4ixp

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{{STRUCTURE_4ixp| PDB=4ixp | SCENE= }}
 
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===Crystal structure of Maternal Embryonic Leucine Zipper Kinase (MELK)===
 
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{{ABSTRACT_PUBMED_23922895}}
 
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==Disease==
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==Crystal structure of Maternal Embryonic Leucine Zipper Kinase (MELK)==
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[[http://www.uniprot.org/uniprot/MELK_HUMAN MELK_HUMAN]] Note=Defects in MELK are associated with some cancers, such as brain or breast cancers. Expression is dramatically increased in aggressive undifferentiated tumors, correlating with poor patient outcome in breast and brain cancers, suggesting a role in tumor-initiating cells and proliferation via its function in cell proliferation regulation.
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<StructureSection load='4ixp' size='340' side='right'caption='[[4ixp]], [[Resolution|resolution]] 2.75&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[4ixp]] 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=4IXP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4IXP FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.749&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4ixp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ixp OCA], [https://pdbe.org/4ixp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ixp RCSB], [https://www.ebi.ac.uk/pdbsum/4ixp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ixp ProSAT]</span></td></tr>
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</table>
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== Disease ==
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[https://www.uniprot.org/uniprot/MELK_HUMAN MELK_HUMAN] Note=Defects in MELK are associated with some cancers, such as brain or breast cancers. Expression is dramatically increased in aggressive undifferentiated tumors, correlating with poor patient outcome in breast and brain cancers, suggesting a role in tumor-initiating cells and proliferation via its function in cell proliferation regulation.
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== Function ==
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[https://www.uniprot.org/uniprot/MELK_HUMAN MELK_HUMAN] Serine/threonine-protein kinase involved in various processes such as cell cycle regulation, self-renewal of stem cells, apoptosis and splicing regulation. Has a broad substrate specificity; phosphorylates BCL2L14, CDC25B, MAP3K5/ASK1 and ZNF622. Acts as an activator of apoptosis by phosphorylating and activating MAP3K5/ASK1. Acts as a regulator of cell cycle, notably by mediating phosphorylation of CDC25B, promoting localization of CDC25B to the centrosome and the spindle poles during mitosis. Plays a key role in cell proliferation and carcinogenesis. Required for proliferation of embryonic and postnatal multipotent neural progenitors. Phosphorylates and inhibits BCL2L14, possibly leading to affect mammary carcinogenesis by mediating inhibition of the pro-apoptotic function of BCL2L14. Also involved in the inhibition of spliceosome assembly during mitosis by phosphorylating ZNF622, thereby contributing to its redirection to the nucleus. May also play a role in primitive hematopoiesis.<ref>PMID:11802789</ref> <ref>PMID:12400006</ref> <ref>PMID:14699119</ref> <ref>PMID:15908796</ref> <ref>PMID:16216881</ref> <ref>PMID:17280616</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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MELK (maternal embryonic leucine zipper kinase), which is a member of the AMPK (AMP-activated protein kinase)-related kinase family, plays important roles in diverse cellular processes and has become a promising drug target for certain cancers. However, the regulatory mechanism of MELK remains elusive. Here, we report the crystal structure of a fragment of human MELK that contains the kinase domain and ubiquitin-associated (UBA) domain. The UBA domain tightly binds to the back of the kinase domain, which may contribute to the proper conformation and activity of the kinase domain. Interestingly, the activation segment in the kinase domain displays a unique conformation that contains an intramolecular disulfide bond. The structural and biochemical analyses unravel the molecular mechanisms for the autophosphorylation/activation of MELK and the dependence of its catalytic activity on reducing agents. Thus, our results may provide the basis for designing specific MELK inhibitors for cancer treatment.
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==Function==
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Structural basis for the regulation of maternal embryonic leucine zipper kinase.,Cao LS, Wang J, Chen Y, Deng H, Wang ZX, Wu JW PLoS One. 2013 Jul 26;8(7):e70031. doi: 10.1371/journal.pone.0070031. Print 2013. PMID:23922895<ref>PMID:23922895</ref>
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[[http://www.uniprot.org/uniprot/MELK_HUMAN MELK_HUMAN]] Serine/threonine-protein kinase involved in various processes such as cell cycle regulation, self-renewal of stem cells, apoptosis and splicing regulation. Has a broad substrate specificity; phosphorylates BCL2L14, CDC25B, MAP3K5/ASK1 and ZNF622. Acts as an activator of apoptosis by phosphorylating and activating MAP3K5/ASK1. Acts as a regulator of cell cycle, notably by mediating phosphorylation of CDC25B, promoting localization of CDC25B to the centrosome and the spindle poles during mitosis. Plays a key role in cell proliferation and carcinogenesis. Required for proliferation of embryonic and postnatal multipotent neural progenitors. Phosphorylates and inhibits BCL2L14, possibly leading to affect mammary carcinogenesis by mediating inhibition of the pro-apoptotic function of BCL2L14. Also involved in the inhibition of spliceosome assembly during mitosis by phosphorylating ZNF622, thereby contributing to its redirection to the nucleus. May also play a role in primitive hematopoiesis.<ref>PMID:11802789</ref> <ref>PMID:12400006</ref> <ref>PMID:14699119</ref> <ref>PMID:15908796</ref> <ref>PMID:16216881</ref> <ref>PMID:17280616</ref>
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[4ixp]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IXP OCA].
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</div>
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<div class="pdbe-citations 4ixp" style="background-color:#fffaf0;"></div>
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==Reference==
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== References ==
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<ref group="xtra">PMID:023922895</ref><references group="xtra"/><references/>
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Cao, L S.]]
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[[Category: Large Structures]]
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[[Category: Wang, J.]]
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[[Category: Cao LS]]
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[[Category: Wang, Z X.]]
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[[Category: Wang J]]
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[[Category: Wu, J W.]]
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[[Category: Wang ZX]]
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[[Category: Protein kinase]]
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[[Category: Wu JW]]
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[[Category: Regulated by phosphorylation]]
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[[Category: Transferase]]
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Current revision

Crystal structure of Maternal Embryonic Leucine Zipper Kinase (MELK)

PDB ID 4ixp

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