The present invention relates to, inter alia, safe and effective doses of a beta-lactamase for, e.g. microbiome protection.

The present disclosure relates to compositions of immobilized enzymes on the surface of achromosomal and/or anucleate cells and uses thereof. In particular, the present disclosure provides genetically engineered minicells with enzymes self-assembled on their surface. The immobilized enzymes on the surface of achromosomal and/or anucleate minicells, has agricultural, industrial, and environmental applications due to their improved stability durability and, reusability. Also, provided are methods for producing and purifying enzyme-immobilized minicells.

The present invention provides, in part, formulations comprising a beta-lactamase. Particularly, modified-release powder formulations comprising a beta-lactamase are provided which release a substantial amount of the beta-lactamase in the intestines. Therapeutic uses of the beta-lactamase formulations are also provided.

Provided herein are compositions and methods comprising engineered microorganisms and their use for locally degrading an antibiotic in the gastrointestinal tract to prevent or limit death of beneficial flora.

Recombinant bacterial cells are provided that comprise a stable non-canonical amino acid translation pathway. In some aspects, the bacteria comprise nucleic acids encoding a non-canonical amino acid translation pathway (e.g., a tRNA for incorporation of a non-canonical amino acid, such selenocysteine); a marker polypeptide that includes the non-canonical amino acid. Recombinant tRNA and selection marker coding sequences are likewise provided.

The present disclosure features portable wide field fluorimeter systems, e.g., in the form of low-cost mobile platforms, and methods to perform fluorometric assays to detect a change in fluorescence intensity in liquid samples, e.g., caused by the presence of a target analyte, e.g., a protein, e.g., an enzyme (e.g., -lactamase) expressed by a target pathogen in a liquid sample in a point-of-care setting. In some implementations, a portable system for detecting a change in fluorescence intensity in a liquid sample includes a microfluidic device, an optical assembly including an emission filter and one or more lenses, and an analyzer device that collects and processes a fluorescent signal for the detection of a target analyte produced by the target pathogen present in the liquid sample.

This invention relates to, in part, compositions of beta-lactamases and methods of using these enzymes in, for example, gastrointestinal tract (GI tract) disorders such as C. difficile infection (CDI).

This invention provides, in part, various compositions and methods for protecting the gastrointestinal microbiome from antibiotic disruption from orally administered antibiotics.

The present invention relates to, inter alia, safe and effective doses of a beta-lactamase for, e.g. microbiome protection.

This invention provides, in part, various compositions and methods for protecting the gastrointestinal microbiome from antibiotic disruption.