This presumed domain is found at the C-terminus of a glutaminase protein from fungi [1]. This domain is also found as a single domain protein in Bacteroides thetaiotaomicron.

1: Molecular cloning and characterization of a gene encoding glutaminase from Aspergillus oryzae. Koibuchi K, Nagasaki H, Yuasa A, Kataoka J, Kitamoto K; Appl Microbiol Biotechnol. 2000;54:59-68. PMID:10952006