2y1n: Difference between revisions
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==Disease== | ==Structure of c-Cbl-ZAP-70 peptide complex== | ||
[[http://www.uniprot.org/uniprot/CBL_HUMAN CBL_HUMAN]] Defects in CBL are the cause of Noonan syndrome-like disorder with or without juvenile myelomonocytic leukemia (NSLL) [MIM:[http://omim.org/entry/613563 613563]]. A syndrome characterized by a phenotype reminiscent of Noonan syndrome. Clinical features are highly variable, including facial dysmorphism, short neck, developmental delay, hyperextensible joints and thorax abnormalities with widely spaced nipples. The facial features consist of triangular face with hypertelorism, large low-set ears, ptosis, and flat nasal bridge. Some patients manifest cardiac defects.<ref>PMID:20619386</ref> [[http://www.uniprot.org/uniprot/ZAP70_HUMAN ZAP70_HUMAN]] Defects in ZAP70 are the cause of selective T-cell defect (STCD) [MIM:[http://omim.org/entry/269840 269840]]. A form of severe combined immunodeficiency characterized by a selective absence of CD8+ T cells.<ref>PMID:8124727</ref><ref>PMID:8202713</ref><ref>PMID:11412303</ref><ref>PMID:11123350</ref><ref>PMID:18509675</ref> | <StructureSection load='2y1n' size='340' side='right' caption='[[2y1n]], [[Resolution|resolution]] 2.00Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2y1n]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Y1N OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2Y1N FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | |||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=PTR:O-PHOSPHOTYROSINE'>PTR</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2cbl|2cbl]], [[4a4b|4a4b]], [[4a4c|4a4c]], [[1m61|1m61]], [[4a49|4a49]], [[2y1m|2y1m]], [[1b47|1b47]], [[1u59|1u59]], [[1fbv|1fbv]], [[1yvh|1yvh]]</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Non-specific_protein-tyrosine_kinase Non-specific protein-tyrosine kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.10.2 2.7.10.2] </span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2y1n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2y1n OCA], [http://pdbe.org/2y1n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2y1n RCSB], [http://www.ebi.ac.uk/pdbsum/2y1n PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2y1n ProSAT]</span></td></tr> | |||
</table> | |||
== Disease == | |||
[[http://www.uniprot.org/uniprot/CBL_HUMAN CBL_HUMAN]] Defects in CBL are the cause of Noonan syndrome-like disorder with or without juvenile myelomonocytic leukemia (NSLL) [MIM:[http://omim.org/entry/613563 613563]]. A syndrome characterized by a phenotype reminiscent of Noonan syndrome. Clinical features are highly variable, including facial dysmorphism, short neck, developmental delay, hyperextensible joints and thorax abnormalities with widely spaced nipples. The facial features consist of triangular face with hypertelorism, large low-set ears, ptosis, and flat nasal bridge. Some patients manifest cardiac defects.<ref>PMID:20619386</ref> [[http://www.uniprot.org/uniprot/ZAP70_HUMAN ZAP70_HUMAN]] Defects in ZAP70 are the cause of selective T-cell defect (STCD) [MIM:[http://omim.org/entry/269840 269840]]. A form of severe combined immunodeficiency characterized by a selective absence of CD8+ T cells.<ref>PMID:8124727</ref> <ref>PMID:8202713</ref> <ref>PMID:11412303</ref> <ref>PMID:11123350</ref> <ref>PMID:18509675</ref> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/CBL_HUMAN CBL_HUMAN]] Adapter protein that functions as a negative regulator of many signaling pathways that are triggered by activation of cell surface receptors. Acts as an E3 ubiquitin-protein ligase, which accepts ubiquitin from specific E2 ubiquitin-conjugating enzymes, and then transfers it to substrates promoting their degradation by the proteasome. Recognizes activated receptor tyrosine kinases, including KIT, FLT1, FGFR1, FGFR2, PDGFRA, PDGFRB, EGFR, CSF1R, EPHA8 and KDR and terminates signaling. Recognizes membrane-bound HCK and other kinases of the SRC family and mediates their ubiquitination and degradation. Participates in signal transduction in hematopoietic cells. Plays an important role in the regulation of osteoblast differentiation and apoptosis. Essential for osteoclastic bone resorption. The Tyr-731 phosphorylated form induces the activation and recruitment of phosphatidylinositol 3-kinase to the cell membrane in a signaling pathway that is critical for osteoclast function.<ref>PMID:10514377</ref> <ref>PMID:11896602</ref> <ref>PMID:14739300</ref> <ref>PMID:15190072</ref> <ref>PMID:17509076</ref> <ref>PMID:18374639</ref> <ref>PMID:19689429</ref> <ref>PMID:21596750</ref> [[http://www.uniprot.org/uniprot/ZAP70_HUMAN ZAP70_HUMAN]] Tyrosine kinase that plays an essential role in regulation of the adaptive immune response. Regulates motility, adhesion and cytokine expression of mature T-cells, as well as thymocyte development. Contributes also to the development and activation of primary B-lymphocytes. When antigen presenting cells (APC) activate T-cell receptor (TCR), a serie of phosphorylations lead to the recruitment of ZAP70 to the doubly phosphorylated TCR component CD247/CD3Z through ITAM motif at the plasma membrane. This recruitment serves to localization to the stimulated TCR and to relieve its autoinhibited conformation. Release of ZAP70 active conformation is further stabilized by phosphorylation mediated by LCK. Subsequently, ZAP70 phosphorylates at least 2 essential adapter proteins: LAT and LCP2. In turn, a large number of signaling molecules are recruited and ultimately lead to lymphokine production, T-cell proliferation and differentiation. Furthermore, ZAP70 controls cytoskeleton modifications, adhesion and mobility of T-lymphocytes, thus ensuring correct delivery of effectors to the APC. ZAP70 is also required for TCR-CD247/CD3Z internalization and degradation through interaction with the E3 ubiquitin-protein ligase CBL and adapter proteins SLA and SLA2. Thus, ZAP70 regulates both T-cell activation switch on and switch off by modulating TCR expression at the T-cell surface. During thymocyte development, ZAP70 promotes survival and cell-cycle progression of developing thymocytes before positive selection (when cells are still CD4/CD8 double negative). Additionally, ZAP70-dependent signaling pathway may also contribute to primary B-cells formation and activation through B-cell receptor (BCR).<ref>PMID:1423621</ref> <ref>PMID:8124727</ref> <ref>PMID:8702662</ref> <ref>PMID:9489702</ref> <ref>PMID:11353765</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Cbls are RING ubiquitin ligases that attenuate receptor tyrosine kinase (RTK) signal transduction. Cbl ubiquitination activity is stimulated by phosphorylation of a linker helix region (LHR) tyrosine residue. To elucidate the mechanism of activation, we determined the structures of human CBL, a CBL-substrate peptide complex and a phosphorylated-Tyr371-CBL-E2-substrate peptide complex, and we compared them with the known structure of a CBL-E2-substrate peptide complex. Structural and biochemical analyses show that CBL adopts an autoinhibited RING conformation, where the RING's E2-binding surface associates with CBL to reduce E2 affinity. Tyr371 phosphorylation activates CBL by inducing LHR conformational changes that eliminate autoinhibition, flip the RING domain and E2 into proximity of the substrate-binding site and transform the RING domain into an enhanced E2-binding module. This activation is required for RTK ubiquitination. Our results present a mechanism for regulation of c-Cbl's activity by autoinhibition and phosphorylation-induced activation. | |||
Structural basis for autoinhibition and phosphorylation-dependent activation of c-Cbl.,Dou H, Buetow L, Hock A, Sibbet GJ, Vousden KH, Huang DT Nat Struct Mol Biol. 2012 Jan 22;19(2):184-92. doi: 10.1038/nsmb.2231. PMID:22266821<ref>PMID:22266821</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2y1n" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Ubiquitin protein ligase|Ubiquitin protein ligase]] | *[[Ubiquitin protein ligase|Ubiquitin protein ligase]] | ||
== References == | |||
== | <references/> | ||
__TOC__ | |||
[[Category: | </StructureSection> | ||
[[Category: Human]] | |||
[[Category: Non-specific protein-tyrosine kinase]] | [[Category: Non-specific protein-tyrosine kinase]] | ||
[[Category: Dou, H | [[Category: Dou, H]] | ||
[[Category: Huang, D T | [[Category: Huang, D T]] | ||
[[Category: Sibbet, G J | [[Category: Sibbet, G J]] | ||
[[Category: Ligase-transferase complex]] | [[Category: Ligase-transferase complex]] | ||
[[Category: Ubiquitin ring e3 ligase]] | [[Category: Ubiquitin ring e3 ligase]] |
Revision as of 22:29, 5 August 2016
Structure of c-Cbl-ZAP-70 peptide complexStructure of c-Cbl-ZAP-70 peptide complex
Structural highlights
Disease[CBL_HUMAN] Defects in CBL are the cause of Noonan syndrome-like disorder with or without juvenile myelomonocytic leukemia (NSLL) [MIM:613563]. A syndrome characterized by a phenotype reminiscent of Noonan syndrome. Clinical features are highly variable, including facial dysmorphism, short neck, developmental delay, hyperextensible joints and thorax abnormalities with widely spaced nipples. The facial features consist of triangular face with hypertelorism, large low-set ears, ptosis, and flat nasal bridge. Some patients manifest cardiac defects.[1] [ZAP70_HUMAN] Defects in ZAP70 are the cause of selective T-cell defect (STCD) [MIM:269840]. A form of severe combined immunodeficiency characterized by a selective absence of CD8+ T cells.[2] [3] [4] [5] [6] Function[CBL_HUMAN] Adapter protein that functions as a negative regulator of many signaling pathways that are triggered by activation of cell surface receptors. Acts as an E3 ubiquitin-protein ligase, which accepts ubiquitin from specific E2 ubiquitin-conjugating enzymes, and then transfers it to substrates promoting their degradation by the proteasome. Recognizes activated receptor tyrosine kinases, including KIT, FLT1, FGFR1, FGFR2, PDGFRA, PDGFRB, EGFR, CSF1R, EPHA8 and KDR and terminates signaling. Recognizes membrane-bound HCK and other kinases of the SRC family and mediates their ubiquitination and degradation. Participates in signal transduction in hematopoietic cells. Plays an important role in the regulation of osteoblast differentiation and apoptosis. Essential for osteoclastic bone resorption. The Tyr-731 phosphorylated form induces the activation and recruitment of phosphatidylinositol 3-kinase to the cell membrane in a signaling pathway that is critical for osteoclast function.[7] [8] [9] [10] [11] [12] [13] [14] [ZAP70_HUMAN] Tyrosine kinase that plays an essential role in regulation of the adaptive immune response. Regulates motility, adhesion and cytokine expression of mature T-cells, as well as thymocyte development. Contributes also to the development and activation of primary B-lymphocytes. When antigen presenting cells (APC) activate T-cell receptor (TCR), a serie of phosphorylations lead to the recruitment of ZAP70 to the doubly phosphorylated TCR component CD247/CD3Z through ITAM motif at the plasma membrane. This recruitment serves to localization to the stimulated TCR and to relieve its autoinhibited conformation. Release of ZAP70 active conformation is further stabilized by phosphorylation mediated by LCK. Subsequently, ZAP70 phosphorylates at least 2 essential adapter proteins: LAT and LCP2. In turn, a large number of signaling molecules are recruited and ultimately lead to lymphokine production, T-cell proliferation and differentiation. Furthermore, ZAP70 controls cytoskeleton modifications, adhesion and mobility of T-lymphocytes, thus ensuring correct delivery of effectors to the APC. ZAP70 is also required for TCR-CD247/CD3Z internalization and degradation through interaction with the E3 ubiquitin-protein ligase CBL and adapter proteins SLA and SLA2. Thus, ZAP70 regulates both T-cell activation switch on and switch off by modulating TCR expression at the T-cell surface. During thymocyte development, ZAP70 promotes survival and cell-cycle progression of developing thymocytes before positive selection (when cells are still CD4/CD8 double negative). Additionally, ZAP70-dependent signaling pathway may also contribute to primary B-cells formation and activation through B-cell receptor (BCR).[15] [16] [17] [18] [19] Publication Abstract from PubMedCbls are RING ubiquitin ligases that attenuate receptor tyrosine kinase (RTK) signal transduction. Cbl ubiquitination activity is stimulated by phosphorylation of a linker helix region (LHR) tyrosine residue. To elucidate the mechanism of activation, we determined the structures of human CBL, a CBL-substrate peptide complex and a phosphorylated-Tyr371-CBL-E2-substrate peptide complex, and we compared them with the known structure of a CBL-E2-substrate peptide complex. Structural and biochemical analyses show that CBL adopts an autoinhibited RING conformation, where the RING's E2-binding surface associates with CBL to reduce E2 affinity. Tyr371 phosphorylation activates CBL by inducing LHR conformational changes that eliminate autoinhibition, flip the RING domain and E2 into proximity of the substrate-binding site and transform the RING domain into an enhanced E2-binding module. This activation is required for RTK ubiquitination. Our results present a mechanism for regulation of c-Cbl's activity by autoinhibition and phosphorylation-induced activation. Structural basis for autoinhibition and phosphorylation-dependent activation of c-Cbl.,Dou H, Buetow L, Hock A, Sibbet GJ, Vousden KH, Huang DT Nat Struct Mol Biol. 2012 Jan 22;19(2):184-92. doi: 10.1038/nsmb.2231. PMID:22266821[20] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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