C201S CstB displays persulfide transferase (PT) activity with LMW persulfide substrates. (A) Initial TS generation rates as a function of concentrations of CoASSH (open circles), CoA (open squares), CoAox (open diamonds) and Na2S (crosses). The dashed, continuous line through the open circles is a fit to the Michaelis-Menten equation, with parameters summarized in Table 3. (B) Initial TS generation rates as a function of concentrations of BSSH (open circles), BSH (open squares), BSSB (open diamonds) and Na2S (crosses). The dashed, continuous line through the open circles is a fit to the Michaelis-Menten equation, with parameters summarized in Table 3.