Figure 3

Labelling the FCM motif with FlAsH and the ybbR motif with CoA-AF647. (a) Labelling scheme and mechanism of attaching FlAsH-EDT₂ to the FCM motif in the presence of the reducing agent TCEP. (b) Labelling scheme and mechanism for attaching CoA-AF647 to the ybbR motif in the presence of MgCl₂ and the enzyme Sfp synthase.