In bacteria, selenocysteine lyase activity (EC 4.4.1.16) usually is seen as a secondary activity of a cysteine desulfurase (EC 2.8.1.7). However, SclA, as studied in Enterococcus faecalis, acts primary on selenocysteine, binding cysteine just as well but acting on cysteine with much lower catalytic efficiency.
Jiyao W et al.(2023). "The conserved domain database in 2023.",