This is the N-terminal all helix domain found in N-acyltransferases (NATs), the gene products orf11 and dbv8. The all-helix domain is composed of eight helices with two helix-turn-helix motifs in tandem. It is structurally akin to the AAA+ protein family (ATPases associated with diverse cellular activities) [1].

1: Multiple complexes of long aliphatic N-acyltransferases lead to synthesis of 2,6-diacylated/2-acyl-substituted glycopeptide antibiotics, effectively killing vancomycin-resistant enterococcus. Lyu SY, Liu YC, Chang CY, Huang CJ, Chiu YH, Huang CM, Hsu NS, Lin KH, Wu CJ, Tsai MD, Li TL; J Am Chem Soc. 2014;136:10989-10995. PMID:25095906