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==Full-length bacterial polysaccharide co-polymerase WzzE from E. coli. C4 symmetry==
<StructureSection load='8bhw' size='340' side='right'caption='[[8bhw]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8bhw]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8BHW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8BHW FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.2&#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=8bhw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8bhw OCA], [https://pdbe.org/8bhw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8bhw RCSB], [https://www.ebi.ac.uk/pdbsum/8bhw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8bhw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/WZZE_ECOLI WZZE_ECOLI] Modulates the polysaccharide chain length of enterobacterial common antigen (ECA). Required for the assembly of the phosphoglyceride-linked form of ECA (ECA(PG)) and the water-soluble cyclic form of ECA (ECA(CYC)).<ref>PMID:10515954</ref> <ref>PMID:16199561</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Lipopolysaccharides such as the enterobacterial common antigen are important components of the enterobacterial cell envelope that act as a protective barrier against the environment and are often polymerized by the inner membrane bound Wzy-dependent pathway. By employing cryo-electron microscopy we show that WzzE, the co-polymerase component of this pathway that is responsible for the length modulation of the enterobacterial common antigen, is octameric with alternating up-down conformations of its L4 loops. The alternating up-down nature of these essential loops, located at the top of the periplasmic bell, are modulated by clashing helical faces between adjacent protomers that flank the L4 loops around the octameric periplasmic bell. This alternating arrangement and a highly negatively charged binding face create a dynamic environment in which the polysaccharide chain is extended, and suggest a ratchet-type mechanism for polysaccharide elongation.

Alternating L4 loop architecture of the bacterial polysaccharide co-polymerase WzzE.,Wiseman B, Widmalm G, Hogbom M Commun Biol. 2023 Aug 2;6(1):802. doi: 10.1038/s42003-023-05157-7. PMID:37532793<ref>PMID:37532793</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
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== References ==
<references/>
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</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Hogbom M]]
[[Category: Wiseman B]]