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==Capsule O-acetyltransferase of Neisseria meningitidis serogroup A==
<StructureSection load='6yuv' size='340' side='right'caption='[[6yuv]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6yuv]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Neimd Neimd]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6YUV OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6YUV FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">sacC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=65699 NEIMD])</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=6yuv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6yuv OCA], [http://pdbe.org/6yuv PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6yuv RCSB], [http://www.ebi.ac.uk/pdbsum/6yuv PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6yuv ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
O-Acetylation of the capsular polysaccharide (CPS) of Neisseria meningitidis serogroup A (NmA) is critical for the induction of functional immune responses, making this modification mandatory for CPS-based anti-NmA vaccines. Using comprehensive NMR studies, we demonstrate that O-acetylation stabilizes the labile anomeric phosphodiester-linkages of the NmA-CPS and occurs in position C3 and C4 of the N-acetylmannosamine units due to enzymatic transfer and non-enzymatic ester migration, respectively. To shed light on the enzymatic transfer mechanism, we solved the crystal structure of the capsule O-acetyltransferase CsaC in its apo and acceptor-bound form and of the CsaC-H228A mutant as trapped acetyl-enzyme adduct in complex with CoA. Together with the results of a comprehensive mutagenesis study, the reported structures explain the strict regioselectivity of CsaC and provide insight into the catalytic mechanism, which relies on an unexpected Gln-extension of a classical Ser-His-Asp triad, embedded in an alpha/beta-hydrolase fold.

Structural and mechanistic basis of capsule O-acetylation in Neisseria meningitidis serogroup A.,Fiebig T, Cramer JT, Bethe A, Baruch P, Curth U, Fuhring JI, Buettner FFR, Vogel U, Schubert M, Fedorov R, Muhlenhoff M Nat Commun. 2020 Sep 18;11(1):4723. doi: 10.1038/s41467-020-18464-y. PMID:32948778<ref>PMID:32948778</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6yuv" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Neimd]]
[[Category: Cramer, J T]]
[[Category: Fedorov, R]]
[[Category: Fiebig, T]]
[[Category: Muehlenhoff, M]]
[[Category: A/b hydrolase fold]]
[[Category: Catalytic triad]]
[[Category: O-acetyltransferase]]
[[Category: Serine transferase]]
[[Category: Transferase]]