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Thionins are shown to form disulphide linkages with other proteins. The reaction with bacterial enzymes β-glucuronidase and neomycin phosphotransferase II could be prevented and reversed with dithiothreitol and blocked with N-ethylmaleimide. Other cysteine-rich low-molecular-weight toxic peptides from plants (LTP-3 from barley and P19 from potato) did not react as the thionins. Certain cysteine-containing...
Thionins cause the irreversible inactivation of β-glucuronidase (GUS) in vitro in a dose- and time-dependent manner. The enzyme is also sensitive to externally added thionins when expressed in the cytoplasmic compartment of tobacco protoplasts transformed with the Gus gene under the 35S promoter of the cauliflower mosaic virus. In protoplasts transformed with the Gus gene fused to a signal peptide,...
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