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2qkt

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[[Image:2qkt.jpg|left|200px]]
 
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{{Structure
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==Crystal Structure of the 5th PDZ domain of InaD==
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|PDB= 2qkt |SIZE=350|CAPTION= <scene name='initialview01'>2qkt</scene>, resolution 2.05&Aring;
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<StructureSection load='2qkt' size='340' side='right'caption='[[2qkt]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[2qkt]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Drome Drome]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QKT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2QKT FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">inaD ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 DROME])</td></tr>
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|GENE= inaD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 Drosophila melanogaster])
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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=2qkt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2qkt OCA], [https://pdbe.org/2qkt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2qkt RCSB], [https://www.ebi.ac.uk/pdbsum/2qkt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2qkt ProSAT]</span></td></tr>
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}}
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</table>
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== Function ==
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'''Crystal Structure of the 5th PDZ domain of InaD'''
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[[https://www.uniprot.org/uniprot/INAD_DROME INAD_DROME]] Involved in the negative feedback regulation of the light-activated signaling cascade in photoreceptors through a calcium-mediated process. Interacts with tetrapeptide ligand located in C-terminal sequence of 3 key components of the visual cascade, tethering them and forming a macromolecular signaling phototransduction complex.<ref>PMID:7826638</ref> <ref>PMID:11342563</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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==Overview==
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qk/2qkt_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2qkt ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
The INAD scaffold organizes a multiprotein complex that is essential for proper visual signaling in Drosophila photoreceptor cells. Here we show that one of the INAD PDZ domains (PDZ5) exists in a redox-dependent equilibrium between two conformations--a reduced form that is similar to the structure of other PDZ domains, and an oxidized form in which the ligand-binding site is distorted through formation of a strong intramolecular disulfide bond. We demonstrate transient light-dependent formation of this disulfide bond in vivo and find that transgenic flies expressing a mutant INAD in which PDZ5 is locked in the reduced state display severe defects in termination of visual responses and visually mediated reflex behavior. These studies demonstrate a conformational switch mechanism for PDZ domain function and suggest that INAD behaves more like a dynamic machine rather than a passive scaffold, regulating signal transduction at the millisecond timescale through cycles of conformational change.
The INAD scaffold organizes a multiprotein complex that is essential for proper visual signaling in Drosophila photoreceptor cells. Here we show that one of the INAD PDZ domains (PDZ5) exists in a redox-dependent equilibrium between two conformations--a reduced form that is similar to the structure of other PDZ domains, and an oxidized form in which the ligand-binding site is distorted through formation of a strong intramolecular disulfide bond. We demonstrate transient light-dependent formation of this disulfide bond in vivo and find that transgenic flies expressing a mutant INAD in which PDZ5 is locked in the reduced state display severe defects in termination of visual responses and visually mediated reflex behavior. These studies demonstrate a conformational switch mechanism for PDZ domain function and suggest that INAD behaves more like a dynamic machine rather than a passive scaffold, regulating signal transduction at the millisecond timescale through cycles of conformational change.
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==About this Structure==
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Dynamic scaffolding in a G protein-coupled signaling system.,Mishra P, Socolich M, Wall MA, Graves J, Wang Z, Ranganathan R Cell. 2007 Oct 5;131(1):80-92. PMID:17923089<ref>PMID:17923089</ref>
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2QKT is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QKT OCA].
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==Reference==
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Dynamic scaffolding in a g protein-coupled signaling system., Mishra P, Socolich M, Wall MA, Graves J, Wang Z, Ranganathan R, Cell. 2007 Oct 5;131(1):80-92. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17923089 17923089]
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[[Category: Drosophila melanogaster]]
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[[Category: Single protein]]
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[[Category: Ranganathan, R.]]
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[[Category: Socolich, M.]]
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[[Category: disulfide-bond]]
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[[Category: membrane]]
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[[Category: pdz domain]]
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[[Category: peptide binding protein]]
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[[Category: scaffolding protein]]
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[[Category: sensory transduction]]
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[[Category: signaling protein]]
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[[Category: vision]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 18:26:55 2008''
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 2qkt" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Drome]]
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[[Category: Large Structures]]
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[[Category: Ranganathan, R]]
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[[Category: Socolich, M]]
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[[Category: Disulfide-bond]]
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[[Category: Membrane]]
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[[Category: Pdz domain]]
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[[Category: Peptide binding protein]]
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[[Category: Scaffolding protein]]
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[[Category: Sensory transduction]]
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[[Category: Signaling protein]]
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[[Category: Vision]]

Current revision

Crystal Structure of the 5th PDZ domain of InaD

PDB ID 2qkt

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