Sulfisomidine

Sulfisomidine (CAS No.: 515-64-0) is a short-acting sulfonamide antibacterial compound widely used as a biochemical tool in studies of microbial metabolism and enzyme inhibition. It exerts its primary activity by competitively interfering with para-aminobenzoic acid (PABA) utilization in the bacterial tetrahydrofolate synthesis pathway, thereby disrupting folate-dependent metabolic processes essential for bacterial growth. In addition to its antimicrobial mechanism, sulfisomidine has been identified as an inhibitor of human serum paraoxonase 1 (hPON1), exhibiting mixed-type inhibition with activity in the millimolar range, making it relevant for investigations into enzyme kinetics, oxidative stress regulation, and lipid metabolism pathways. Experimental applications often include in vitro enzyme assays and cell-based models to evaluate hPON1 modulation or antibacterial activity, with concentrations typically selected around reported inhibitory ranges depending on assay design. Furthermore, sulfisomidine has been utilized in environmental and degradation studies, such as advanced oxidation processes, to examine transformation pathways and ecological fate of sulfonamide compounds. Overall, this molecule serves as a versatile research reagent in microbiology, enzymology, and environmental science for probing folate biosynthesis inhibition and paraoxonase-related biochemical functions.