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Immunoglobulin G

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provide protective immunity. In 2013, the Temporal Model of human IgE and IgG function was proposed. This model suggests that IgG3 (and IgE) appear early in a response. The IgG3, though of relatively low affinity, allows IgG-mediated defences to join IgM-mediated defences in clearing foreign antigens. Subsequently, higher affinity IgG1 and IgG2 are produced. The relative balance of these subclasses, in any immune complexes that form, helps determine the strength of the inflammatory processes that follow. Finally, if antigen persists, high affinity IgG4 is produced, which dampens down inflammation by helping to curtail FcR-mediated processes.
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result, 20 times higher doses of IgG1, in relationship to IgG2a autoantibodies, were required to induce autoantibody mediated pathology. Since mouse IgG1 and human IgG1 are not entirely similar in function, and the inference of human antibody function from mouse studies must be done with great care. However, both human and mouse antibodies have different abilities to fix complement and to bind to
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In a mouse model of autoantibody mediated anemia using IgG isotype switch variants of an anti erythrocytes autoantibody, it was found that mouse IgG2a was superior to IgG1 in activating complement. Moreover, it was found that the IgG2a isotype was able to interact very efficiently with FcgammaR. As a
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Therefore, in the first six months of life, the newborn has the same antibodies as the mother and the child can defend itself against all the pathogens that the mother encountered in her life (even if only through vaccination) until these antibodies are degraded. This repertoire of immunoglobulins is
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Note: IgG affinity to Fc receptors on phagocytic cells is specific to individual species from which the antibody comes as well as the class. The structure of the hinge regions (region 6 in the diagram) contributes to the unique biological properties of each of the four IgG classes. Even though there
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site at asparagine 297 in the constant region of the heavy chain. The N-glycans attached to this site are predominantly core-fucosylated biantennary structures of the complex type. In addition, small amounts of these N-glycans also bear bisecting GlcNAc and α-2,6-linked sialic acid residues. The
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Given the opposing properties of the IgG subclasses (fixing and failing to fix complement; binding and failing to bind FcR), and the fact that the immune response to most antigens includes a mix of all four subclasses, it has been difficult to understand how IgG subclasses can work together to
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Cox L, Williams B, Sicherer S, Oppenheimer J, Sher L, Hamilton R, Golden D (2008). "Pearls and pitfalls of allergy diagnostic testing: report from the American College of Allergy, Asthma and Immunology/American Academy of Allergy, Asthma and Immunology Specific IgE Test Task Force".
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IgG antibodies are large globular proteins made of four peptide chains; two identical γ (gamma) heavy chains of about 50 kDa and two identical light chains of about 25 kDa. The resulting tetrameric quaternary structure, therefore, has a total molecular weight of about
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IgG antibodies can prevent IgE mediated anaphylaxis by intercepting a specific antigen before it binds to mast cell–associated IgE. Consequently, IgG antibodies block systemic anaphylaxis induced by small quantities of
1323:"Anti-cyclic citrullinated peptide antibody isotypes in rheumatoid arthritis: association with disease duration, rheumatoid factor production and the presence of shared epitope" 239:
contains a high percentage of IgG, especially bovine colostrum. In individuals with prior immunity to a pathogen, IgG appears about 24–48 hours after antigenic stimulation.
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Parekh, R. B.; Dwek, R. A.; Sutton, B. J.; Fernandes, D. L.; Leung, A.; Stanworth, D.; Rademacher, T. W.; Mizuochi, T.; Taniguchi, T.; Matsuta, K. (1–7 August 1985).
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The relative ability of different IgG subclasses to fix complement may explain why some anti-donor antibody responses do harm a graft after organ transplantation.
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Stadlmann J, Pabst M, Kolarich D, Kunert R, Altmann F (2008). "Analysis of immunoglobulin glycosylation by LC-ESI-MS of glycopeptides and oligosaccharides".
827: 1567: 1413: 1274:"Complement activation selectively potentiates the pathogenicity of the IgG2b and IgG3 isotypes of a high affinity anti-erythrocyte autoantibody" 1322: 157: 1478:
Stapel, Steven O.; Asero, R.; Ballmer-Weber, B. K.; Knol, E. F.; Strobel, S.; Vieths, S.; Kleine-Tebbe, J.; EAACI Task Force (July 2008).
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There are four IgG subclasses (IgG1, 2, 3, and 4) in humans, named in order of their abundance in serum (IgG1 being the most abundant).
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Azeredo da Silveira S, Kikuchi S, Fossati-Jimack L, Moll T, Saito T, Verbeek JS, Botto M, Walport MJ, Carroll M, Izui S (2002-03-18).
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Testing of IgG is not indicated for diagnosis of allergy, and there is no evidence that it has any relationship to food intolerances.
1397: 303:. The resulting tetramer has two identical halves, which together form a Y-like shape. Each end of the fork contains an identical 1560: 1321:
Lakos G, Soós L, Fekete A, Szabó Z, Zeher M, Horváth IF, Dankó K, Kapitány A, Gyetvai A, Szegedi G, Szekanecz Z (Mar–Apr 2008).
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IgG are also involved in the regulation of allergic reactions. According to Finkelman, there are two pathways of systemic
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crucial for the newborns who are very sensitive to infections, especially within the respiratory and digestive systems.
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Hashira S, Okitsu-Negishi S, Yoshino K (August 2000). "Placental transfer of IgG subclasses in a Japanese population".
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binding site. The various regions and domains of a typical IgG are depicted in the figure "Anatomy of an IgG".
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is about 95% similarity between their Fc regions, the structure of the hinge regions is relatively different.
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American Academy of Allergy, Asthma, and Immunology, American Academy of Allergy, Asthma, and Immunology.
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N-glycan composition in IgG has been linked to several autoimmune, infectious and metabolic diseases.
1545: 2001: 1342: 1903: 1661: 1480:"Testing for IgG4 against foods is not recommended as a diagnostic tool: EAACI Task Force Report" 117: 1374: 1368: 1365:"Ch5 Laboratory Diagnosis of Viral Diseases and Working with Viruses in the Research Laboratory" 446:* Quota cord/maternity concentrations blood. Based on data from a Japanese study on 228 mothers. 168:(the receptor with greatest affinity to IgG in humans) in order to direct marked virions to the 2142: 1925: 1643: 1579: 311: 1872: 1728: 1706: 488:
The measurement of immunoglobulin G can be a diagnostic tool for certain conditions, such as
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Gao, ZH; McAlister, VC; Wright Jr., JR; McAlister, CC; Peltekian, K; MacDonald, AS (2004).
923: 762: 604: 593:"Antibodies mediate intracellular immunity through tripartite motif-containing 21 (TRIM21)" 513: 489: 250:: antigens can cause systemic anaphylaxis in mice through classic pathway by cross-linking 203: 266:(PAF). In the alternative pathway antigens form complexes with IgG, which then cross-link 8: 2147: 1994: 1949: 1884: 1867: 1701: 1619: 1540: 86: 17: 927: 766: 608: 1769: 1515: 1298: 1273: 1208: 1181: 1162: 1105: 1070: 1046: 1011: 992: 887: 852: 785: 750: 686: 651: 627: 592: 568: 533: 116:
IgG-mediated binding of pathogens causes their immobilization and binding together via
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and maturation of the antibody response, thus they participate predominantly in the
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Finkelman, Fred D. (September 2007). "Anaphylaxis: Lessons from mouse models".
751:"Identification of markers that distinguish IgE-from IgG mediated anaphylaxis" 2136: 1827: 1716: 1503: 1198: 1096: 1087: 1037: 945: 878: 831: 677: 668: 559: 550: 299:. The two heavy chains are linked to each other and to a light chain each by 232: 188: 62: 1479: 1271: 1028: 869: 775: 617: 199: 1794: 1779: 1774: 1711: 1609: 1511: 1464: 1338: 1307: 1258: 1217: 1158: 1114: 1055: 1012:"Monitoring of Immunoglobulin N- and O-glycosylation in Health and Disease" 988: 980: 896: 794: 735: 695: 636: 591:
Mallery DL, McEwan WA, Bidgood SR, Towers GJ, Johnson CM, James LC (2010).
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IgG is secreted as a monomer that is small in size allowing it to easily
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antibodies in humans, IgG is the most common type of antibody found in
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Khondoun MV, Strait R, Armstrong L, Yanase N, Finkelman FD (2011).
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but can mediate systemic anaphylaxis induced by larger quantities.
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A booklet with everything you wanted to know about IgG subclasses
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Janeway Immunobiology – The structure of a typical antibody (IgG)
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de Haan, Noortje; Falck, David; Wuhrer, Manfred (2019-07-08).
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Vidarsson, Gestur; Dekkers, Gillian; Rispens, Theo (2014).
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Vidarsson, Gestur; Dekkers, Gillian; Rispens, Theo (2014).
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Vidarsson, Gestur; Dekkers, Gillian; Rispens, Theo (2014).
1373:(2nd ed.). Jones & Bartlett Publishers. pp.  590: 227:, residual IgG absorbed through the placenta provides the 1182:"A temporal model of human IgE and IgG antibody function" 1180:
Collins, Andrew M.; Katherine J.L. Jackson (2013-08-09).
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Janeway CA Jr; Travers P; Walport M; et al. (2001).
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Immunobiology: The Immune System in Health and Disease
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Proceedings of the National Academy of Sciences, USA
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Proceedings of the National Academy of Sciences, USA
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The water-accessible surface area of an IgG antibody
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American Academy of Allergy, Asthma, and Immunology
709: 707: 705: 1009: 270:receptor FcγRIII and stimulates only PAF release. 128:leading to the elimination of the pathogen itself; 1127:Bonilla FA Immuno Allergy Clin N Am 2008; 803–819 175:IgG is also associated with type II and type III 2134: 702: 290:The various regions and domains of a typical IgG 258:receptor FcεRI, stimulating the release of both 143:production that results in pathogen elimination; 310:The Fc regions of IgGs bear a highly conserved 2002: 1561: 158:antibody-dependent cell-mediated cytotoxicity 120:; IgG coating of pathogen surfaces (known as 1435: 496:, and varicella (chickenpox), among others. 124:) allows their recognition and ingestion by 81:. IgG is the main type of antibody found in 61:. IgG molecules are created and released by 584: 162:intracellular antibody-mediated proteolysis 89:, allowing it to control infection of body 2009: 1995: 1568: 1554: 1445:Annals of Allergy, Asthma & Immunology 1362: 1173: 816:(5th ed.). New York: Garland Science. 716:Journal of Allergy and Clinical Immunology 1391: 1356: 1314: 1297: 1248: 1207: 1197: 1104: 1086: 1045: 1027: 935: 886: 868: 784: 774: 713: 685: 667: 626: 616: 567: 549: 112:It does this through several mechanisms: 476: 285: 206:to facilitate passage through the human 109:, IgG protects the body from infection. 29: 183:IgG antibodies are generated following 14: 2135: 1407:Choosing Wisely: an initiative of the 1327:Clinical and Experimental Rheumatology 210:, thereby providing protection to the 1990: 1549: 231:with humoral immunity before its own 850: 472: 156:IgG also plays an important role in 53:. Representing approximately 75% of 77:Antibodies are major components of 24: 25: 2159: 1529: 1496:10.1111/j.1398-9995.2008.01705.x 1278:Journal of Experimental Medicine 1151:10.1046/j.1442-200x.2000.01245.x 1471: 1265: 1224: 1130: 1121: 1062: 1003: 960: 2016: 1895:Immunoglobulin class switching 903: 844: 820: 801: 742: 643: 525: 198:into tissues. It is the only 13: 1: 1457:10.1016/s1081-1206(10)60220-7 851:Cobb, Brian A. (2019-08-27). 519: 318: 281: 65:. Each IgG antibody has two 7: 502: 93:. By binding many kinds of 72: 10: 2164: 1724:Polyclonal B cell response 1363:Teri Shors (August 2011). 728:10.1016/j.jaci.2007.07.033 264:platelet activating factor 2065: 2024: 1958: 1916: 1858: 1759: 1689: 1597: 1590: 444: 189:secondary immune response 1199:10.3389/fimmu.2013.00235 1139:Pediatrics International 1088:10.3389/fimmu.2014.00520 669:10.3389/fimmu.2014.00520 551:10.3389/fimmu.2014.00520 1186:Frontiers in Immunology 1075:Frontiers in Immunology 776:10.1073/pnas.1105695108 656:Frontiers in Immunology 618:10.1073/pnas.1014074107 538:Frontiers in Immunology 164:, in which it binds to 126:phagocytic immune cells 1838:Tolerance in pregnancy 1580:adaptive immune system 981:10.1002/pmic.200700968 485: 393:extremely low affinity 291: 139:, a cascade of immune 35: 1873:Somatic hypermutation 1707:Polyclonal antibodies 1702:Monoclonal antibodies 1370:Understanding Viruses 1237:Liver Transplantation 1029:10.1093/glycob/cwz048 870:10.1093/glycob/cwz065 480: 437:intermediate affinity 289: 33: 2121:Heavy-chain antibody 1890:Junctional diversity 1658:Antigen presentation 1290:10.1084/jem.20012024 514:IgG4-related disease 490:autoimmune hepatitis 342:Complement activator 1885:V(D)J recombination 1868:Affinity maturation 1620:Antigenic variation 1423:on November 3, 2012 928:1985Natur.316..452P 767:2011PNAS..10812413K 761:(30): 12413–12418. 609:2010PNAS..10719985M 603:(46): 19985–19990. 484:is an IgG antibody. 349:on phagocytic cells 146:IgG also binds and 87:extracellular fluid 486: 292: 131:IgG activates the 36: 2130: 2129: 1984: 1983: 1912: 1911: 1662:professional APCs 1384:978-0-7637-8553-6 975:(14): 2858–2871. 922:(6027): 452–457. 828:"Antibody Basics" 494:hepatitis B virus 473:Role in diagnosis 451: 450: 137:complement system 133:classical pathway 59:blood circulation 16:(Redirected from 2155: 2011: 2004: 1997: 1988: 1987: 1878:Clonal selection 1850:Immune privilege 1845:Immunodeficiency 1800:Cross-reactivity 1790:Hypersensitivity 1595: 1594: 1570: 1563: 1556: 1547: 1546: 1524: 1523: 1475: 1469: 1468: 1439: 1433: 1432: 1430: 1428: 1422: 1416:. Archived from 1404: 1395: 1389: 1388: 1360: 1354: 1353: 1351: 1350: 1341:. Archived from 1318: 1312: 1311: 1301: 1269: 1263: 1262: 1252: 1250:10.1002/lt.20154 1243:(8): 1055–1059. 1228: 1222: 1221: 1211: 1201: 1177: 1171: 1170: 1134: 1128: 1125: 1119: 1118: 1108: 1090: 1066: 1060: 1059: 1049: 1031: 1007: 1001: 1000: 964: 958: 957: 939: 937:10.1038/316452a0 907: 901: 900: 890: 872: 848: 842: 841: 839: 838: 824: 818: 817: 805: 799: 798: 788: 778: 746: 740: 739: 711: 700: 699: 689: 671: 647: 641: 640: 630: 620: 588: 582: 581: 571: 553: 529: 326: 325: 223:secreted in the 200:antibody isotype 177:hypersensitivity 79:humoral immunity 39:Immunoglobulin G 27:Antibody isotype 21: 2163: 2162: 2158: 2157: 2156: 2154: 2153: 2152: 2133: 2132: 2131: 2126: 2061: 2020: 2015: 1985: 1980: 1954: 1908: 1854: 1833:Clonal deletion 1761: 1755: 1685: 1586: 1574: 1532: 1527: 1476: 1472: 1440: 1436: 1426: 1424: 1420: 1409:ABIM Foundation 1402: 1396: 1392: 1385: 1361: 1357: 1348: 1346: 1319: 1315: 1270: 1266: 1229: 1225: 1178: 1174: 1135: 1131: 1126: 1122: 1067: 1063: 1008: 1004: 965: 961: 908: 904: 849: 845: 836: 834: 826: 825: 821: 806: 802: 747: 743: 712: 703: 648: 644: 589: 585: 530: 526: 522: 505: 475: 321: 312:N-glycosylation 301:disulfide bonds 284: 185:class switching 172:in the cytosol; 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Along with 218: 217: 213: 209: 205: 201: 197: 192: 190: 186: 178: 174: 171: 167: 163: 159: 155: 152: 149: 145: 142: 138: 134: 130: 127: 123: 119: 118:agglutination 115: 114: 113: 110: 108: 104: 100: 96: 92: 88: 84: 80: 70: 68: 64: 60: 56: 52: 48: 44: 40: 32: 19: 2089: 2046: 1795:Inflammation 1780:Alloimmunity 1775:Autoimmunity 1760:Immunity vs. 1712:Autoantibody 1610:Superantigen 1487: 1483: 1473: 1448: 1444: 1437: 1425:. Retrieved 1418:the original 1406: 1393: 1369: 1358: 1347:. Retrieved 1343:the original 1330: 1326: 1316: 1281: 1277: 1267: 1240: 1236: 1226: 1189: 1185: 1175: 1142: 1138: 1132: 1123: 1078: 1074: 1064: 1019: 1016:Glycobiology 1015: 1005: 972: 968: 962: 919: 915: 905: 860: 857:Glycobiology 856: 846: 835:. Retrieved 822: 813: 803: 758: 754: 744: 719: 715: 659: 655: 645: 600: 596: 586: 541: 537: 527: 498: 487: 467:Fc receptors 463: 460: 456: 452: 445: 322: 309: 293: 272: 245: 241: 214: 193: 182: 122:opsonization 111: 76: 42: 38: 37: 2104:Heavy chain 2073:Light chain 1918:Lymphocytes 1577:Lymphocytic 431:yes (1.15)* 409:yes (1.17)* 365:yes (1.47)* 347:Fc receptor 248:anaphylaxis 225:breast milk 160:(ADCC) and 148:neutralizes 2148:Antibodies 2137:Categories 2025:Main types 2018:Antibodies 1959:Substances 1823:Peripheral 1811:Inaction: 1690:Antibodies 1671:Macrophage 1584:complement 1427:August 14, 1349:2014-02-26 969:Proteomics 837:2014-12-10 520:References 482:Adalimumab 352:Half life 332:Percentage 319:Subclasses 268:macrophage 235:develops. 179:reactions. 170:proteasome 2090:surrogate 1976:Cytolysin 1966:Cytokines 1813:Tolerance 1762:tolerance 1681:Immunogen 1504:1398-9995 1097:1664-3224 1038:1460-2423 946:0028-0836 879:1460-2423 678:1664-3224 560:1664-3224 387:no (0.8)* 345:Binds to 295:150  282:Structure 260:histamine 256:mast cell 237:Colostrum 204:receptors 202:that has 95:pathogens 67:paratopes 1926:Cellular 1770:Immunity 1768:Action: 1751:Paratope 1739:Idiotype 1729:Allotype 1697:Antibody 1651:Mimotope 1615:Allergen 1598:Antigens 1591:Lymphoid 1520:14061223 1512:18489614 1465:19119701 1339:18565246 1308:11901193 1259:15390333 1218:23950757 1167:24750352 1159:10986861 1115:25368619 1056:31281930 997:22821543 989:18655055 897:31504525 795:21746933 736:17765751 696:25368619 637:21045130 578:25368619 503:See also 440:21 days 396:21 days 374:21 days 337:placenta 335:Crosses 216:in utero 208:placenta 103:bacteria 97:such as 73:Function 51:antibody 1971:Opsonin 1950:NK cell 1938:Humoral 1818:Central 1785:Allergy 1734:Isotype 1634:Epitope 1605:Antigen 1484:Allergy 1375:103–104 1299:2193744 1209:3738878 1192:: 235. 1106:4202688 1081:: 520. 1047:7225405 954:3927174 924:Bibcode 888:7109348 786:3145724 763:Bibcode 687:4202688 662:: 520. 628:2993423 605:Bibcode 569:4202688 544:: 520. 509:Epitope 418:7 days 412:highest 305:antigen 276:antigen 229:neonate 196:diffuse 141:protein 135:of the 99:viruses 91:tissues 45:) is a 2123:/IgNAR 2066:Chains 1943:B cell 1931:T cell 1676:B cell 1639:Linear 1627:Hapten 1518:  1510:  1502:  1463:  1381:  1337:  1306:  1296:  1257:  1216:  1206:  1165:  1157:  1113:  1103:  1095:  1054:  1044:  1036:  995:  987:  952:  944:  916:Nature 895:  885:  877:  793:  783:  734:  694:  684:  676:  635:  625:  576:  566:  558:  339:easily 166:TRIM21 151:toxins 105:, and 2095:IGLL1 1516:S2CID 1421:(PDF) 1403:(PDF) 1163:S2CID 993:S2CID 212:fetus 107:fungi 83:blood 55:serum 2114:IGHM 2109:IGH@ 2083:IGL@ 2078:IGK@ 1582:and 1508:PMID 1500:ISSN 1461:PMID 1429:2012 1379:ISBN 1335:PMID 1304:PMID 1255:PMID 1214:PMID 1155:PMID 1111:PMID 1093:ISSN 1052:PMID 1034:ISSN 985:PMID 950:PMID 942:ISSN 893:PMID 875:ISSN 791:PMID 732:PMID 692:PMID 674:ISSN 633:PMID 574:PMID 556:ISSN 424:IgG4 402:IgG3 380:IgG2 358:IgG1 329:Name 262:and 85:and 47:type 2057:IgY 2052:IgM 2047:IgG 2042:IgE 2037:IgD 2032:IgA 1904:HLA 1900:MHC 1492:doi 1453:doi 1449:101 1294:PMC 1286:doi 1282:195 1245:doi 1204:PMC 1194:doi 1147:doi 1101:PMC 1083:doi 1042:PMC 1024:doi 977:doi 932:doi 920:316 883:PMC 865:doi 781:PMC 771:doi 759:108 724:doi 720:120 682:PMC 664:doi 623:PMC 613:doi 601:107 564:PMC 546:doi 384:23% 362:66% 297:kDa 252:IgE 221:IgA 191:. 49:of 43:IgG 18:IgG 2139:: 1664:: 1514:. 1506:. 1498:. 1488:63 1486:. 1482:. 1459:. 1447:. 1412:. 1405:. 1377:. 1367:. 1331:26 1329:. 1325:. 1302:. 1292:. 1280:. 1276:. 1253:. 1241:10 1239:. 1235:. 1212:. 1202:. 1188:. 1184:. 1161:. 1153:. 1143:42 1141:. 1109:. 1099:. 1091:. 1077:. 1073:. 1050:. 1040:. 1032:. 1020:30 1018:. 1014:. 991:. 983:. 971:. 948:. 940:. 930:. 918:. 914:. 891:. 881:. 873:. 861:30 859:. 855:. 830:. 812:. 789:. 779:. 769:. 757:. 753:. 730:. 718:. 704:^ 690:. 680:. 672:. 658:. 654:. 631:. 621:. 611:. 599:. 595:. 572:. 562:. 554:. 540:. 536:. 469:. 434:no 428:4% 406:7% 101:, 69:. 2010:e 2003:t 1996:v 1902:/ 1660:/ 1569:e 1562:t 1555:v 1522:. 1494:: 1467:. 1455:: 1431:. 1387:. 1352:. 1310:. 1288:: 1261:. 1247:: 1220:. 1196:: 1190:4 1169:. 1149:: 1117:. 1085:: 1079:5 1058:. 1026:: 999:. 979:: 973:8 956:. 934:: 926:: 899:. 867:: 840:. 797:. 773:: 765:: 738:. 726:: 698:. 666:: 660:5 639:. 615:: 607:: 580:. 548:: 542:5 153:; 41:( 20:)

Index

IgG

type
antibody
serum
blood circulation
plasma B cells
paratopes
humoral immunity
blood
extracellular fluid
tissues
pathogens
viruses
bacteria
fungi
agglutination
opsonization
phagocytic immune cells
classical pathway
complement system
protein
neutralizes
toxins
antibody-dependent cell-mediated cytotoxicity
intracellular antibody-mediated proteolysis
TRIM21
proteasome
hypersensitivity
class switching

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