Life Sciences Research for Lifelong Health


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Title / Authors / Details Open Access Download

Structure of an acidic glycan present in the lipopolysaccharide extract from the reference strain for Serratia marcescens serogroup O18.
Oxley D,Wilkinson SG

The lipopolysaccharide extract from the cell wall of the reference strain for Serratia marcescens serogroup O18 contained, in addition to a neutral glycan characterised previously, an acidic glycan. Acidity was contributed both by D-glucuronic acid and by 4-O-[(R)-1-carboxyethyl]-D-glucose (4-O-Lac-D-Glc). By using n.m.r. spectroscopy, methylation analysis, and chemical degradations, the repeating unit of the acidic glycan was identified as a branched hexasaccharide having the structure shown; an O-acetyl group also present was not located. The glycan is believed to define the O18 serogroup, but is probably not an integral component of the lipopolysaccharide. [formula: see text].

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Carbohydrate research, 215, 0008-6215, 293-301, 1991

PMID: 1794127

Monoclonal antibodies to idiotype inhibit in vitro growth of human B-cell lymphomas.
van Endert PM, Heilig B, Hämmerling GJ, Moldenhauer G

The effect of monoclonal antibodies (MoAbs) recognizing idiotype, IgM heavy chain, and IgD heavy chain on the in vitro DNA synthesis of five randomly selected leukemic human low-malignancy B-cell lymphomas was investigated. In three lymphomas of different histologic subtype, low concentrations of anti-idiotypic (anti-Id) MoAb completely inhibited spontaneous 3H-thymidine uptake of T-cell-- and monocyte-depleted tumor cells, whereas two other tumors were not affected. Maximal inhibition of DNA synthesis was achieved at MoAb concentrations ranging from 0.5 to 250 micrograms/mL and required crosslinking by bivalent antibody but not Fc-mediated effects. While two anti-IgM MoAbs were similarly efficient as anti-Id MoAb in inhibition of DNA synthesis, two anti-IgD MoAbs had no effect. Thus, surface IgD molecules seemed to be neither able to deliver inhibitory signals themselves nor to antagonize IgM-mediated signals when simultaneously crosslinked by anti-Id MoAb. Leukocyte differentiation antigen expression, IgM density, and IgM/IgD ratio on the surface of lymphoma cells did not distinguish between sensitive and resistant tumors. In vitro tumor cell survival was differently affected by prolonged incubation with anti-Id antibody. In a centrocytic lymphoma and an immunocytoma, but not in a chronic lymphocytic leukemia, suppression of 3H-thymidine uptake persisted after removal of MoAb and tumor cell viability decreased during prolonged incubation with anti-Id MoAb. These results suggest that direct inhibitory signaling via surface IgM may contribute to anti-Id MoAb-mediated tumor regression in certain human B-cell lymphomas.

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Blood, 79, 0006-4971, 129-37, 1992

PMID: 1728304

Open Access

Structure of the 021 antigen from Serratia marcescens.
Oxley D,Wilkinson SG

Lipopolysaccharide was isolated from both phases of an aqueous-phenol extraction of defatted cell walls from the reference strain for Serratia marcescens serogroup 021. The product from the aqueous phase was of the R type, lacking a polymeric side-chain. The polymeric fraction of the lipopolysaccharide from the phenolic phase (the 021 antigen) had a disaccharide repeating-unit with the following structure: ----4)-alpha-D-Glcp-(1----4)-beta-D-ManpNAc-(1----.

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Carbohydrate research, 212, 0008-6215, 187-92, 1991

PMID: 1720344

Structure of a glucorhamnan from the lipopolysaccharide of Serratia marcescens strain S1254.
Oxley D,Wilkinson SG

Carbohydrate research, 209, 0008-6215, 319-22, 1991

PMID: 1709820

Structure of the putative O23 antigen of Serratia marcescens.
Oxley D,Wilkinson SG

A neutral glycan containing L-rhamnose and 2-acetamido-2-deoxy-D-galactose is one of two polymers present in the lipopolysaccharide extract from the reference strain for Serratia marcescens serogroup O23. The glycan, which has the disaccharide repeating-unit shown, shares structural features with polymers from several other O serogroups. ----4)-alpha-L-Rhap-(1----4)-beta-D-GalpNAc-(1----.

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Carbohydrate research, 196, 0008-6215, 127-31, 1990

PMID: 1693310

Structure of an acidic glycan from the reference strain for Serratia marcescens serogroup O22.
Oxley D,Wilkinson SG

In addition to a neutral glycan, lipopolysaccharide extracts from the reference strain for Serratia marcescens serogroup O22 contain an acidic polymer which probably defines the serogroup and is of microcapsular origin. The polymer is doubly branched with a heptasaccharide repeating unit and a galactan backbone. By means of spectroscopic and degradative studies, the structure of the repeating unit was established as that shown. [formula: see text]

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Carbohydrate research, 231, 0008-6215, 237-48, 1992

PMID: 1394317

Structure of a neutral glycan from the lipopolysaccharides of reference strains for Serratia marcescens serogroups O2 and O3.
Oxley D,Wilkinson SG

Serogroups O2 and O3 of Serratia marcescens are differentiated by acidic glycans present in the aqueous phase when lipopolysaccharides are extracted from the reference strains by the aqueous-phenol method. The phenolic phases of these extracts from both strains also contain lipopolysaccharides, from which the same neutral glycan is released on milk acid hydrolysis. The neutral glycan has the disaccharide repeating-unit shown, and accounts for the cross-reactions between the two serogroups and also with serogroup O21: --> 4)-alpha-D-GlcpNAc-(1-->4)-beta-D-ManpNAc-(1--.

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FEMS microbiology letters, 78, 0378-1097, 209-12, 1992

PMID: 1283379

First cell fate decisions in early development – towards establishment of the trophoblast lineage
M Hemberger and W Dean

The Guide of Investigations of Mouse Pregnancy, , , , 2013

Simulating the Bacterial Chemotaxis Pathway at High Spatio-temporal Detail
Sewitz S and Lipkow K

We have used the Smoldyn software to create spatially detailed models of the Escherichia coli chemotaxis pathway. With it we can follow signalling reactions at high spatio-temporal resolution, observe the formation of gradients of phospho-proteins as well as total protein and analyse the effects of macromolecular crowding on signalling. It has enabled us to propose new regulatory elements of the signalling pathway, which are mediated through the dynamic localisation and activity of the CheZ phosphatase. We used the Smoldyn software to model quantitative fluorescent microscopy data and to determine diffusion coefficients and binding affinities. We can reliably gain information obtained under conditions with high levels of experimental noise. Smoldyn can accommodate various cellular architectures, and we show that cell shape becomes an integral part of the signalling process.

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Current Chemical Biology, 7, 3, 214 - 223, 2013