Considering the emerging importance of phenotypic markers as indicators of cell function and differentiation, we studied patterns ofCD44 and CD45RB expression in CD8+ murine T cells with prior exposure to antigen or staphylococcal enterotoxin B ( SEB ). Following in vivo priming with two purified protein derivatives (one from a virulent WHO strain and the other from an avirulent strain), T ...

Bacterial delivery systems are gaining increasing interest as potential vaccination vectors to deliver either proteins or nucleic acids for gene expression in the recipient. Bacterial delivery systems for gene expression in vivo usually contain small multicopy plasmids. We have shown before that bacteria containing a herpesvirus bacterial artificial chromosome (BAC) can reconstitute the virus r...

Numerous bacterial pathogens manipulate host cell processes to promote infection and ultimately cause disease through the action of proteins that they directly inject into host cells. Identification of the targets and molecular mechanisms of action used by these bacterial effector proteins is critical to understanding pathogenesis. We have developed a systems biological approach using the yeast...

In general, four different expression systems, namely, bacterial, yeast, baculovirus, and mammalian, are widely used for the overproduction of biochemical enzymes and therapeutic proteins. Clearly, bacterial expression systems offer ease of maneuverability with respect to large-scale production of recombinant proteins, while, a baculovirus expression system ensures proper protein modifications,...

UNLABELLED Plant-pathogenic bacteria are able to integrate information about their environment and adjust gene expression to provide adaptive functions. AlgU, an extracytoplasmic function (ECF) sigma factor encoded by Pseudomonas syringae, controls expression of genes for alginate biosynthesis and genes involved with resisting osmotic and oxidative stress. AlgU is active while these bacteria ar...

Bacterial toxin-antitoxin (TA) systems, in which a labile antitoxin binds and inhibits the toxin, can promote adaptation and persistence by modulating bacterial growth in response to stress. Some atypical TA systems, known as tripartite toxin-antitoxin-chaperone (TAC) modules, include a molecular chaperone that facilitates folding and protects the antitoxin from degradation. Here we use a TAC m...

objective: bone morphogenetic protein-7 (bmp-7) is a multifunctional growth factor predominantly recognized for its osteoinductive properties. due to the high cost of this protein, the availability of bmp-7 for treatment is limited. the heterologous production of recombinant hbmp-7 has been performed in a number of expression systems. in this study a novel form of bmp-7 was expressed in eukaryo...

Central to the study of type III secretion systems is the availability of reporter systems to monitor bacterial protein translocation into host cells. We report here the development of a bacteriophage P1 Cre recombinase-based system to monitor the translocation of bacterial proteins into mammalian cells. Bacteriophage P1 Cre recombinase fused to the secretion and translocation signals of Salmon...