This family contains the enzyme 6-carboxyhexanoate--CoA ligase EC:6.2.1.14. This enzyme is involved in the first step of biotin synthesis, where it converts pimelate into pimeloyl-CoA [1]. The enzyme requires magnesium as a cofactor and forms a homodimer [1].

1: Investigation of the first step of biotin biosynthesis in Bacillus sphaericus. Purification and characterization of the pimeloyl-CoA synthase, and uptake of pimelate. Ploux O, Soularue P, Marquet A, Gloeckler R, Lemoine Y; Biochem J 1992;287:685-690. PMID:1445232