9ski

Polysaccharide co-polymerase FepE open 7 subunit complex

spinqualitylabelsall models 9ski, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9ski is a 7 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.1Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FEPE_ECOLI Part of the ferric enterobactin transport system. Publication Abstract from PubMed Lipopolysaccharides are important components of the gram-negative bacterial cell envelope that are involved in immune evasion and act as a protective barrier. Employing cryo-electron microscopy, we resolved the structure and dynamics of FepE, the copolymerase component of the Wzy-dependent pathway, responsible for the length modulation of very long O-antigen molecules. Comparison of the interior volumes of related copolymerases' periplasmic domains with the volume of hydrated sugars suggests that the size of the periplasmic domain controls the length of the O-antigen, implying that polysaccharide chain polymerization occurs inside the copolymerase periplasmic domain. Moreover, we show the opening of the FepE complex as well as other large mechanistically relevant movements. The opening of the complex presents an attractive corridor for the release of completed polysaccharide chains. Structural Basis of Lipopolysaccharide O-Antigen Chain Length Modality.,Wiseman B, Widmalm G, Hogbom M Research (Wash D C). 2026 May 12;9:1276. doi: 10.34133/research.1276. eCollection , 2026. PMID:42131584 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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