9 research outputs found

    B. longum 35624 EPS proton and carbon signals.

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    <p>(<b>A</b>) A selected region of the multiplicity-edited, gradient enhanced <sup>1</sup>H, <sup>13</sup>C-HSQC NMR spectrum of the exopolysaccharide. Letters denote the residues as given in the structural formula and arabic numerals denote the respective pyranose position. Resonances from anomeric carbons/protons, glycosylation sites and resolved signals are annotated. (<b>B</b>) Selected region of the <sup>1</sup>H, <sup>13</sup>C-HSQC-TOCSY NMR spectrum (600 MHz) of the acid-treated <b>35624</b> EPS. Arabic numerals before and after oblique stroke denote carbons and protons, respectively.</p

    Mild acid hydrolysis of EPS.

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    <p>(A) Separation of EPS fragments by PGC HPLC with MS/MS detection. The extracted ion chromatogram for mass 1008.39 Da shows four peaks. Their reducing end sugar was clearly revealed by ESI-MS/MS. Their assignment as either Gal or Glc and the interpretation in terms of fragment structures was done <i>a posteriori</i> based on MALDI-TOF data and on knowledge of the EPS structure. (B) Example of a MALDI-TOF/TOF fragment spectrum showing b-ions from the non-reducing and y- and y´ (= <sup>1,5</sup>x) -ions from the reducing end.</p

    B. longum 35624 EPS characterization.

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    <p>(A) The 600 MHz <sup>1</sup>H NMR proton spectrum of the acid-treated <b>35624</b> EPS (D<sub>2</sub>O, 338 K) is illustrated. A part of the high-field region is displayed in the insert. <b>(B)</b> Expansion plot of the 150 MHz 13C NMR spectrum of the acid-treated <b>35624</b> exopolysaccharide. The anomeric signals on the left confirmed the presence of a hexasaccharide repeat unit.</p

    EPS gene cluster.

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    <p>Illustration of the EPS cluster located in the <i>B</i>. <i>longum</i> <b>35624</b> genome and comparison to similar clusters located in <i>B</i>. <i>longum</i> 105-A, <i>B</i>. <i>longum</i> subsp. <i>longum</i> JCM1217 and <i>B</i>. <i>longum</i> subsp. <i>longum</i> NCC2705. Each gene is colour-coded according to function which is indicated in the legend located at the end of the page. Percentages represent the percent of sequence similarity at the protein level with corresponding genes in the <i>B</i>. <i>longum</i> <b>35624</b> genome. The locus tags of the first and last genes located in the EPS clusters of <i>B</i>. <i>longum</i> 105-A, <i>B</i>. <i>longum</i> subsp. <i>longum</i> JCM1217 and <i>B</i>. <i>longum</i> subsp. <i>longum</i> NCC2705 are also indicated in the illustration.</p

    B. longum 35624 EPS composition and structure.

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    <p>The structure is annotated as the chemical formula and in condensed form. Capital letters denote the residues as in Figs <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0162983#pone.0162983.g006" target="_blank">6</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0162983#pone.0162983.g007" target="_blank">7</a>.</p
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