In response to Interleukin-13 ( IL13) binding, Janus kinase 1 (JAK1) binds to Interleukin-4 receptor alpha subunit (IL4R) (Roy et al. 2002). IL4R has 2 JAK binding motifs so it is believed that IL4R can bind JAK2 constitutively and additionally bind JAK1 upon ligand binding. The molecular trigger for JAK1 binding is not clear.
Roy, B, Ford, D, Maizel, AL, Cathcart, MK, Bhattacharjee, A, Xu, B
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