View source for 5wfj


==THE JAK3 KINASE DOMAIN IN COMPLEX WITH A COVALENT INHIBITOR==
<StructureSection load='5wfj' size='340' side='right'caption='[[5wfj]], [[Resolution|resolution]] 2.48&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5wfj]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5WFJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5WFJ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.48&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=9Z4:4-[[3-(propanoylamino)phenyl]methylamino]pyrrolo[1,2-b]pyridazine-3-carboxamide'>9Z4</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5wfj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5wfj OCA], [https://pdbe.org/5wfj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5wfj RCSB], [https://www.ebi.ac.uk/pdbsum/5wfj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5wfj ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/JAK3_HUMAN JAK3_HUMAN] Defects in JAK3 are a cause of severe combined immunodeficiency autosomal recessive T-cell-negative/B-cell-positive/NK-cell-negative (T(-)B(+)NK(-) SCID) [MIM:[https://omim.org/entry/600802 600802]. A form of severe combined immunodeficiency (SCID), a genetically and clinically heterogeneous group of rare congenital disorders characterized by impairment of both humoral and cell-mediated immunity, leukopenia, and low or absent antibody levels. Patients present in infancy recurrent, persistent infections by opportunistic organisms. The common characteristic of all types of SCID is absence of T-cell-mediated cellular immunity due to a defect in T-cell development.<ref>PMID:15121872</ref> <ref>PMID:18250158</ref> <ref>PMID:15831699</ref> [:]<ref>PMID:7659163</ref> <ref>PMID:9354668</ref> <ref>PMID:9753072</ref> <ref>PMID:10982185</ref> <ref>PMID:14615376</ref> 
== Function ==
[https://www.uniprot.org/uniprot/JAK3_HUMAN JAK3_HUMAN] Non-receptor tyrosine kinase involved in various processes such as cell growth, development, or differentiation. Mediates essential signaling events in both innate and adaptive immunity and plays a crucial role in hematopoiesis during T-cells development. In the cytoplasm, plays a pivotal role in signal transduction via its association with type I receptors sharing the common subunit gamma such as IL2R, IL4R, IL7R, IL9R, IL15R and IL21R. Following ligand binding to cell surface receptors, phosphorylates specific tyrosine residues on the cytoplasmic tails of the receptor, creating docking sites for STATs proteins. Subsequently, phosphorylates the STATs proteins once they are recruited to the receptor. Phosphorylated STATs then form homodimer or heterodimers and translocate to the nucleus to activate gene transcription. For example, upon IL2R activation by IL2, JAK1 and JAK3 molecules bind to IL2R beta (IL2RB) and gamma chain (IL2RG) subunits inducing the tyrosine phosphorylation of both receptor subunits on their cytoplasmic domain. Then, STAT5A AND STAT5B are recruited, phosphorylated and activated by JAK1 and JAK3. Once activated, dimerized STAT5 translocates to the nucleus and promotes the transcription of specific target genes in a cytokine-specific fashion.<ref>PMID:8022485</ref> <ref>PMID:7662955</ref> <ref>PMID:20440074</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
A useful and novel set of tool molecules have been identified which bind irreversibly to the JAK3 active site cysteine residue. The design was based on crystal structure information and a comparative study of several electrophilic warheads.

Discovery of highly potent, selective, covalent inhibitors of JAK3.,Kempson J, Ovalle D, Guo J, Wrobleski ST, Lin S, Spergel SH, Duan JJ, Jiang B, Lu Z, Das J, Yang BV, Hynes J Jr, Wu H, Tokarski J, Sack JS, Khan J, Schieven G, Blatt Y, Chaudhry C, Salter-Cid LM, Fura A, Barrish JC, Carter PH, Pitts WJ Bioorg Med Chem Lett. 2017 Oct 15;27(20):4622-4625. doi:, 10.1016/j.bmcl.2017.09.023. Epub 2017 Sep 11. PMID:28927786<ref>PMID:28927786</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5wfj" style="background-color:#fffaf0;"></div>

==See Also==
*[[Janus kinase 3D structures|Janus kinase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Sack J]]