Title : ATP binding to the pseudokinase domain of JAK2 is critical for pathogenic activation.

Pub. Date : 2015 Apr 14

PMID : 25825724






7 Functional Relationships(s)
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Protein Name
Organism
1 JH2 of JAK1, JAK2, and TYK2 all bind ATP, but the significance of this is unclear. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus
2 Disruption of JH2 ATP binding in wild-type JAK2 has only minor effects, and in the presence of type I cytokine receptors, the mutations do not affect JAK2 activation. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus
3 However, JH2 mutants devoid of ATP binding ameliorate the hyperactivation of JAK2 V617F. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus
4 Disrupting ATP binding in JH2 also inhibits the hyperactivity of other pathogenic JAK2 mutants, as well as of JAK1 V658F, and prevents induction of erythrocytosis in a JAK2 V617F myeloproliferative neoplasm mouse model. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus
5 Molecular dynamic simulations and thermal-shift analysis indicate that ATP binding stabilizes JH2, with a pronounced effect on the C helix region, which plays a critical role in pathogenic activation of JAK2. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus
6 Taken together, our results suggest that ATP binding to JH2 serves a structural role in JAKs, which is required for aberrant activity of pathogenic JAK mutants. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus
7 The inhibitory effect of abrogating JH2 ATP binding in pathogenic JAK mutants may warrant novel therapeutic approaches. Adenosine Triphosphate immunoglobulin heavy variable 1-53 Mus musculus