View source for 5vvv


==Structural Investigations of the Substrate Specificity of Human O-GlcNAcase==
<StructureSection load='5vvv' size='340' side='right'caption='[[5vvv]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5vvv]] is a 4 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=5VVV OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5VVV FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5vvo|5vvo]], [[5vvt|5vvt]], [[5vvu|5vvu]], [[5vvx|5vvx]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MGEA5, HEXC, KIAA0679, MEA5 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5vvv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5vvv OCA], [http://pdbe.org/5vvv PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5vvv RCSB], [http://www.ebi.ac.uk/pdbsum/5vvv PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5vvv ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/OGA_HUMAN OGA_HUMAN]] Isoform 1: Cleaves GlcNAc but not GalNAc from O-glycosylated proteins. Can use p-nitrophenyl-beta-GlcNAc and 4-methylumbelliferone-GlcNAc as substrates but not p-nitrophenyl-beta-GalNAc or p-nitrophenyl-alpha-GlcNAc (in vitro) (PubMed:11148210). Does not bind acetyl-CoA and does not have histone acetyltransferase activity (PubMed:24088714).<ref>PMID:11148210</ref> <ref>PMID:11788610</ref> <ref>PMID:20673219</ref> <ref>PMID:22365600</ref> <ref>PMID:24088714</ref>   Isoform 3: Cleaves GlcNAc but not GalNAc from O-glycosylated proteins. Can use p-nitrophenyl-beta-GlcNAc as substrate but not p-nitrophenyl-beta-GalNAc or p-nitrophenyl-alpha-GlcNAc (in vitro), but has about six times lower specific activity than isoform 1.<ref>PMID:20673219</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The O-linked beta-N-acetyl glucosamine (O-GlcNAc) modification dynamically regulates the functions of numerous proteins. A single human enzyme O-linked beta-N-acetyl glucosaminase (O-GlcNAcase or OGA) hydrolyzes this modification. To date, it remains largely unknown how OGA recognizes various substrates. Here we report the structures of OGA in complex with each of four distinct glycopeptide substrates that contain a single O-GlcNAc modification on a serine or threonine residue. Intriguingly, these glycopeptides bind in a bidirectional yet conserved conformation within the substrate-binding cleft of OGA. This study provides fundamental insights into a general principle that confers the substrate binding adaptability and specificity to OGA in O-GlcNAc regulation.O-linked beta-N-acetyl glucosamine (O-GlcNAc) is an important protein modification that is hydrolyzed by O-GlcNAcase (OGA). Here the authors give insights into OGA substrate recognition by presenting four human OGA structures complexed with glycopeptide substrates containing a single O-GlcNAc modification on either a serine or threonine.

Structural insights into the substrate binding adaptability and specificity of human O-GlcNAcase.,Li B, Li H, Hu CW, Jiang J Nat Commun. 2017 Sep 22;8(1):666. doi: 10.1038/s41467-017-00865-1. PMID:28939839<ref>PMID:28939839</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5vvv" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Human]]
[[Category: Large Structures]]
[[Category: Hu, C W]]
[[Category: Jiang, J]]
[[Category: Li, B]]
[[Category: Li, H]]
[[Category: A-crystalline b]]
[[Category: Human o-glcnacase]]
[[Category: Hydrolase]]
[[Category: Oga]]