This domain is structurally related to the PreATP-grasp domain. The family contains the N-terminus of biotin carboxylase enzymes [1,3], and propionyl-CoA carboxylase A chain [2].

1: Three-dimensional structure of the biotin carboxylase subunit. of acetyl-CoA carboxylase. Waldrop GL, Rayment I, Holden HM; Biochemistry 1994;33:10249-10256. PMID:7915138

2: Structure and function of a single-chain, multi-domain long-chain acyl-CoA carboxylase. Tran TH, Hsiao YS, Jo J, Chou CY, Dietrich LE, Walz T, Tong L; Nature. 2015;518:120-124. PMID:25383525

3: Structural impact of human and Escherichia coli biotin carboxyl carrier proteins on biotin attachment. Healy S, McDonald MK, Wu X, Yue WW, Kochan G, Oppermann U, Gravel RA; Biochemistry. 2010;49:4687-4694. PMID:20443544