6xcr
From Proteopedia
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==NMR structure of Ost4 in DPC micelles== | ==NMR structure of Ost4 in DPC micelles== | ||
| - | <StructureSection load='6xcr' size='340' side='right'caption='[[6xcr]]' scene=''> | + | <StructureSection load='6xcr' size='340' side='right'caption='[[6xcr]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>Full | + | <table><tr><td colspan='2'>[[6xcr]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Baker's_yeast Baker's yeast]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6XCR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6XCR FirstGlance]. <br> |
| - | </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=6xcr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6xcr OCA], [https://pdbe.org/6xcr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6xcr RCSB], [https://www.ebi.ac.uk/pdbsum/6xcr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6xcr ProSAT]</span></td></tr> | + | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">OST4, SCY_0690 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=307796 Baker's yeast])</td></tr> |
| + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Dolichyl-diphosphooligosaccharide--protein_glycotransferase Dolichyl-diphosphooligosaccharide--protein glycotransferase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.99.18 2.4.99.18] </span></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=6xcr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6xcr OCA], [https://pdbe.org/6xcr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6xcr RCSB], [https://www.ebi.ac.uk/pdbsum/6xcr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6xcr ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Asparagine-linked glycosylation, also known as N-linked glycosylation, is an essential and highly conserved co- and post-translational protein modification in eukaryotes and some prokaryotes. In the central step of this reaction, a carbohydrate moiety is transferred from a lipid-linked donor to the side-chain of a consensus asparagine in a nascent protein as it is synthesized at the ribosome. Complete loss of oligosaccharyltransferase (OST) function is lethal in eukaryotes. This reaction is carried out by a membrane-associated multi-subunit enzyme, OST, localized in the endoplasmic reticulum (ER). The smallest subunit, Ost4, contains a single membrane-spanning helix that is critical for maintaining stability and activity of OST. Mutation of any residue from Met18 to Ile24 of Ost4 destabilizes the enzyme complex, affecting its activity. Here, we report solution NMR structures and molecular dynamics simulations of Ost4 and Ost4V23D in micelles. Our studies revealed that while the point mutation did not impact the structure of the protein, it affected its position and solvent exposure in the membrane mimetic environment. Furthermore, our molecular dynamics simulations of the membrane-bound OST complex containing either WT or V23D mutant demonstrated disruption of most hydrophobic helix-helix interactions between Ost4V23D and transmembrane (TM)12 and TM13 of Stt3. This disengagement of Ost4V23D from the OST complex led to solvent exposure of the D23 residue in the hydrophobic pocket created by these interactions. Our study not only solves the structures of yeast Ost4 subunit and its mutant but also provides a basis for the destabilization of the OST complex and reduced OST activity. | ||
| + | |||
| + | NMR and MD Simulations Reveal the Impact of the V23D Mutation on the Function of Yeast Oligosaccharyltransferase Subunit Ost4.,Chaudhary BP, Zoetewey DL, McCullagh MJ, Mohanty S Glycobiology. 2021 Jan 12. pii: 6090023. doi: 10.1093/glycob/cwab002. PMID:33442744<ref>PMID:33442744</ref> | ||
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| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 6xcr" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| + | [[Category: Baker's yeast]] | ||
| + | [[Category: Dolichyl-diphosphooligosaccharide--protein glycotransferase]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
| - | [[Category: Chaudhary | + | [[Category: Chaudhary, B P]] |
| + | [[Category: Membrane protein]] | ||
| + | [[Category: Transferase]] | ||
Revision as of 08:55, 29 September 2021
NMR structure of Ost4 in DPC micelles
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