Figure 1. Genetic incorporation of alkene-lysine analogs into myoglobin by the wild-type MbPylRS/PylT_CUA pair.

(A) Structures of alkenyl lysine derivatives bearing an ε-carbamate linkage (1–6), an inverted carbamate 7, an amide 8, and an urea 9. (B) Myoglobin comparative incorporation efficiencies (%) and ESI-MS results.