Structure of a Janus kinase cytokine receptor complex reveals the basis for dimeric activation.
Structure of a Janus kinase cytokine receptor complex reveals the basis for dimeric activation.
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DOI:
10.1126/science.abn8933
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发表时间:
2022-04-08
期刊:
影响因子:
56.9
通讯作者:
Garcia, K. Christopher
中科院分区:
文献类型:
--
作者:
Glassman, Caleb R.;Tsutsumi, Naotaka;Saxton, Robert A.;Lupardus, Patrick J.;Jude, Kevin M.;Garcia, K. Christopher
Cytokines signal through cell surface receptor dimers to initiate activation of intracellular Janus Kinases (JAKs). We report the 3.6Å resolution cryo-EM structure of full-length JAK1 complexed with a cytokine receptor intracellular Box1/Box2 domain, captured as an activated homodimer bearing the Val→Phe (VF) mutation prevalent in myeloproliferative neoplasms. The seven domains of JAK1 form an extended structural unit whose dimerization is mediated by close-packed pseudokinase (PK) domains. The oncogenic VF mutation lies within the core of the JAK1 PK dimer interface, enhancing packing complementarity to facilitate ligand-independent activation. The C-terminal tyrosine kinase domains are poised to phosphorylate the receptor STAT-recruiting motifs projecting from the overhanging FERM-SH2 domains. Mapping of constitutively active JAK mutants supports a two-step allosteric activation mechanism and reveals new opportunities for selective therapeutic targeting of oncogenic JAK signaling. Cryo-EM structure of JAK1 cytokine receptor complex reveals a mechanism of dimeric activation exploited by oncogenic mutation.
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DOI:
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期刊:
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DOI:
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发表时间:
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影响因子:
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