1w3b

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[[Image:1w3b.png|left|200px]]
 
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{{STRUCTURE_1w3b| PDB=1w3b | SCENE= }}
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==The superhelical TPR domain of O-linked GlcNAc transferase reveals structural similarities to importin alpha.==
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<StructureSection load='1w3b' size='340' side='right'caption='[[1w3b]], [[Resolution|resolution]] 2.85&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1w3b]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The September 2011 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''O-GlcNAc Transferase'' by David Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2011_9 10.2210/rcsb_pdb/mom_2011_9]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1W3B OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1W3B 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]] 2.85&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></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=1w3b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1w3b OCA], [https://pdbe.org/1w3b PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1w3b RCSB], [https://www.ebi.ac.uk/pdbsum/1w3b PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1w3b ProSAT]</span></td></tr>
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</table>
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== Disease ==
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[https://www.uniprot.org/uniprot/OGT1_HUMAN OGT1_HUMAN] Regulation of OGT activity and altered O-GlcNAcylations are implicated in diabetes and Alzheimer disease. O-GlcNAcylation of AKT1 affects insulin signaling and, possibly diabetes. Reduced O-GlcNAcylations and resulting increased phosphorylations of MAPT/TAU are observed in Alzheimer disease (AD) brain cerebrum.
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== Function ==
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[https://www.uniprot.org/uniprot/OGT1_HUMAN OGT1_HUMAN] Catalyzes the transfer of a single N-acetylglucosamine from UDP-GlcNAc to a serine or threonine residue in cytoplasmic and nuclear proteins resulting in their modification with a beta-linked N-acetylglucosamine (O-GlcNAc). Glycosylates a large and diverse number of proteins including histone H2B, AKT1, PFKL, KMT2E/MLL5, MAPT/TAU and HCFC1. Can regulate their cellular processes via cross-talk between glycosylation and phosphorylation or by affecting proteolytic processing. Involved in insulin resistance in muscle and adipocyte cells via glycosylating insulin signaling components and inhibiting the 'Thr-308' phosphorylation of AKT1, enhancing IRS1 phosphorylation and attenuating insulin signaling. Involved in glycolysis regulation by mediating glycosylation of 6-phosphofructokinase PFKL, inhibiting its activity. Component of a THAP1/THAP3-HCFC1-OGT complex that is required for the regulation of the transcriptional activity of RRM1. Plays a key role in chromatin structure by mediating O-GlcNAcylation of 'Ser-112' of histone H2B: recruited to CpG-rich transcription start sites of active genes via its interaction with TET proteins (TET1, TET2 or TET3). As part of the NSL complex indirectly involved in acetylation of nucleosomal histone H4 on several lysine residues.<ref>PMID:12150998</ref> <ref>PMID:18288188</ref> <ref>PMID:19451179</ref> <ref>PMID:19377461</ref> <ref>PMID:20018852</ref> <ref>PMID:20018868</ref> <ref>PMID:20200153</ref> <ref>PMID:20824293</ref> <ref>PMID:21285374</ref> <ref>PMID:22121020</ref> <ref>PMID:22923583</ref> <ref>PMID:23353889</ref> <ref>PMID:23222540</ref> <ref>PMID:15361863</ref> <ref>PMID:21240259</ref> Isoform 2: the mitochondrial isoform (mOGT) is cytotoxic and triggers apoptosis in several cell types including INS1, an insulinoma cell line.<ref>PMID:12150998</ref> <ref>PMID:18288188</ref> <ref>PMID:19451179</ref> <ref>PMID:19377461</ref> <ref>PMID:20018852</ref> <ref>PMID:20018868</ref> <ref>PMID:20200153</ref> <ref>PMID:20824293</ref> <ref>PMID:21285374</ref> <ref>PMID:22121020</ref> <ref>PMID:22923583</ref> <ref>PMID:23353889</ref> <ref>PMID:23222540</ref> <ref>PMID:15361863</ref> <ref>PMID:21240259</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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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/w3/1w3b_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=1w3b 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 ==
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Addition of N-acetylglucosamine (GlcNAc) is a ubiquitous form of intracellular glycosylation catalyzed by the conserved O-linked GlcNAc transferase (OGT). OGT contains an N-terminal domain of tetratricopeptide (TPR) repeats that mediates the recognition of a broad range of target proteins. Components of the nuclear pore complex are major OGT targets, as OGT depletion by RNA interference (RNAi) results in the loss of GlcNAc modification at the nuclear envelope. To gain insight into the mechanism of target recognition, we solved the crystal structure of the homodimeric TPR domain of human OGT, which contains 11.5 TPR repeats. The repeats form an elongated superhelix. The concave surface of the superhelix is lined by absolutely conserved asparagines, in a manner reminiscent of the peptide-binding site of importin alpha. Based on this structural similarity, we propose that OGT uses an analogous molecular mechanism to recognize its targets.
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===THE SUPERHELICAL TPR DOMAIN OF O-LINKED GLCNAC TRANSFERASE REVEALS STRUCTURAL SIMILARITIES TO IMPORTIN ALPHA.===
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The superhelical TPR-repeat domain of O-linked GlcNAc transferase exhibits structural similarities to importin alpha.,Jinek M, Rehwinkel J, Lazarus BD, Izaurralde E, Hanover JA, Conti E Nat Struct Mol Biol. 2004 Oct;11(10):1001-7. Epub 2004 Sep 12. PMID:15361863<ref>PMID:15361863</ref>
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{{ABSTRACT_PUBMED_15361863}}
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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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==About this Structure==
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<div class="pdbe-citations 1w3b" style="background-color:#fffaf0;"></div>
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[[1w3b]] is a 2 chain structure of [[O-GlcNAc transferase]] with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The September 2011 RCSB PDB [http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''O-GlcNAc Transferase'' by David Goodsell is [http://dx.doi.org/10.2210/rcsb_pdb/mom_2011_9 10.2210/rcsb_pdb/mom_2011_9]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1W3B OCA].
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==See Also==
==See Also==
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*[[O-GlcNAc transferase|O-GlcNAc transferase]]
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*[[O-GlcNAc transferase 3D structures|O-GlcNAc transferase 3D structures]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:015361863</ref><references group="xtra"/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Large Structures]]
[[Category: O-GlcNAc Transferase]]
[[Category: O-GlcNAc Transferase]]
[[Category: RCSB PDB Molecule of the Month]]
[[Category: RCSB PDB Molecule of the Month]]
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[[Category: Conti, E.]]
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[[Category: Conti E]]
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[[Category: Hanover, J A.]]
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[[Category: Hanover JA]]
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[[Category: Izaurralde, E.]]
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[[Category: Izaurralde E]]
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[[Category: Jinek, M.]]
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[[Category: Jinek M]]
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[[Category: Lazarus, B D.]]
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[[Category: Lazarus BD]]
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[[Category: Rehwinkel, J.]]
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[[Category: Rehwinkel J]]
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[[Category: Glcnac]]
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[[Category: Nucleoporin]]
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[[Category: O-linked glycosylation]]
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[[Category: Ogt]]
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[[Category: Protein binding]]
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[[Category: Signal transduction]]
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[[Category: Tpr repeat]]
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[[Category: Transferase]]
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Current revision

The superhelical TPR domain of O-linked GlcNAc transferase reveals structural similarities to importin alpha.

PDB ID 1w3b

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