Bacterial Sortase Substrate III, Abz/DNP is an internally quenched fluorescent peptide substrate. Staphylococcus aureus transpeptidase sortase A (SrtA) reacts with its native substrate Bacterial Sortase Substrate III, Abz/DNP, cleaving it and catalyzing the formation of an amide bond between the carboxyl group of threonine and the amino group of cell-wall crossbridges. Cleavage of this substrate can be monitored at Ex/Em=320 nm/420 nm.
CAT No: R1231
Bacterial Sortase Substrate III, Abz/DNP is a synthetic peptide substrate specifically engineered for the investigation of sortase enzyme activity in bacterial systems. Characterized by its incorporation of both the fluorogenic 2-aminobenzoyl (Abz) group and the quenching dinitrophenyl (DNP) group, this substrate enables precise monitoring of enzymatic cleavage events through fluorescence-based assays. The peptide sequence is designed to mimic physiological sortase recognition motifs, making it particularly relevant for studies focused on the transpeptidase mechanisms employed by Gram-positive bacteria for cell wall protein anchoring. Its chemical properties and sequence fidelity render it a valuable tool for dissecting the functional dynamics of sortase enzymes in vitro.
Enzyme Activity Assays: Bacterial Sortase Substrate III, Abz/DNP is widely utilized as a sensitive reporter substrate in the quantitative assessment of sortase A and related transpeptidases. Upon enzymatic cleavage at the designated recognition site, separation of the Abz fluorophore from the DNP quencher leads to a measurable increase in fluorescence, providing a robust and real-time readout of enzyme kinetics. This enables researchers to determine catalytic efficiency, substrate specificity, and optimal reaction conditions with high temporal resolution, supporting both basic enzymology and inhibitor screening efforts.
Inhibitor Screening: The substrate's fluorogenic properties are particularly advantageous for high-throughput screening of small molecule or peptide-based sortase inhibitors. By allowing rapid detection of enzymatic activity or inhibition, it streamlines the identification and characterization of potential antimicrobial agents targeting the sortase-mediated protein anchoring pathway. The clear, quantifiable fluorescence signal facilitates dose-response studies and mechanism-of-action investigations, making it a preferred choice for early-stage drug discovery programs focused on anti-infective strategies.
Mechanistic Studies: Researchers employ this substrate to probe the molecular mechanisms underlying sortase-catalyzed transpeptidation. By systematically varying substrate analogs or reaction conditions, scientists can elucidate the roles of specific amino acid residues in substrate recognition, binding, and catalysis. Detailed kinetic and mutagenesis studies using this peptide facilitate a deeper understanding of enzyme-substrate interactions, guiding rational design of both novel substrates and selective inhibitors for biochemical and structural studies.
Assay Development and Validation: The dual-label design of Abz/DNP-labeled substrates provides a versatile platform for developing new fluorescence-based assays tailored to sortase activity. These assays are applicable in a variety of experimental formats, including microplate-based kinetic measurements, stopped-flow analyses, and real-time monitoring in complex biological mixtures. The substrate's reliable performance supports assay optimization, validation, and standardization across academic and industrial laboratories, ensuring reproducibility and comparability of results in sortase research.
Protein Engineering and Synthetic Biology: In the context of protein labeling and conjugation, sortase-mediated transpeptidation has become a valuable tool in synthetic biology and protein engineering. The use of this substrate allows for the optimization of sortase-catalyzed ligation protocols, assessment of enzyme variants, and validation of engineered sortase constructs. By providing a direct and quantifiable means to monitor transpeptidase activity, it supports the development of novel bioconjugation strategies for site-specific protein modification, labeling, or immobilization, expanding the toolkit available for advanced biomolecular engineering applications.
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