» Articles » PMID: 12526797

Structures of the Alpha L I Domain and Its Complex with ICAM-1 Reveal a Shape-shifting Pathway for Integrin Regulation

Overview
Journal Cell
Publisher Cell Press
Specialty Cell Biology
Date 2003 Jan 16
PMID 12526797
Citations 237
Authors
Affiliations
Soon will be listed here.
Abstract

The structure of the I domain of integrin alpha L beta 2 bound to the Ig superfamily ligand ICAM-1 reveals the open ligand binding conformation and the first example of an integrin-IgSF interface. The I domain Mg2+ directly coordinates Glu-34 of ICAM-1, and a dramatic swing of I domain residue Glu-241 enables a critical salt bridge. Liganded and unliganded structures for both high- and intermediate-affinity mutant I domains reveal that ligand binding can induce conformational change in the alpha L I domain and that allosteric signals can convert the closed conformation to intermediate or open conformations without ligand binding. Pulling down on the C-terminal alpha 7 helix with introduced disulfide bonds ratchets the beta 6-alpha 7 loop into three different positions in the closed, intermediate, and open conformations, with a progressive increase in affinity.

Citing Articles

Determining Ligand Binding and Specificity Within the β-Integrin Family with a Novel Assay Platform.

Sommer-Pluss C, Leiggener C, Nikci E, Mancuso R, Rabbani S, Lamers C Biomolecules. 2025; 15(2).

PMID: 40001541 PMC: 11853025. DOI: 10.3390/biom15020238.


Molecular dynamics at immune synapse lipid rafts influence the cytolytic behavior of CAR T cells.

Gad A, Morris J, Godret-Miertschin L, Montalvo M, Kerr S, Berger H Sci Adv. 2025; 11(2):eadq8114.

PMID: 39792660 PMC: 11721525. DOI: 10.1126/sciadv.adq8114.


Ca transients on the T cell surface trigger rapid integrin activation in a timescale of seconds.

Li Y, Wang S, Zhang Y, Liu Z, Zheng Y, Zhang K Nat Commun. 2024; 15(1):6131.

PMID: 39033133 PMC: 11271479. DOI: 10.1038/s41467-024-50464-0.


The Role of Biophysical Factors in Organ Development: Insights from Current Organoid Models.

Wyle Y, Lu N, Hepfer J, Sayal R, Martinez T, Wang A Bioengineering (Basel). 2024; 11(6).

PMID: 38927855 PMC: 11200479. DOI: 10.3390/bioengineering11060619.


αI-domain of integrin Mac-1 binds the cytokine pleiotrophin using multiple mechanisms.

Nguyen H, Podolnikova N, Ugarova T, Wang X Structure. 2024; 32(8):1184-1196.e4.

PMID: 38729161 PMC: 11316656. DOI: 10.1016/j.str.2024.04.013.


References
1.
Oxvig C, Lu C, Springer T . Conformational changes in tertiary structure near the ligand binding site of an integrin I domain. Proc Natl Acad Sci U S A. 1999; 96(5):2215-20. PMC: 26763. DOI: 10.1073/pnas.96.5.2215. View

2.
Grakoui A, Bromley S, Sumen C, Davis M, Shaw A, Allen P . The immunological synapse: a molecular machine controlling T cell activation. Science. 1999; 285(5425):221-7. DOI: 10.1126/science.285.5425.221. View

3.
Giancotti F, Ruoslahti E . Integrin signaling. Science. 1999; 285(5430):1028-32. DOI: 10.1126/science.285.5430.1028. View

4.
van Kooyk Y, van Vliet S, Figdor C . The actin cytoskeleton regulates LFA-1 ligand binding through avidity rather than affinity changes. J Biol Chem. 1999; 274(38):26869-77. DOI: 10.1074/jbc.274.38.26869. View

5.
Kallen J, Welzenbach K, Ramage P, Geyl D, Kriwacki R, Legge G . Structural basis for LFA-1 inhibition upon lovastatin binding to the CD11a I-domain. J Mol Biol. 1999; 292(1):1-9. DOI: 10.1006/jmbi.1999.3047. View