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The annexins.

Stephen E Moss1, Reg O Morgan

  • 1Division of Cell Biology, Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL, UK. s.moss@ucl.ac.uk

Genome Biology
|April 3, 2004
PubMed
Summary
This summary is machine-generated.

Annexins are calcium-binding proteins with diverse roles beyond phospholipid binding. Their core domain and variable N-terminal regions dictate functions in cell structure, signaling, and ion transport.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Annexins are a superfamily of calcium-dependent phospholipid-binding proteins found across eukaryotic phyla, absent in yeasts and prokaryotes.
  • They possess a conserved core domain of four repeats, each with a calcium-binding motif, and variable N-terminal domains responsible for localization and function.
  • Annexins are implicated in cellular processes including membrane organization, intracellular signaling, growth control, and ion flux, potentially acting as atypical calcium channels.

Purpose of the Study:

  • To explore the complex functions of annexins beyond their traditional role.
  • To investigate the structural basis for annexin function, including calcium channel activity and protein-protein interactions.
  • To understand the evolutionary significance of structural differences within the annexin superfamily.

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Main Methods:

  • Analysis of site-specific conservation within the annexin core domain.
  • Comparative analysis of structural features across annexin subfamilies.
  • Examination of N-terminal domain variations and their impact on protein localization and function.

Main Results:

  • Site-specific conservation analysis points to buried residues in the core domain being crucial for vertebrate annexin calcium-channel activity and structural stability.
  • Evolutionarily important differences are located on the protein surface, influencing membrane binding and interactions with cytosolic proteins.
  • N-terminal domains contribute to distinct protein localizations and specialized functions via post-translational modifications and protein interactions.

Conclusions:

  • Annexins exhibit a broader functional repertoire than previously recognized, involving diverse cellular processes.
  • Structural analysis reveals key residues and surface sites critical for annexin function, stability, and interactions.
  • Evolutionary divergence in annexin subfamilies is driven by modifications affecting membrane and protein interactions, leading to specialized roles.