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Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
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Unique transmembrane domain interactions differentially modulate integrin αvβ3 and αIIbβ3 function.

Rustem I Litvinov1,2, Marco Mravic3, Hua Zhu4

  • 1Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104.

Proceedings of the National Academy of Sciences of the United States of America
|June 5, 2019
PubMed
Summary
This summary is machine-generated.

Integrin transmembrane helix interactions are crucial for cell signaling. This study reveals two distinct motifs in integrin β3 that mediate mutually exclusive interactions, forming different integrin complexes with unique functions.

Keywords:
force spectroscopyintegrin activationinteraction motifstransmembrane domain

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Area of Science:

  • Membrane protein biophysics
  • Molecular cell biology
  • Structural biology

Background:

  • Transmembrane (TM) helix-helix interactions are vital for cell-surface receptor assembly and signaling.
  • Single-span membrane proteins often possess conserved TM motifs for interaction, but dual-engagement mechanisms are sparsely evidenced.
  • Integrin receptors, crucial for cell adhesion and signaling, rely on TM domain interactions for their function.

Purpose of the Study:

  • To investigate the functional roles of two conserved interaction motifs within the integrin β3-subunit's TM domain.
  • To elucidate how these motifs mediate distinct α-subunit interactions and influence integrin signaling.
  • To explore the mechanism of dual-engagement in integrin TM domains.

Main Methods:

  • Site-directed mutagenesis to alter specific amino acid residues in the β3 TM domain.
  • Optical trap-based force spectroscopy to measure protein interactions.
  • Molecular modeling to simulate and visualize TM helix interactions.

Main Results:

  • The first motif, characterized by "large-large-small" packing, mediates β3-αIIb TM interactions, maintaining integrin αIIbβ3 in an inactive state.
  • The second motif, S-x3-A-x3-I, mediates β3 TM interactions with the αv TM subunit, forming integrin αvβ3.
  • Disruption of the β3 S-x3-A-x3-I motif by mutation activates αvβ3, inducing binding to osteopontin and the WOW-1 antibody.

Conclusions:

  • The integrin β3 TM domain utilizes two mutually exclusive interaction motifs.
  • These motifs enable alternate α-subunit pairing, leading to the formation of distinct integrin complexes (αIIbβ3 and αvβ3).
  • This dual-engagement mechanism allows for the generation of integrins with different biological functions and signaling outputs.