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Structural determinants for plant annexin-membrane interactions.

Nicole Dabitz1, Nien-Jen Hu, Adlina Mohd Yusof

  • 1Institut für Medizinische Physik und Biophysik, Universität Leipzig, Leipzig, Germany.

Biochemistry
|December 8, 2005
PubMed
Summary
This summary is machine-generated.

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Two plant annexins show calcium-dependent and independent binding to phospholipid membranes, forming unique rodlike structures. Their N-terminal domains and specific residues are crucial for membrane interactions, suggesting roles in scaffolding and exocytosis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Plant Science

Background:

  • Annexins are a conserved family of calcium-dependent phospholipid-binding proteins.
  • Plant annexins play roles in various cellular processes, but their membrane interaction mechanisms are not fully understood.

Purpose of the Study:

  • To characterize the membrane binding properties of two plant annexins: annexin 24(Ca32) from Capsicum annuum and annexin Gh1 from Gossypium hirsutum.
  • To investigate the structural basis and functional implications of plant annexin-membrane interactions.

Main Methods:

  • Liposome-based assays and adsorption to monolayers were used to study membrane binding.
  • Calcium titration, pH variation, and analysis of N-terminally His-tagged vs. wild-type proteins were employed.
  • Electron microscopy and intrinsic protein fluorescence were utilized to analyze protein assemblies and membrane effects.

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Main Results:

  • Both plant annexins exhibited phosphatidylserine preference and sub-millimolar calcium-dependent binding.
  • Surprisingly, calcium-independent binding (10-20%) was observed at neutral pH, regulated by conserved surface residues.
  • N-terminal domain significantly influenced binding, and electron microscopy revealed elongated, rodlike assemblies.
  • Plant annexins induced membrane aggregation, fusion, and altered membrane hydrophobicity, suggesting roles in cytoskeleton scaffolding or exocytosis.

Conclusions:

  • Plant annexins possess distinct membrane interaction modalities compared to mammalian counterparts, influenced by subtle structural variations.
  • Conserved residues and the N-terminal domain are critical for regulating plant annexin-membrane interactions.
  • The observed rodlike assemblies and membrane effects suggest novel functions in plant cellular processes like membrane organization and transport.