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Related Experiment Videos

Chip and apterous physically interact to form a functional complex during Drosophila development.

D J van Meyel1, D D O'Keefe, L W Jurata

  • 1Salk Institute for Biological Studies, La Jolla, California 92037, USA.

Molecular Cell
|September 17, 1999
PubMed
Summary
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The LIM-binding protein Chip is a cofactor for Apterous (Ap) in Drosophila wing development. Chip and Ap form multimeric complexes crucial for transcriptional regulation, as shown by rescuing ap mutant phenotypes.

Area of Science:

  • Developmental biology
  • Molecular genetics
  • Protein interactions

Background:

  • LIM homeodomain (LIM-HD) proteins are crucial for animal development.
  • The role of LIM-binding protein Chip as a cofactor in developmental pathways is under investigation.

Purpose of the Study:

  • To investigate the role of Chip as a cofactor for the Drosophila LIM-HD protein Apterous (Ap) in wing development.
  • To define the functional domains of Chip and their role in Ap complex formation and transcriptional regulation.

Main Methods:

  • Analysis of Chip domains required for LIM-HD binding and homodimerization.
  • Generation and testing of dominant-negative mutant Chip proteins.
  • Construction and functional assessment of a Chip-Ap chimeric fusion protein.

Related Experiment Videos

Main Results:

  • Chip acts as a cofactor for Ap in Drosophila wing development.
  • Specific domains of Chip are essential for LIM-HD binding and homodimerization.
  • Mutant Chip proteins lacking these domains exhibit dominant-negative effects on Ap function.
  • A Chip-Ap chimera rescues the ap mutant phenotype, confirming the formation of functional multimeric complexes.

Conclusions:

  • Chip and Ap form multimeric complexes that are critical for transcriptional regulation during wing development.
  • Chip's domains for LIM-HD binding and homodimerization are essential for its cofactor function.
  • The findings support a model of Chip-Ap complex involvement in gene regulation during development.