This is the LARA (LdcI Associating domain of RavA) domain of bacterial regulatory ATPase RavA (Regulatory ATPase variant A) [1,2]. It adopts an unique fold which consists of a compact antiparallel beta-barrel- like structure formed by six beta-strands and one alpha-helix [1,2]. This domain mediates the interaction between RavA and LdcI (inducible lysine decarboxylase) which form a cage-like complex proposed to assist assembly of specific respiratory complexes in E. coli [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