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| | ==Phenylalanine Zipper Mediates APS Dimerization== | | ==Phenylalanine Zipper Mediates APS Dimerization== |
| - | <StructureSection load='1q2h' size='340' side='right' caption='[[1q2h]], [[Resolution|resolution]] 1.70Å' scene=''> | + | <StructureSection load='1q2h' size='340' side='right'caption='[[1q2h]], [[Resolution|resolution]] 1.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1q2h]] is a 3 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=1Q2H OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1Q2H FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1q2h]] is a 3 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=1Q2H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1Q2H FirstGlance]. <br> |
| - | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">APS ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7Å</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=1q2h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q2h OCA], [http://pdbe.org/1q2h PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q2h RCSB], [http://www.ebi.ac.uk/pdbsum/1q2h PDBsum]</span></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=1q2h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q2h OCA], [https://pdbe.org/1q2h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1q2h RCSB], [https://www.ebi.ac.uk/pdbsum/1q2h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1q2h ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SH2B2_HUMAN SH2B2_HUMAN]] Adapter protein for several members of the tyrosine kinase receptor family. Involved in multiple signaling pathways. May be involved in coupling from immunoreceptor to Ras signaling. Acts as a negative regulator of cytokine signaling in collaboration with CBL. Binds to EPOR and suppresses EPO-induced STAT5 activation, possibly through a masking effect on STAT5 docking sites in EPOR. Suppresses PDGF-induced mitogenesis. May induce cytoskeletal reorganization via interaction with VAV3.<ref>PMID:10374881</ref> <ref>PMID:9989826</ref> <ref>PMID:12400014</ref> <ref>PMID:15378031</ref> | + | [https://www.uniprot.org/uniprot/SH2B2_HUMAN SH2B2_HUMAN] Adapter protein for several members of the tyrosine kinase receptor family. Involved in multiple signaling pathways. May be involved in coupling from immunoreceptor to Ras signaling. Acts as a negative regulator of cytokine signaling in collaboration with CBL. Binds to EPOR and suppresses EPO-induced STAT5 activation, possibly through a masking effect on STAT5 docking sites in EPOR. Suppresses PDGF-induced mitogenesis. May induce cytoskeletal reorganization via interaction with VAV3.<ref>PMID:10374881</ref> <ref>PMID:9989826</ref> <ref>PMID:12400014</ref> <ref>PMID:15378031</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
| | Check<jmol> | | Check<jmol> |
| | <jmolCheckbox> | | <jmolCheckbox> |
| - | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/q2/1q2h_consurf.spt"</scriptWhenChecked> | + | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/q2/1q2h_consurf.spt"</scriptWhenChecked> |
| | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | <text>to colour the structure by Evolutionary Conservation</text> | | <text>to colour the structure by Evolutionary Conservation</text> |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Chi, Y I]] | + | [[Category: Large Structures]] |
| - | [[Category: Dhe-Paganon, S]] | + | [[Category: Chi Y-I]] |
| - | [[Category: Nishi, M]] | + | [[Category: Dhe-Paganon S]] |
| - | [[Category: Shoelson, S E]] | + | [[Category: Nishi M]] |
| - | [[Category: Werner, E D]] | + | [[Category: Shoelson SE]] |
| - | [[Category: Signal transduction]]
| + | [[Category: Werner ED]] |
| - | [[Category: Signaling protein]]
| + | |
| Structural highlights
Function
SH2B2_HUMAN Adapter protein for several members of the tyrosine kinase receptor family. Involved in multiple signaling pathways. May be involved in coupling from immunoreceptor to Ras signaling. Acts as a negative regulator of cytokine signaling in collaboration with CBL. Binds to EPOR and suppresses EPO-induced STAT5 activation, possibly through a masking effect on STAT5 docking sites in EPOR. Suppresses PDGF-induced mitogenesis. May induce cytoskeletal reorganization via interaction with VAV3.[1] [2] [3] [4]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The APS, SH2-B and LNK proteins are adapters that activate and modulate receptor tyrosine kinase and JAK/STAT signaling. We now show that a conserved N-terminal domain mediates APS homodimerization. We determined the crystal structure of the dimerization domain at a resolution of 1.7 A using bromide ion MAD phasing. Each molecule contributes two helices to a compact four-helix bundle having a bisecting-U topology. Its most conspicuous feature is a stack of interdigitated phenylalanine side chains at the domain core. These residues create a new motif we refer to as a 'phenylalanine zipper,' which is critical to dimerization. A newly developed bridging yeast tri-hybrid assay showed that APS dimerizes JAK2, insulin receptor and IGF1 receptor kinases using its SH2 and dimerization domains. Dimerization via the phenylalanine zipper domain provides a mechanism for activating and modulating tyrosine kinase activity even in the absence of extracellular ligands.
A phenylalanine zipper mediates APS dimerization.,Dhe-Paganon S, Werner ED, Nishi M, Hansen L, Chi YI, Shoelson SE Nat Struct Mol Biol. 2004 Oct;11(10):968-74. Epub 2004 Sep 19. PMID:15378031[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Wakioka T, Sasaki A, Mitsui K, Yokouchi M, Inoue A, Komiya S, Yoshimura A. APS, an adaptor protein containing Pleckstrin homology (PH) and Src homology-2 (SH2) domains inhibits the JAK-STAT pathway in collaboration with c-Cbl. Leukemia. 1999 May;13(5):760-7. PMID:10374881
- ↑ Yokouchi M, Wakioka T, Sakamoto H, Yasukawa H, Ohtsuka S, Sasaki A, Ohtsubo M, Valius M, Inoue A, Komiya S, Yoshimura A. APS, an adaptor protein containing PH and SH2 domains, is associated with the PDGF receptor and c-Cbl and inhibits PDGF-induced mitogenesis. Oncogene. 1999 Jan 21;18(3):759-67. PMID:9989826 doi:http://dx.doi.org/10.1038/sj.onc.1202326
- ↑ Yabana N, Shibuya M. Adaptor protein APS binds the NH2-terminal autoinhibitory domain of guanine nucleotide exchange factor Vav3 and augments its activity. Oncogene. 2002 Oct 31;21(50):7720-9. PMID:12400014 doi:http://dx.doi.org/10.1038/sj.onc.1205927
- ↑ Dhe-Paganon S, Werner ED, Nishi M, Hansen L, Chi YI, Shoelson SE. A phenylalanine zipper mediates APS dimerization. Nat Struct Mol Biol. 2004 Oct;11(10):968-74. Epub 2004 Sep 19. PMID:15378031 doi:10.1038/nsmb829
- ↑ Dhe-Paganon S, Werner ED, Nishi M, Hansen L, Chi YI, Shoelson SE. A phenylalanine zipper mediates APS dimerization. Nat Struct Mol Biol. 2004 Oct;11(10):968-74. Epub 2004 Sep 19. PMID:15378031 doi:10.1038/nsmb829
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