Interleukin-12 (IL12) is a heterodimer of interleukin 12 alpha subunit (IL12A, IL-12p35) and interleukin 12 beta subunit (IL12B, IL-12p40) that binds the Interleukin 12 receptor, which is a heterodimer of Interleukin 12 receptor alpha subunit (IL12RB1) and Interleukin 12 beta subunit (IL12RB2) (Chua et al. 1994, Yoon et al. 2000, Chizzonite et al. 1992 , Gubler et al. 1991). The data from cross linking and surface labeling experiments suggest that only heterodimeric receptors bind IL12.Dimerization of the receptor does not depend on IL12 binding to the receptor subunits but if the IL12 is pre-bound to either receptor subunit, the resulting binding pattern does not change (Chua et al. 1994). Regulation: IL12B monomer can be secreted and interact with the Interleukin 12 receptor. Human IL12B homodimers can be produced by cells containing expression constructs (Ling et al. 1995, Alloza & Vandenbroeck 2015) but not under natural conditions (Carra et al. 2000). IL12B homodimers do not mediate biological activity, rather they act as a competitive antagonist by competition with IL12 (Ling et al. 1995).
Truitt, T, Stern, AS, Chizzonite, R, Nunes, P, Gately, MK, Desai, BB, Podlaski, FJ
Quinn, PM, McComas, W, Wolitzky, AG, Motyka, R, Gubler, U, Nabavi, N, Dwyer, CM, Schoenhaut, DS, Chua, AO, Familletti, PC
Presky, DH, Minetti, LJ, Chizzonite, R, Chua, AO, Nunes, P, Gately, MK, Desai, BB, Levine, JF, Warrier, RR, Truitt, TP
Tobin, JF, Yoon, C, Tang, J, Stahl, M, Johnston, SC, Somers, WS
Stern, AS, Hollfelder, K, Su, C, Hakimi, J, Gubler, U, Gately, MK, Lin, P, Pan, YC, Ling, P
© 2023 Reactome
