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Title: Receptor-mediated dimerization of JAK2 FERM domains is required for JAK2 activation

Journal Article · · eLife
DOI:https://doi.org/10.7554/elife.38089· OSTI ID:1628888

Cytokines and interferons initiate intracellular signaling via receptor dimerization and activation of Janus kinases (JAKs). How JAKs structurally respond to changes in receptor conformation induced by ligand binding is not known. Here, we present two crystal structures of the human JAK2 FERM and SH2 domains bound to Leptin receptor (LEPR) and Erythropoietin receptor (EPOR), which identify a novel dimeric conformation for JAK2. This 2:2 JAK2/receptor dimer, observed in both structures, identifies a previously uncharacterized receptor interaction essential to dimer formation that is mediated by a membrane-proximal peptide motif called the ‘switch’ region. Mutation of the receptor switch region disrupts STAT phosphorylation but does not affect JAK2 binding, indicating that receptor-mediated formation of the JAK2 FERM dimer is required for kinase activation. These data uncover the structural and molecular basis for how a cytokine-bound active receptor dimer brings together two JAK2 molecules to stimulate JAK2 kinase activity.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1628888
Journal Information:
eLife, Vol. 7; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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Signaling Pathways Induced by Leptin during Epithelial–Mesenchymal Transition in Breast Cancer journal November 2018
Mechanism of homodimeric cytokine receptor activation and dysregulation by oncogenic mutations text January 2019
The molecular details of cytokine signaling via the JAK/STAT pathway: Cytokine Signaling via the JAK/STAT Pathway journal November 2018
Enzymatic Characterization of Wild-Type and Mutant Janus Kinase 1 journal November 2019
Mechanism of homodimeric cytokine receptor activation and dysregulation by oncogenic mutations journal February 2020
Two common disease-associated TYK2 variants impact exon splicing and TYK2 dosage journal January 2020
Manipulation of JAK/STAT Signalling by High-Risk HPVs: Potential Therapeutic Targets for HPV-Associated Malignancies journal September 2020

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