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Derivation of insertin

A Teubner1, H E Meyer, R Kaufmann

  • 1Institut fuer Physiologische Chemie, Ruhr-Universitaet Bochum, Germany.

Cell Motility and the Cytoskeleton
|April 29, 1998
PubMed
Summary
This summary is machine-generated.

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Insertin and tensin originate from a single gene in chickens. While a distinct mRNA for insertin exists, it is expressed at low levels, with most insertin domains arising from tensin proteolysis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Protein Biochemistry

Background:

  • Insertin is an actin-binding protein homologous to a region of tensin.
  • The relationship between insertin and tensin (same gene, different genes, or fragment) was unclear.

Purpose of the Study:

  • To determine if insertin and tensin mRNAs derive from the same gene.
  • To investigate if insertin is a proteolytic fragment of tensin.
  • To analyze the gene structure and expression of insertin and tensin.

Main Methods:

  • Northern blot analysis of chicken gizzard mRNA using specific oligonucleotides.
  • Southern blot analysis of chicken genomic DNA.
  • Mass spectrometry of purified insertin.

Related Experiment Videos

Main Results:

  • A single gene encodes both insertin and tensin.
  • Insertin-specific mRNA transcripts (1.2 and 1.6 kbp) were detected but at low levels.
  • Mass spectrometry indicated insertin peptides likely originate from tensin proteolysis.

Conclusions:

  • Insertin and tensin are derived from a common gene.
  • Low-abundance insertin-specific mRNA suggests limited direct transcription.
  • Proteolytic processing of tensin is a major source of insertin domains in chicken gizzard.