Annexin-Membrane Interactions Across Eukaryotic Domains of Life-A Comparative Approach

Area of Science:

• Molecular and Cellular Biology
• Biochemistry
• Eukaryotic Cell Biology

Background:

• Annexins are a protein family known for their calcium-dependent binding to anionic phospholipids in cell membranes.
• These proteins are implicated in various cellular processes, including membrane trafficking, repair, and signal transduction.
• While extensively studied in mammals and plants, annexin roles in invertebrates, fungi, and protists remain less understood.

Purpose of the Study:

• To review and synthesize current knowledge on annexin-membrane interactions across diverse eukaryotic organisms.
• To compare the functional roles of annexins in different life forms, focusing on membrane repair, protein trafficking, and channel formation.
• To identify knowledge gaps regarding annexins in non-model eukaryotes and their potential implications for cellular function and disease.

Main Methods:

• Comprehensive literature review of studies on annexin structure, function, and membrane interactions.
• Comparative analysis of annexin families and their characterized roles across major eukaryotic lineages (Metazoa, Fungi, Protista, Plantae, Animalia).
• Identification and discussion of conserved and divergent annexin functions based on lipid-binding and calcium-sensitivity.

Main Results:

• Annexins exhibit conserved lipid and calcium-binding properties essential for membrane association.
• Key functions such as membrane repair and vesicle trafficking are recurrent themes across diverse eukaryotes.
• Evidence suggests potential roles in ion channel formation and other membrane-associated processes, varying by organism.

Conclusions:

• Annexin-membrane interactions are fundamental to eukaryotic cell biology, with conserved roles in membrane dynamics.
• Further research into annexins in invertebrates, fungi, and protists is crucial for a complete understanding of their evolutionary significance.
• Elucidating annexin functions may reveal novel therapeutic targets for diseases involving membrane dysfunction.