Interleukin-12 subunit beta

Interleukin 12B (natural killer cell stimulatory factor 2, cytotoxic lymphocyte maturation factor 2, p40)
PDB rendering based on 1f42.
Available structures PDB 1F42, 1F45, 3D85, 3D87, 3DUH, 3HMX
Identifiers
Symbols	IL12B; CLMF; CLMF2; IL-12B; NKSF; NKSF2
External IDs	OMIM: 161561 MGI: 96540 HomoloGene: 1648 GeneCards: IL12B Gene
Gene Ontology Molecular function • cytokine receptor activity • cytokine activity • interleukin-12 receptor binding • interleukin-12 receptor binding • protein binding • growth factor activity • interleukin-12 alpha subunit binding • identical protein binding • protein homodimerization activity • interleukin-23 receptor binding • protein heterodimerization activity Cellular component • extracellular region • extracellular space • cytoplasm • membrane • interleukin-12 complex • interleukin-23 complex Biological process • positive regulation of T cell mediated cytotoxicity • positive regulation of defense response to virus by host • positive regulation of defense response to virus by host • positive regulation of T-helper 1 type immune response • positive regulation of T-helper 1 type immune response • positive regulation of natural killer cell mediated cytotoxicity directed against tumor cell target • negative regulation of inflammatory response to antigenic stimulus • cell cycle arrest • response to UV-B • positive regulation of activation of JAK2 kinase activity • cell migration • sexual reproduction • natural killer cell activation • negative regulation of interleukin-10 production • negative regulation of interleukin-17 production • positive regulation of granulocyte macrophage colony-stimulating factor production • positive regulation of interferon-gamma production • positive regulation of interleukin-10 production • positive regulation of interleukin-10 production • positive regulation of interleukin-12 production • positive regulation of interleukin-17 production • positive regulation of tumor necrosis factor production • positive regulation of natural killer cell activation • positive regulation of natural killer cell activation • positive regulation of natural killer cell proliferation • positive regulation of tissue remodeling • positive regulation of smooth muscle cell apoptosis • regulation of cytokine biosynthetic process • T-helper 1 type immune response • T-helper cell differentiation • interferon-gamma biosynthetic process • positive regulation of T cell proliferation • positive regulation of activated T cell proliferation • positive regulation of NF-kappaB import into nucleus • regulation of tyrosine phosphorylation of Stat1 protein • positive regulation of tyrosine phosphorylation of Stat3 protein • positive regulation of tyrosine phosphorylation of Stat4 protein • positive regulation of tyrosine phosphorylation of Stat5 protein • defense response to protozoan • positive regulation of memory T cell differentiation • negative regulation of growth of symbiont in host • positive regulation of interferon-gamma biosynthetic process • positive regulation of osteoclast differentiation • positive regulation of cell adhesion • negative regulation of smooth muscle cell proliferation • positive regulation of lymphocyte proliferation • positive regulation of inflammatory response • defense response to Gram-negative bacterium • positive regulation of NK T cell activation • positive regulation of NK T cell activation • positive regulation of NK T cell proliferation • defense response to virus • cellular response to lipopolysaccharide • cellular response to interferon-gamma • positive regulation of T-helper 17 type immune response • positive regulation of T-helper 17 cell lineage commitment Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	3593	16160
Ensembl	ENSG00000113302	ENSMUSG00000004296
UniProt	P29460	P43432
RefSeq (mRNA)	NM_002187.2	NM_008352.2
RefSeq (protein)	NP_002178.2	NP_032378.1
Location (UCSC)	Chr 5: 158.74 – 158.76 Mb	Chr 11: 44.21 – 44.23 Mb
PubMed search	[1]	[2]

Subunit beta of interleukin 12 (also known as natural killer cell stimulatory factor 2, or cytotoxic lymphocyte maturation factor 2, p40) (human gene name IL12B) is a subunit of human interleukin 12.

This gene encodes a subunit of interleukin 12, a cytokine that acts on T and natural killer cells, and has a broad array of biological activities. Interleukin 12 is a disulfide-linked heterodimer composed of the 40 kD cytokine receptor like subunit encoded by this gene, and a 35 kD subunit encoded by IL12A. This cytokine is expressed by activated macrophages that serve as an essential inducer of Th1 cells development. This cytokine has been found to be important for sustaining a sufficient number of memory/effector Th1 cells to mediate long-term protection to an intracellular pathogen. Overexpression of this gene was observed in the central nervous system of patients with multiple sclerosis (MS), suggesting a role of this cytokine in the pathogenesis of the disease. The promoter gene polymorphism of this gene has been reported to be associated with the severity of atopic and non-atopic asthma in children.

Interactions

Interleukin-12 subunit beta has been shown to interact with Interleukin 23.

RNA editing

Interleukin 12 receptor, beta 2 subunit(IL12Rβ2) is a product of the IL12-R β2 gene.As previously mentioned the gene product is one of two subunits which combine to form the IL-12 receptor.The other subunit being IL12-R β1 subunit. The β2 subunit is only expressed in Th1 lymphocytes.The pre-mRNA of the IL12-R β2 gene is subject to RNA editing.

Editing type

Cytidine to Uridine (C to U) RNA editing.

Editing sites

The editing site is located at nucleotide 2451 which is found in exon 13 which forms part of the extracellular domain of the protein. However another report was unable to detect this C to U conversion

Protein structure

Editng results in an amino acid change fro an alanine to a valine may cause a conformational change in the IL12 receptor.

Protein function

Edting causes a reduction in the extent of IL-12 signalling as the β subunit is involved in signal transduction.This leads to insufficient IFN-γ production possibly due to an interruption of the binding of IL12 to its receptor.Binding may be restricyed due to a conformational change caused by the change of amino acid.The change in the signalling cascade and reduction of IFN-γ effects downregulation of IgE. Atrophy patients have enhanced IgE sensitivity to everyday environmental factors such as asthma.This is the only editing event linked to atrophy.

Associated conditions

There is an increase in the frequency of editing in Atopic patients (20.6%) from that non atopic patients (3.8%) transcripts.This is the first reported case that indicates that atopy could be associated with RNA editing.Atopy is characterized by enhanced immunoglobulin E (IgE) responses to common environmental antigens and leads to clinical disorders such as asthma, eczema and rhinitis.

Further reading

• Airoldi I, Guglielmino R, Carra G, et al. (2002). "The interleukin-12 and interleukin-12 receptor system in normal and transformed human B lymphocytes". Haematologica 87 (4): 434–42. PMID 11940489. 
• Abdi K (2002). "IL-12: the role of p40 versus p75". Scand. J. Immunol. 56 (1): 1–11. doi:10.1046/j.1365-3083.2002.01101.x. PMID 12100467. 
• Sieburth D, Jabs EW, Warrington JA, et al. (1992). "Assignment of genes encoding a unique cytokine (IL12) composed of two unrelated subunits to chromosomes 3 and 5". Genomics 14 (1): 59–62. doi:10.1016/S0888-7543(05)80283-6. PMID 1358798. 
• Wolf SF, Temple PA, Kobayashi M, et al. (1991). "Cloning of cDNA for natural killer cell stimulatory factor, a heterodimeric cytokine with multiple biologic effects on T and natural killer cells". J. Immunol. 146 (9): 3074–81. PMID 1673147. 
• Gubler U, Chua AO, Schoenhaut DS, et al. (1991). "Coexpression of two distinct genes is required to generate secreted bioactive cytotoxic lymphocyte maturation factor". Proc. Natl. Acad. Sci. U.S.A. 88 (10): 4143–7. doi:10.1073/pnas.88.10.4143. PMC 51614. PMID 1674604. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=51614. 
• Gearing DP, Cosman D (1991). "Homology of the p40 subunit of natural killer cell stimulatory factor (NKSF) with the extracellular domain of the interleukin-6 receptor". Cell 66 (1): 9–10. doi:10.1016/0092-8674(91)90131-H. PMID 2070420. 
• Stern AS, Podlaski FJ, Hulmes JD, et al. (1990). "Purification to homogeneity and partial characterization of cytotoxic lymphocyte maturation factor from human B-lymphoblastoid cells". Proc. Natl. Acad. Sci. U.S.A. 87 (17): 6808–12. doi:10.1073/pnas.87.17.6808. PMC 54627. PMID 2204066. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=54627. 
• Aragane Y, Riemann H, Bhardwaj RS, et al. (1995). "IL-12 is expressed and released by human keratinocytes and epidermoid carcinoma cell lines". J. Immunol. 153 (12): 5366–72. PMID 7527439. 
• Ling P, Gately MK, Gubler U, et al. (1995). "Human IL-12 p40 homodimer binds to the IL-12 receptor but does not mediate biologic activity". J. Immunol. 154 (1): 116–27. PMID 7527811. 
• Murphy TL, Cleveland MG, Kulesza P, et al. (1995). "Regulation of interleukin 12 p40 expression through an NF-kappa B half-site". Mol. Cell. Biol. 15 (10): 5258–67. PMC 230773. PMID 7565674. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=230773. 
• Sharma V, Knobloch TJ, Benjamin D (1995). "Differential expression of cytokine genes in HIV-1 tat transfected T and B cell lines". Biochem. Biophys. Res. Commun. 208 (2): 704–13. doi:10.1006/bbrc.1995.1395. PMID 7695626. 
• Warrington JA, Bengtsson U (1995). "High-resolution physical mapping of human 5q31-q33 using three methods: radiation hybrid mapping, interphase fluorescence in situ hybridization, and pulsed-field gel electrophoresis". Genomics 24 (2): 395–8. doi:10.1006/geno.1994.1636. PMID 7698768. 
• D'Andrea A, Ma X, Aste-Amezaga M, et al. (1995). "Stimulatory and inhibitory effects of interleukin (IL)-4 and IL-13 on the production of cytokines by human peripheral blood mononuclear cells: priming for IL-12 and tumor necrosis factor alpha production". J. Exp. Med. 181 (2): 537–46. doi:10.1084/jem.181.2.537. PMC 2191875. PMID 7836910. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2191875. 
• Gillessen S, Carvajal D, Ling P, et al. (1995). "Mouse interleukin-12 (IL-12) p40 homodimer: a potent IL-12 antagonist". Eur. J. Immunol. 25 (1): 200–6. doi:10.1002/eji.1830250133. PMID 7843232. 
• Radrizzani M, Accornero P, Amidei A, et al. (1995). "IL-12 inhibits apoptosis induced in a human Th1 clone by gp120/CD4 cross-linking and CD3/TCR activation or by IL-2 deprivation". Cell. Immunol. 161 (1): 14–21. doi:10.1006/cimm.1995.1003. PMID 7867080. 
• Ma X, Chow JM, Gri G, et al. (1996). "The interleukin 12 p40 gene promoter is primed by interferon gamma in monocytic cells". J. Exp. Med. 183 (1): 147–57. doi:10.1084/jem.183.1.147. PMC 2192398. PMID 8551218. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2192398. 
• Fantuzzi L, Gessani S, Borghi P, et al. (1996). "Induction of interleukin-12 (IL-12) by recombinant glycoprotein gp120 of human immunodeficiency virus type 1 in human monocytes/macrophages: requirement of gamma interferon for IL-12 secretion". J. Virol. 70 (6): 4121–4. PMC 190299. PMID 8648753. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=190299. 
• Cella M, Scheidegger D, Palmer-Lehmann K, et al. (1996). "Ligation of CD40 on dendritic cells triggers production of high levels of interleukin-12 and enhances T cell stimulatory capacity: T-T help via APC activation". J. Exp. Med. 184 (2): 747–52. doi:10.1084/jem.184.2.747. PMC 2192696. PMID 8760829. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2192696. 
• Kato K, Shimozato O, Hoshi K, et al. (1996). "Local production of the p40 subunit of interleukin 12 suppresses T-helper 1-mediated immune responses and prevents allogeneic myoblast rejection". Proc. Natl. Acad. Sci. U.S.A. 93 (17): 9085–9. doi:10.1073/pnas.93.17.9085. PMC 38599. PMID 8799158. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=38599. 
• Taoufik Y, Lantz O, Wallon C, et al. (1997). "Human immunodeficiency virus gp120 inhibits interleukin-12 secretion by human monocytes: an indirect interleukin-10-mediated effect". Blood 89 (8): 2842–8. PMID 9108403.