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Intramembrane ionic protein-lipid interaction regulates integrin structure and function.

Jun Guo1, Youhua Zhang2,3, Hua Li1

  • 1State Key Laboratory of Molecular Biology, Shanghai Science Research Center, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, University of Chinese Academy of Sciences, Shanghai, China.

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Basic residues in transmembrane domains of integrin αLβ2 (LFA-1) stabilize its structure. Intracellular calcium ions (Ca2+) disrupt this interaction, activating integrin adhesion in T cells.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Protein transmembrane domains (TMDs) are typically hydrophobic.
  • Many TMDs feature basic residues at their termini, but their function is unclear.
  • Integrin αLβ2 (LFA-1) plays a crucial role in T cell adhesion.

Purpose of the Study:

  • To investigate the function of membrane-snorkeling basic residues in integrin αLβ2 (LFA-1).
  • To elucidate the mechanism regulating integrin adhesion through transmembrane heterodimer formation.
  • To explore the role of ionic interactions in protein-lipid and protein-ion binding within the membrane.

Main Methods:

  • Bioinformatics analysis of protein transmembrane domains.
  • Biochemical assays to study protein-lipid and protein-ion interactions.
  • Cell-based experiments using T cells to assess integrin activation and adhesion.

Main Results:

  • A conserved Lys residue in the αLβ2 TMD stabilizes the integrin transmembrane heterodimer via ionic interaction with acidic phospholipids.
  • This interaction maintains integrin αLβ2 (LFA-1) in a low-affinity state.
  • Intracellular calcium ions (Ca2+) disrupt the Lys-phospholipid interaction, promoting transmembrane separation and increasing adhesion activity.
  • This Ca2+-mediated regulation is independent of canonical signaling pathways.

Conclusions:

  • Membrane-snorkeling basic residues play a critical role in regulating protein function within the cell membrane.
  • Ionic protein-lipid interactions are important for stabilizing transmembrane protein structures.
  • Calcium ions (Ca2+) directly modulate integrin αLβ2 (LFA-1) conformation and activation through intramembrane ionic interactions.
  • This study reveals a novel mechanism for integrin activation independent of known signaling pathways.