Investigation of core machinery for biosynthesis of Vi antigen capsular polysaccharides in Gram-negative bacteria.

Salmonella enterica serovar Typhi causes typhoid fever. It possesses a Vi antigen capsular polysaccharide coat that is important for virulence and is the basis of a current glycoconjugate vaccine. Vi antigen is also produced by environmental Bordetella isolates, while mammal-adapted Bordetella species (such as Bordetella bronchiseptica) produce a capsule of undetermined structure that cross-reacts with antibodies recognizing Vi antigen.

Assembly of Bacterial Capsular Polysaccharides and Exopolysaccharides.

Polysaccharides are dominant features of most bacterial surfaces and are displayed in different formats. Many bacteria produce abundant long-chain capsular polysaccharides, which can maintain a strong association and form a capsule structure enveloping the cell and/or take the form of exopolysaccharides that are mostly secreted into the immediate environment. These polymers afford the producing bacteria protection from a wide range of physical, chemical, and biological stresses, support biofilms, and play critical roles in interactions between bacteria and their immediate environments.

Analysis of the Topology and Active-Site Residues of WbbF, a Putative O-Polysaccharide Synthase from Salmonella enterica Serovar Borreze.

Bacterial lipopolysaccharides are major components and contributors to the integrity of Gram-negative outer membranes. The more conserved lipid A-core part of this complex glycolipid is synthesized separately from the hypervariable O-antigenic polysaccharide (OPS) part, and they are joined in the periplasm prior to translocation to the outer membrane. Three different biosynthesis strategies are recognized for OPS biosynthesis, and one, the synthase-dependent pathway, is currently confined to a single example: the O:54 antigen from serovar Borreze.

Battling a Common Enemy: Joining Forces in the Fight against Sewage Pollution.

The health of both coral reefs and people are imperiled by a local threat that is widespread across the globe-sewage and the typical components it carries (e.g., nutrients, sediments, heavy metals, endocrine disruptors, pathogens, and pharmaceuticals).

Medical professionalism: what the study of literature can contribute to the conversation.

Medical school curricula, although traditionally and historically dominated by science, have generally accepted, appreciated, and welcomed the inclusion of literature over the past several decades. Recent concerns about medical professional formation have led to discussions about the specific role and contribution of literature and stories. In this article, we demonstrate how professionalism and the study of literature can be brought into relationship through critical and interrogative interactions based in the literary skill of close reading.