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Related Experiment Videos

Calcium binding is required for calmodulin function in Aspergillus nidulans.

James D Joseph1, Anthony R Means

  • 1Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.

Eukaryotic Cell
|November 29, 2002
PubMed
Summary
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Calmodulin (CaM) in Aspergillus nidulans is essential for growth and requires specific structural features for function. Heterologous CaMs, including vertebrate CaM, show reduced activation of essential CaM-dependent kinases (CaMKs), highlighting unique sensitivities in fungal CaM.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Mycology

Background:

  • Calmodulin (CaM) is a crucial calcium-binding protein involved in diverse cellular processes.
  • Understanding CaM's role in the fungus Aspergillus nidulans is key to deciphering fungal development and signaling.
  • Previous studies suggest CaM's function is highly conserved, but species-specific variations may exist.

Purpose of the Study:

  • To investigate the structural basis for the essential function of Aspergillus nidulans CaM (AnCaM).
  • To compare the biochemical and in vivo properties of AnCaM with heterologous CaMs.
  • To identify specific domains and amino acid residues critical for AnCaM activity.

Main Methods:

  • Biochemical assays including overlay assays to assess protein interactions.

Related Experiment Videos

  • Enzyme kinetics to determine the activation of CaM-dependent kinases (CaMKs) by different CaMs.
  • In vivo complementation studies using heterologous CaMs and chimeric molecules in A. nidulans.
  • Analysis of Ca2+ binding mutants of AnCaM.

    • Main Results:

    • Saccharomyces cerevisiae CaM (ScCaM) and a Ca2+ binding mutant of AnCaM (1234) failed to interact with A. nidulans CaM-binding proteins and activate essential CaMKs (CMKA and CMKB).
    • Vertebrate CaM (VCaM) bound similar proteins but exhibited reduced activation of CMKA and CMKB, with higher K(CaM) and lower Vmax.
    • In vivo, ScCaM and 1234 could not support A. nidulans growth, while VCaM only partially complemented the absence of wild-type CaM. Chimeric analyses indicated both N- and C-terminal domains contribute to VCaM's reduced activity.

    Conclusions:

    • Ca2+ binding is necessary but not sufficient for CaM function in A. nidulans.
    • The essential in vivo functions of AnCaM are uniquely sensitive to subtle amino acid variations found in vertebrate CaM.
    • Structural differences, particularly in the N-terminal domain, significantly impact CaM's ability to activate essential CaMKs and support fungal growth.