This domain forms an alpha-beta-two layer sandwich. It is found in the Bacillus subtilis proteins anti-sigma-V factor RsiV, which downregulates SigV activity [1], and peptidoglycan-N-acetylmuramic acid deacetylase PdaC, which catalyzes the deacetylation of N-acetylmuramic acid which makes the peptidoglycan resistant to lysosyme [2]. It is found in association with Heat-shock cognate 70kd protein 44kd ATPase, Pfam:PF11738.

1: Identification of sigma(V)-dependent genes of Bacillus subtilis. Zellmeier S, Hofmann C, Thomas S, Wiegert T, Schumann W; FEMS Microbiol Lett. 2005;253:221-229. PMID:16274938

2: Identification and characterization of a novel polysaccharide deacetylase C (PdaC) from Bacillus subtilis. Kobayashi K, Sudiarta IP, Kodama T, Fukushima T, Ara K, Ozaki K, Sekiguchi J; J Biol Chem. 2012;287:9765-9776. PMID:22277649