Members of this protein family include BshC, which is an enzyme required for bacillithiol biosynthesis and described as a cysteine-adding enzyme [1].

1: Biosynthesis and functions of bacillithiol, a major low-molecular-weight thiol in Bacilli. Gaballa A, Newton GL, Antelmann H, Parsonage D, Upton H, Rawat M, Claiborne A, Fahey RC, Helmann JD; Proc Natl Acad Sci U S A. 2010;107:6482-6486. PMID:20308541