5t11

PelC L103M dodecamer from Paraburkholderia phytofirmans, space group C2

spinqualitylabelsall models 5t11, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5t11 is a 12 chain structure with sequence from Paraburkholderia phytofirmans PsJN. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.104Å Ligands: MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function B2T2U6_PARPJ Publication Abstract from PubMed Secreted polysaccharides are important functional and structural components of bacterial biofilms. The opportunistic pathogen Pseudomonas aeruginosa produces the cationic exopolysaccharide Pel, which protects bacteria from aminoglycoside antibiotics and contributes to biofilm architecture through ionic interactions with extracellular DNA. A bioinformatics analysis of genome databases suggests that gene clusters for Pel biosynthesis are present in >125 bacterial species, yet little is known about how this biofilm exopolysaccharide is synthesized and exported from the cell. In this work, we characterize PelC, an outer membrane lipoprotein essential for Pel production. Crystal structures of PelC from Geobacter metallireducens and Paraburkholderia phytofirmans coupled with structure-guided disulfide cross-linking in P. aeruginosa suggest that PelC assembles into a 12- subunit ring-shaped oligomer. In this arrangement, an aromatic belt in proximity to its lipidation site positions the highly electronegative surface of PelC toward the periplasm. PelC is structurally similar to the Escherichia coli amyloid exporter CsgG; however, unlike CsgG, PelC does not possess membrane-spanning segments required for polymer export across the outer membrane. We show that the multidomain protein PelB with a predicted C-terminal beta-barrel porin localizes to the outer membrane, and propose that PelC functions as an electronegative funnel to guide the positively charged Pel polysaccharide toward an exit channel formed by PelB. Together, our findings provide insight into the unique molecular architecture and export mechanism of the Pel apparatus, a widespread exopolysaccharide secretion system found in environmental and pathogenic bacteria. Oligomeric lipoprotein PelC guides Pel polysaccharide export across the outer membrane of Pseudomonas aeruginosa.,Marmont LS, Rich JD, Whitney JC, Whitfield GB, Almblad H, Robinson H, Parsek MR, Harrison JJ, Howell PL Proc Natl Acad Sci U S A. 2017 Feb 27. pii: 201613606. doi:, 10.1073/pnas.1613606114. PMID:28242707 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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