This is the C-terminal domain of a bacterial lipoate protein ligase. There is no conservation between this C-terminus and that of vertebrate lipoate protein ligase C-termini, but both are associated with the domain BPL_LipA_LipB Pfam:PF03099, further upstream. This domain is required for adenylation of lipoic acid by lipoate protein ligases. The domain is not required for transfer of lipoic acid from the adenylate to the lipoyl domain. Upon adenylation, this domain rotates 180 degrees away from the active site cleft. Therefore, the domain does not interact with the lipoyl domain during transfer.

1: Structure of a putative lipoate protein ligase from Thermoplasma acidophilum and the mechanism of target selection for post-translational modification. McManus E, Luisi BF, Perham RN; J Mol Biol. 2006;356:625-637. PMID:16384580

2: The Thermoplasma acidophilum LplA-LplB complex defines a new class of bipartite lipoate-protein ligases. Christensen QH, Cronan JE; J Biol Chem. 2009;284:21317-21326. PMID:19520844

3: Global conformational change associated with the two-step reaction catalyzed by Escherichia coli lipoate-protein ligase A. Fujiwara K, Maita N, Hosaka H, Okamura-Ikeda K, Nakagawa A, Taniguchi H; J Biol Chem. 2010;285:9971-9980. PMID:20089862