l-amino-acid ligases (LALs; EC 6.3.2.28) were discovered to be ATP-grasp superfamily enzymes that catalyze the formation of an alpha-peptide bond between two l-amino acids in an ATP-dependent manner. The members of this family share a common structural architecture that consists of three domains referred to as the A-domain, B-domain and C-domain. The C domain can be further divided into the C1-subdomain and the C2-subdomain [1]. This entry represents the C2 subdomain.

1: The structure of L-amino-acid ligase from Bacillus licheniformis. Suzuki M, Takahashi Y, Noguchi A, Arai T, Yagasaki M, Kino K, Saito J; Acta Crystallogr D Biol Crystallogr. 2012;68:1535-1540. PMID:23090402