ITGB2
This gene encodes an integrin beta chain, which combines with multiple different alpha chains to form different integrin heterodimers. Integrins are integral cell-surface proteins that participate in cell adhesion as well as cell-surface mediated signalling. The encoded protein plays an important role in immune response and defects in this gene cause leukocyte adhesion deficiency. Alternative splicing results in multiple transcript variants.
Full Name
integrin subunit beta 2
Alternative Names
LAD; CD18; MF17; MFI7; LCAMB; LFA-1; MAC-1
Function
Integrin ITGAL/ITGB2 is a receptor for ICAM1, ICAM2, ICAM3 and ICAM4. Integrin ITGAL/ITGB2 is also a receptor for the secreted form of ubiquitin-like protein ISG15; the interaction is mediated by ITGAL (PubMed:29100055).
Integrins ITGAM/ITGB2 and ITGAX/ITGB2 are receptors for the iC3b fragment of the third complement component and for fibrinogen. Integrin ITGAX/ITGB2 recognizes the sequence G-P-R in fibrinogen alpha-chain. Integrin ITGAM/ITGB2 recognizes P1 and P2 peptides of fibrinogen gamma chain. Integrin ITGAM/ITGB2 is also a receptor for factor X. Integrin ITGAD/ITGB2 is a receptor for ICAM3 and VCAM1. Contributes to natural killer cell cytotoxicity (PubMed:15356110).
Involved in leukocyte adhesion and transmigration of leukocytes including T-cells and neutrophils (PubMed:11812992, PubMed:28807980).
Triggers neutrophil transmigration during lung injury through PTK2B/PYK2-mediated activation (PubMed:18587400).
Integrin ITGAL/ITGB2 in association with ICAM3, contributes to apoptotic neutrophil phagocytosis by macrophages (PubMed:23775590).
In association with alpha subunit ITGAM/CD11b, required for CD177-PRTN3-mediated activation of TNF primed neutrophils (PubMed:21193407).
Biological Process
Aging Source: Ensembl
Amyloid-beta clearance Source: ARUK-UCL
Apoptotic process Source: UniProtKB
Cell adhesion Source: UniProtKB
Cell adhesion mediated by integrin Source: GO_Central
Cell-cell adhesion Source: BHF-UCL
Cell-cell adhesion via plasma-membrane adhesion molecules Source: ARUK-UCL
Cell-cell signaling Source: UniProtKB
Cell-matrix adhesion Source: UniProtKB
Cell migration Source: GO_Central
Cellular extravasation Source: Ensembl
Cellular response to low-density lipoprotein particle stimulus Source: UniProtKB
Cytokine-mediated signaling pathway Source: Reactome
Endodermal cell differentiation Source: UniProtKB
Endothelial cell migration Source: Ensembl
Extracellular matrix organization Source: Reactome
Heterotypic cell-cell adhesion Source: UniProtKB
Inflammatory response Source: UniProtKB
Integrin-mediated signaling pathway Source: UniProtKB
Leukocyte cell-cell adhesion Source: UniProtKB
Leukocyte migration Source: Reactome
Leukocyte migration involved in inflammatory response Source: Ensembl
Microglial cell activation Source: ARUK-UCL
Natural killer cell activation Source: Ensembl
Negative regulation of dopamine metabolic process Source: ARUK-UCL
Neutrophil chemotaxis Source: UniProtKB
Neutrophil degranulation Source: Reactome
Neutrophil migration Source: UniProtKB
Phagocytosis, engulfment Source: ARUK-UCL
Positive regulation of angiogenesis Source: Ensembl
Positive regulation of leukocyte adhesion to vascular endothelial cell Source: UniProtKB
Positive regulation of neuron death Source: ARUK-UCL
Positive regulation of neutrophil degranulation Source: UniProtKB
Positive regulation of NF-kappaB transcription factor activity Source: Ensembl
Positive regulation of nitric oxide biosynthetic process Source: Ensembl
Positive regulation of prostaglandin-E synthase activity Source: ARUK-UCL
Positive regulation of protein targeting to membrane Source: ARUK-UCL
Positive regulation of superoxide anion generation Source: UniProtKB
Receptor clustering Source: UniProtKB
Receptor internalization Source: UniProtKB
Receptor-mediated endocytosis Source: ARUK-UCL
Regulation of cell shape Source: UniProtKB
Regulation of immune response Source: Reactome
Regulation of peptidyl-tyrosine phosphorylation Source: UniProtKB
Toll-like receptor 4 signaling pathway Source: Reactome
Cellular Location
Cell membrane; Membrane raft
Involvement in disease
Leukocyte adhesion deficiency 1 (LAD1): LAD1 patients have recurrent bacterial infections and their leukocytes are deficient in a wide range of adhesion-dependent functions.
Topology
Extracellular: 23-700
Helical: 701-723
Cytoplasmic: 724-769
PTM
Both Ser-745 and Ser-756 become phosphorylated when T-cells are exposed to phorbol esters (PubMed:11700305). Phosphorylation on Thr-758 (but not on Ser-756) allows interaction with 14-3-3 proteins (PubMed:11700305, PubMed:16301335).
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Datasheet