect and characterize polypeptides encoded by both wild-type and mutant ld alleles.
  • To investigate the posttranslational modifications and DNA-binding properties of formin isoforms.

Main Methods:

  • Generation of polyclonal antibodies targeting specific formin peptides.

Related Experiment Videos

  • Validation of antibody specificity using cell lines from mice with defined ld mutations.
  • Detection and characterization of polypeptides from wild-type and mutant ld alleles using generated antibodies.
  • Analysis of posttranslational modifications (phosphorylation) and DNA-binding capacity (DNA-cellulose retention) of formin isoforms.

    • Main Results:

    • Antibody authenticity was confirmed using cell lines with molecularly defined mutations at the ld locus.
    • Formin isoforms were detected and characterized in both wild-type and mutant mouse models.
    • A formin isoform was identified to undergo posttranslational phosphorylation at serine and threonine residues.
    • The formin isoform demonstrated retention by DNA-cellulose in crude nuclear extracts, indicating DNA-binding capability.

    Conclusions:

    • The study successfully developed and validated antibodies for formin research.
    • Formin isoforms are subject to posttranslational modification and exhibit DNA-binding properties.
    • These findings provide insights into the molecular mechanisms underlying limb and kidney development regulated by the ld locus.