This domain is found at the C-terminal of bacterial regulatory ATPase RavA (Regulatory ATPase variant A) [1,2] and is the second subdomain that forms the discontinuous triple helical domain [1]. RavA forms an hexamer in which the triple helical domain mediates the lateral interactions between neighbouring RavA monomers [2].

1: Structure of RavA MoxR AAA+ protein reveals the design principles of a molecular cage modulating the inducible lysine decarboxylase activity. El Bakkouri M, Gutsche I, Kanjee U, Zhao B, Yu M, Goret G, Schoehn G, Burmeister WP, Houry WA; Proc Natl Acad Sci U S A. 2010;107:22499-22504. PMID:21148420

2: Structural insights into ATP hydrolysis by the MoxR ATPase RavA and the LdcI-RavA cage-like complex. Jessop M, Arragain B, Miras R, Fraudeau A, Huard K, Bacia-Verloop M, Catty P, Felix J, Malet H, Gutsche I; Commun Biol. 2020;3:46. PMID:31992852