• Pentabromopseudilin (PBrP) is an antibiotic compound derived from marine bacteria Pseudomonas bromoutilis and Alteromonas luteoviolaceus. It shows antimicrobial, antitumor, and phytotoxic effects, and functions as a reversible allosteric inhibitor of myosin Va. PBrP also strongly inhibits TGF-β signaling, making it a candidate for research in fibrotic diseases and cancer therapies.