Bidirectional Transmembrane Signaling by Cytoplasmic Domain Separation in Integrins
Abstract
Although critical for development, immunity, wound healing, and metastasis, integrins represent one of the few classes of plasma membrane receptors for which the basic signaling mechanism remains a mystery. We investigated cytoplasmic conformational changes in the integrin LFA-1 (α L β 2 ) in living cells by measuring fluorescence resonance energy transfer between cyan fluorescent protein–fused and yellow fluorescent protein–fused α L and β 2 cytoplasmic domains. In the resting state these domains were close to each other, but underwent significant spatial separation upon either intracellular activation of integrin adhesiveness (inside-out signaling) or ligand binding (outside-in signaling). Thus, bidirectional integrin signaling is accomplished by coupling extracellular conformational changes to an unclasping and separation of the α and β cytoplasmic domains, a distinctive mechanism for transmitting information across the plasma membrane.
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Chemokine activation of leukocytes initiates relocation and conformational changes to integrins LFA-1 and VLA4 that form high-affinity binding sites for firm adhesion onto endothelial cells.
“Here, chemokine activation of leukocytes initiates relocation and conformational changes to the integrins, lymphocyte function-associated antigen 1 (LFA-1) and very late antigen 4 (VLA4), that form highaffinity binding sites for firm adhesion onto endothelial cells (Kim et al, 2003).”
From Repeated Social Defeat, Neuroinflammation, and Behavior: Monocytes Carry the Signal (2017) · cites this paper as Kim et al, 2003
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- Authors
- Kim, M., Carman, C. V., & Springer, T. A.
- Affiliations
- Harvard University (US)
- Corresponding author
- Kim, Minsoo
- Carman, Christopher V.
- Springer, Timothy A.
- Venue
- Science
- Published
- 2003-09-19
- Volume
- 301
- Issue
- 5640
- Pages
- 1720-1725
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2031261181
- Cited by
- 786
- References
- 32
- Citations by year
- 2026: 5 · 2025: 7 · 2024: 10 · 2023: 21 · 2022: 19 · 2021: 26 · 2020: 14 · 2019: 19 · 2018: 20 · 2017: 20 · 2016: 30 · 2015: 26 · 2014: 24 · 2013: 40 · 2012: 45
- FWCI
- 29.38
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Cancer Institute (CA 31798)
- Topics
- Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
- Keywords
- integrins, LFA-1, transmembrane signaling, inside-out signaling, outside-in signaling, ligand binding, conformational change, fluorescence resonance energy transfer, plasma membrane receptors
- MeSH terms
- Antibodies, Monoclonal, Bacterial Proteins, Cell Adhesion, Cell Membrane, Cytoplasm, Humans, Ligands, Luminescent Proteins, Protein Conformation, Recombinant Fusion Proteins, Transfection, Tumor Cells, Cultured, Signal Transduction, Lymphocyte Function-Associated Antigen-1, Talin, Protein Structure, Tertiary, Intercellular Adhesion Molecule-1, CD18 Antigens, Dimerization, Receptors, CXCR4, Chemokines, CXC, Fluorescence Resonance Energy Transfer, CD11a Antigen, Green Fluorescent Proteins, Chemokine CXCL12
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