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Related Experiment Videos

The class III adenylyl cyclases: multi-purpose signalling modules.

Jürgen U Linder1, Joachim E Schultz

  • 1Fakultät fur Chemie und Pharmazie, Abteilung Pharmazeutische Biochemie, Pharmazeutisches Institut, Universität Tübingen, Morgenstelle 8, D-72076, Tübingen, Germany. juergen.linder@uni-tuebingen.de

Cellular Signalling
|October 25, 2003
PubMed
Summary
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Cyclic adenosine monophosphate (cAMP) is a vital second messenger. Class III adenylyl cyclases, crucial for cAMP generation, exhibit diverse catalytic mechanisms and regulatory inputs across four subclasses.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Cyclic adenosine monophosphate (cAMP) is a ubiquitous second messenger.
  • Class III adenylyl cyclases are the primary enzymes responsible for cAMP synthesis.
  • These enzymes are typically multi-domain proteins with dimeric catalytic cores.

Purpose of the Study:

  • To investigate the structural and functional diversity of class III adenylyl cyclases.
  • To explore the catalytic mechanisms and regulatory adaptations within these enzymes.
  • To classify class III adenylyl cyclases into subclasses based on sequence analysis.

Main Methods:

  • Bioinformatic analysis of amino acid sequence profiles.
  • Comparative genomics and post-genomic data interpretation.

Related Experiment Videos

  • Examination of catalytic residue conservation and variation.

    • Main Results:

    • Class III adenylyl cyclases are divisible into four subclasses (IIIa-IIId).
    • Catalysis occurs at the dimer interface, requiring contributions from both monomers.
    • Alterations in canonical catalytic residues are observed across all subclasses, indicating catalytic plasticity.
    • Numerous regulatory modules are associated with these enzymes, reflecting diverse regulatory inputs.

    Conclusions:

    • Class III adenylyl cyclases display significant versatility in their catalytic and regulatory functions.
    • The identified subclasses highlight distinct evolutionary and functional pathways.
    • Understanding the plasticity of these enzymes presents a significant scientific challenge.