This disclosure provides isolated or recombinant polypeptides that are useful to vaccinate individuals suffering from chronic/recurrent biofilm disease or as a therapeutic for those with an existing infection. The individual's immune system will then naturally generate antibodies which prevent or clear these bacteria from the host by interfering with the construction and or maintenance of a functional protective biofilm. Alternatively, antibodies to the polypeptides can be administered to treat or prevent infection. Bacteria that are released from the biofilm by our technology are more readily cleared by the remainder of the host's immune system.

Antigen binding proteins that interact with class 5 ETEC adhesins, compositions comprising said antigen binding proteins, and methods of preventing or treating ETEC related disorders in a subject in need thereof comprising administering to said subject a therapeutically effective amount of one or more of said compositions are described.

In one aspect, the invention relates to an immunogenic composition comprising modified O-polysaccharide molecules derived from E. coli lipopolysaccharides and conjugates thereof. Multivalent vaccines may be prepared by combining two or more monovalent immunogenic compositions for different E. coli serotypes. In one embodiment, the modified O-polysaccharide molecules are produced by a recombinant bacterium that includes a wzz gene.

The invention is based on the discovery of the epitope in the Stx2 protein for the 11 E1O antibody. The invention features compositions containing non-full length Stx2 polypeptides that include the 11 E1O monoclonal antibody epitope. The invention also features methods of producing anti-Stx2 antibodies specific for the 11 E1O epitope of the Stx2 protein. Additionally, the invention features methods for treating a subject having, or at risk of developing, a Shiga toxin associated disease (e.g., hemolytic uremia syndrome and diseases associated with E. coli and S. dysenteriae infection) with a polypeptide that includes the 11 E1O epitope or with an anti-Stx2 antibody developed using the methods of the invention. Furthermore, the invention features the detection of Stx2 in a sample using the antibodies developed using the methods of the invention.

Disclosed is a method for purification of monoclonal antibodies or of a fusion protein between the Fc segment of an antibody and a second polypeptide, including a) an affinity chromatography step on a resin having as a matrix a crosslinked methacrylate polymer gel, on which the protein A is grafted, b) a viral inactivation step, c) a chromatography step exchanging cations on a resin having a crosslinked agarose gel matrix, on which sulfonate groups (—SO.sub.3—) are grafted using dextran-based spacer arms, d) a chromatography step exchanging anions on a hydrophilic membrane of polyethersulfone coated with a crosslinked polymer on which quaternary amine groups (Q) are grafted, and e) a nanofiltration step using a filter having an asymmetric polyethersulfone double membrane with a porosity of approximately 20 nm.

In general, the invention features a novel CBM32-derived affinity scaffold. In certain embodiments, the scaffold comprises two types of regions: constant regions (CRs) and variable loop regions (VLRs) as depicted in the structure in FIG. 1. We have discovered that the CRs provide structural features that enable overall conformational stability while the intervening sequences corresponding to VLRs tolerate amino acid sequence randomization.

Antibody molecule-drug conjugates (ADCs) that specifically bind to lipopolysaccharides (LPS) are disclosed. The antibody molecule-drug conjugates can be used to treat, prevent, and/or diagnose bacterial infections and related disorders.

The inventive subject matter relates to a construct comprising antigens derived from multiple enterobacteria including Campylobacter jejuni capsule polysaccharide polymer, enterotoxigenic Escherichia coli recombinant polypeptide construct and lipopolysaccharide from Shigella spp. The subject invention also relates to a method of inducing an immune response utilizing the inventive composition.

The present invention discloses a hypericin albumin nanoparticle-Escherichia coli serum antibody complex, which is obtained through adding mixed hypericin albumin nanoparticles and rabbit anti-Escherichia colis into ethanediol, irradiating them with carbon ion, setting them at a low temperature for 2 hours after irradiation, centrifuging them at a low temperature, and freezing and drying the precipitates. Its preparation method and application are also provided. The beneficial effects of the present invention are as follows: the present invention provides a hypericin albumin nanoparticle-Escherichia coli serum antibody complex and its preparation method and application, wherein through bacteriostatic test and clinical pharmacodynamic test, it is proved that the effects of target complex is greatly improved compared with that of the prior drug, because the Escherichia coli serum antibodies seek and capture Escherichia coli and the hypericin albumin nanoparticles inhibit and kill Escherichia coli, which precisely attacks Escherichia coli and strengthen the antibacterial effect of hypericin albumin nanoparticle on chicken focus location.

The present invention relates to the use of a composition selected from the group consisting of antibodies, antibody fragments, insulin-like growth factor antagonists, Toll-like receptor antagonists and mixtures thereof for the treatment or the prophylaxis of certain diseases.