1zcu: Difference between revisions

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-[[Image:1zcu.gif|left|200px]]<br /><applet load="1zcu" size="450" color="white" frame="true" align="right" spinBox="true"
-caption="1zcu, resolution 2.000&Aring;" />
-'''apo form of the 162S mutant of glycogenin'''<br />
-==Overview==
+==apo form of the 162S mutant of glycogenin==
-Glycogenin is a glycosyltransferase that functions as the autocatalytic, initiator for the synthesis of glycogen in eukaryotic organisms. Prior, structural work identified the determinants responsible for the, recognition and binding of UDP-glucose and the catalytic manganese ion and, implicated two aspartic acid residues in the reaction mechanism for, self-glucosylation. We examined the effects of substituting asparagine and, serine for the aspartic acid residues at positions 159 and 162. We also, examined whether the truncation of the protein at residue 270 (delta270), was compatible with its structural integrity and its functional role as, the initiator for glycogen synthesis. The truncated form of the enzyme was, indistinguishable from the wild-type enzyme by all measures of activity, and could support glycogen accumulation in a glycogenin-deficient yeast, strain. Substitution of aspartate 159 by either serine or asparagine, eliminated self-glucosylation and reduced trans-glucosylation activity by, at least 260-fold but only reduced UDP-glucose hydrolytic activity by, 4-14-fold. Substitution of aspartate 162 by either serine or asparagine, eliminated self-glucosylation activity and reduced UDP-glucose hydrolytic, activity by at least 190-fold. The trans-glucosylation of maltose was, reduced to undetectable levels in the asparagine 162 mutant, whereas the, serine 162 enzyme showed only an 18-30-fold reduction in its ability to, trans-glucosylate maltose. These data support a role for aspartate 162 in, the chemical step for the glucosyltransferase reaction and a role for, aspartate 159 in binding and activating the acceptor molecule.
+<StructureSection load='1zcu' size='340' side='right'caption='[[1zcu]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[1zcu]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZCU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ZCU FirstGlance]. <br>
+</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&#8491;</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=1zcu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zcu OCA], [https://pdbe.org/1zcu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1zcu RCSB], [https://www.ebi.ac.uk/pdbsum/1zcu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1zcu ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/GLYG_RABIT GLYG_RABIT] Self-glucosylates, via an inter-subunit mechanism, to form an oligosaccharide primer that serves as substrate for glycogen synthase.
+== Evolutionary Conservation ==
+[[Image:Consurf_key_small.gif|200px|right]]
+Check<jmol>
+  <jmolCheckbox>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zc/1zcu_consurf.spt"</scriptWhenChecked>
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
+    <text>to colour the structure by Evolutionary Conservation</text>
+  </jmolCheckbox>
+</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=1zcu ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Glycogenin is a glycosyltransferase that functions as the autocatalytic initiator for the synthesis of glycogen in eukaryotic organisms. Prior structural work identified the determinants responsible for the recognition and binding of UDP-glucose and the catalytic manganese ion and implicated two aspartic acid residues in the reaction mechanism for self-glucosylation. We examined the effects of substituting asparagine and serine for the aspartic acid residues at positions 159 and 162. We also examined whether the truncation of the protein at residue 270 (delta270) was compatible with its structural integrity and its functional role as the initiator for glycogen synthesis. The truncated form of the enzyme was indistinguishable from the wild-type enzyme by all measures of activity and could support glycogen accumulation in a glycogenin-deficient yeast strain. Substitution of aspartate 159 by either serine or asparagine eliminated self-glucosylation and reduced trans-glucosylation activity by at least 260-fold but only reduced UDP-glucose hydrolytic activity by 4-14-fold. Substitution of aspartate 162 by either serine or asparagine eliminated self-glucosylation activity and reduced UDP-glucose hydrolytic activity by at least 190-fold. The trans-glucosylation of maltose was reduced to undetectable levels in the asparagine 162 mutant, whereas the serine 162 enzyme showed only an 18-30-fold reduction in its ability to trans-glucosylate maltose. These data support a role for aspartate 162 in the chemical step for the glucosyltransferase reaction and a role for aspartate 159 in binding and activating the acceptor molecule.
-==About this Structure==
+Requirements for catalysis in mammalian glycogenin.,Hurley TD, Stout S, Miner E, Zhou J, Roach PJ J Biol Chem. 2005 Jun 24;280(25):23892-9. Epub 2005 Apr 22. PMID:15849187<ref>PMID:15849187</ref>
-ZCU is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Active as [http://en.wikipedia.org/wiki/Glycogenin_glucosyltransferase Glycogenin glucosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.1.186 2.4.1.186] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1ZCU OCA].
-==Reference==
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-Requirements for catalysis in mammalian glycogenin., Hurley TD, Stout S, Miner E, Zhou J, Roach PJ, J Biol Chem. 2005 Jun 24;280(25):23892-9. Epub 2005 Apr 22. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15849187 15849187]
+</div>
-[[Category: Glycogenin glucosyltransferase]]
+<div class="pdbe-citations 1zcu" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Glycogenin|Glycogenin]]
+== References ==
+<references/>
+__TOC__
+</StructureSection>
+[[Category: Large Structures]]
 [[Category: Oryctolagus cuniculus]]
-[[Category: Single protein]]
+[[Category: Hurley TD]]
-[[Category: Hurley, T.D.]]
+[[Category: Miner E]]
-[[Category: Miner, E.]]
+[[Category: Roach PJ]]
-[[Category: Roach, P.J.]]
+[[Category: Stout SL]]
-[[Category: Stout, S.L.]]
+[[Category: Zhou J]]
-[[Category: Zhou, J.]]
-[[Category: transferase]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 07:23:26 2007''