View source for 6zqq


==Structure of the Pmt3-MIR domain with bound ligands==
<StructureSection load='6zqq' size='340' side='right'caption='[[6zqq]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6zqq]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6ZQQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6ZQQ 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]] 1.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></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=6zqq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6zqq OCA], [https://pdbe.org/6zqq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6zqq RCSB], [https://www.ebi.ac.uk/pdbsum/6zqq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6zqq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PMT3_YEAST PMT3_YEAST] Protein O-mannosyltransferase involved in O-glycosylation which is essential for cell wall rigidity. Forms a heterodimeric complex with PMT5 and more rarely with PMT1 to transfer mannose from Dol-P-mannose to Ser or Thr residues on proteins. Seems to have redundant activity to PMT2.<ref>PMID:9184828</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Protein O-mannosyltransferases (PMTs) represent a conserved family of multispanning endoplasmic reticulum membrane proteins involved in glycosylation of S/T-rich protein substrates and unfolded proteins. PMTs work as dimers and contain a luminal MIR domain with a beta-trefoil fold, which is susceptive for missense mutations causing alpha-dystroglycanopathies in humans. Here, we analyze PMT-MIR domains by an integrated structural biology approach using X-ray crystallography and NMR spectroscopy and evaluate their role in PMT function in vivo. We determine Pmt2- and Pmt3-MIR domain structures and identify two conserved mannose-binding sites, which are consistent with general beta-trefoil carbohydrate-binding sites (alpha, beta), and also a unique PMT2-subfamily exposed FKR motif. We show that conserved residues in site alpha influence enzyme processivity of the Pmt1-Pmt2 heterodimer in vivo. Integration of the data into the context of a Pmt1-Pmt2 structure and comparison with homologous beta-trefoil - carbohydrate complexes allows for a functional description of MIR domains in protein O-mannosylation.

Functional implications of MIR domains in protein O-mannosylation.,Chiapparino A, Grbavac A, Jonker HR, Hackmann Y, Mortensen S, Zatorska E, Schott A, Stier G, Saxena K, Wild K, Schwalbe H, Strahl S, Sinning I Elife. 2020 Dec 24;9. pii: 61189. doi: 10.7554/eLife.61189. PMID:33357379<ref>PMID:33357379</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6zqq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Chiapparino A]]
[[Category: Hackmann Y]]
[[Category: Mortensen S]]
[[Category: Sinning I]]
[[Category: Wild K]]