3otk: Difference between revisions

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[[Image:3otk.jpg|left|200px]]


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==Structure and mechanisim of core 2 beta1,6-n-acetylglucosaminyltransferase: a Metal-ion independent gt-a glycosyltransferase==
The line below this paragraph, containing "STRUCTURE_3otk", creates the "Structure Box" on the page.
<StructureSection load='3otk' size='340' side='right'caption='[[3otk]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[3otk]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3OTK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3OTK FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.3&#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=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=HTO:HEPTANE-1,2,3-TRIOL'>HTO</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=UDP:URIDINE-5-DIPHOSPHATE'>UDP</scene></td></tr>
{{STRUCTURE_3otk|  PDB=3otk  |  SCENE=  }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3otk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3otk OCA], [https://pdbe.org/3otk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3otk RCSB], [https://www.ebi.ac.uk/pdbsum/3otk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3otk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GCNT1_MOUSE GCNT1_MOUSE] Forms critical branches in O-glycans.<ref>PMID:7983056</ref>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Leukocyte-type core 2 beta1,6-N-acetylglucosaminyltransferase (C2GnT-L) is an inverting, metal-ion-independent glycosyltransferase that catalyzes the formation of mucin-type core 2 O-glycans. C2GnT-L belongs to the GT-A fold, yet it lacks the metal ion binding DXD motif characteristic of other nucleoside disphosphate GT-A fold glycosyltransferases. To shed light on the basis for its metal ion independence, we have solved the X-ray crystal structure (2.3 A resolution) of a mutant form of C2GnT-L (C217S) in complex with the nucleotide sugar product UDP and, using site-directed mutagenesis, examined the roles of R378 and K401 in both substrate binding and catalysis. The structure shows that C2GnT-L exists in an "open" conformation and a "closed" conformation and that, in the latter, R378 and K401 interact with the beta-phosphate moiety of the bound UDP. The two conformations are likely to be important in catalysis, but the conformational changes that lead to their interconversion do not resemble the nucleotide-sugar-mediated loop ordering observed in other GT-A glycosyltransferases. R378 and K401 were found to be important in substrate binding and/or catalysis, an observation consistent with the suggestion that they serve the same role played by metal ion in all of the other GT-A glycosyltransferases studied to date. Notably, R378 and K401 appear to function in a manner similar to that of the arginine and lysine residues contained in the RX(4-5)K motif found in the retaining GT-B glycosyltransferases.


===Structure and mechanisim of core 2 beta1,6-n-acetylglucosaminyltransferase: a Metal-ion independent gt-a glycosyltransferase===
Structural and mechanistic characterization of leukocyte-type core 2 beta1,6-N-acetylglucosaminyltransferase: a metal-ion-independent GT-A glycosyltransferase.,Pak JE, Satkunarajah M, Seetharaman J, Rini JM J Mol Biol. 2011 Dec 16;414(5):798-811. Epub 2011 Oct 26. PMID:22056345<ref>PMID:22056345</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3otk" style="background-color:#fffaf0;"></div>


==About this Structure==
==See Also==
[[3otk]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3OTK OCA].
*[[Glycosyltransferase 3D structures|Glycosyltransferase 3D structures]]
[[Category: Beta-1,3-galactosyl-O-glycosyl-glycoprotein beta-1,6-N- acetylglucosaminyltransferase]]
*[[O-GlcNAc transferase 3D structures|O-GlcNAc transferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Mus musculus]]
[[Category: Pak, J E.]]
[[Category: Pak JE]]
[[Category: Rini, J M.]]
[[Category: Rini JM]]
[[Category: Glycosyltransferase]]
[[Category: Golgi]]
[[Category: Transferase]]
Retrieved from "https://proteopedia.org/3otk"