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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

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Different Mi-2 complexes for various developmental functions in Caenorhabditis elegans.

Myriam Passannante1, Claude-Olivier Marti, Catherine Pfefferli

  • 1Department of Biology, University of Fribourg, Fribourg, Switzerland.

Plos One
|November 10, 2010
PubMed
Summary

C. elegans contains three Mi-2 protein complexes: two NuRD complexes and one MEC complex. These complexes have distinct roles in embryonic and postembryonic development, showcasing significant complexity in Mi-2 protein regulation.

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Epigenetics

Background:

  • Vertebrate Mi-2 proteins are part of Nucleosome Remodeling and Deacetylase (NuRD) complexes.
  • NuRD complex subunits are conserved across species, suggesting invertebrate homologs.
  • A dMec complex containing dMi-2 and dMEP-1 was identified in Drosophila.

Purpose of the Study:

  • To investigate the composition and function of Mi-2 protein complexes in C. elegans.
  • To determine if C. elegans possesses NuRD complexes and characterize their subunits.
  • To explore the developmental roles of different C. elegans Mi-2 complexes.

Main Methods:

  • Biochemical purifications from mammalian cells and Xenopus oocytes.
  • Genomic analysis of C. elegans and Drosophila.
  • Identification of protein complexes using techniques like microarrays.

Main Results:

  • C. elegans encodes two Mi-2 orthologs, LET-418 and CHD-3, which define at least three distinct protein complexes.
  • Two NuRD complexes share core subunits but differ in their Mi-2 orthologs (LET-418 or CHD-3).
  • A distinct MEC complex contains LET-418 and MEP-1, crucial for repressing germline potential in early development.

Conclusions:

  • C. elegans Mi-2 proteins form multiple complexes with diverse developmental functions.
  • The MEC complex is vital for early embryonic development, while NuRD complexes may function later.
  • This highlights significant complexity in the composition, function, and tissue-specificity of C. elegans Mi-2 complexes.