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Related Experiment Videos

Actin is a binding protein for angiogenin

G F Hu1, D J Strydom, J W Fett

  • 1Center for Biochemical and Biophysical Science and Medicine, Harvard Medical School, Boston, MA 02115.

Proceedings of the National Academy of Sciences of the United States of America
|February 15, 1993
PubMed
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Researchers identified a 42-kDa angiogenin binding protein as actin. This actin protein interacts with angiogenin, influencing blood vessel formation (angiogenesis) and inhibiting its activity, suggesting a key role in the process.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Angiogenin is a protein crucial for angiogenesis, the formation of new blood vessels.
  • A previously isolated 42-kDa protein was known to bind angiogenin.

Purpose of the Study:

  • To identify the 42-kDa angiogenin binding protein.
  • To elucidate the role of this protein and actin in angiogenin-mediated angiogenesis.

Main Methods:

  • Protein purification and electrophoretic homogeneity.
  • Peptide mapping and partial amino acid sequencing for protein identification.
  • In vitro interaction studies between actin and angiogenin, including polymerization assays and inhibition studies.
  • Chicken embryo chorioallantoic membrane assay to assess angiogenic activity.

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Main Results:

  • The 42-kDa angiogenin binding protein was identified as a member of the actin family.
  • Angiogenin induces actin polymerization and interacts with actin in solution and on membranes.
  • Platelet factor 4 and protamine inhibit the angiogenin-actin interaction.
  • Other angiogenic factors (bFGF, TNF-α) also bind to actin.
  • Actin and anti-actin antibodies inhibit angiogenin's angiogenic activity.

Conclusions:

  • The angiogenin binding protein is a cell surface actin.
  • The interaction between angiogenin and cell surface actin is a critical step in angiogenin-induced angiogenesis.