This domain is found at the C-terminal end of Beta-N- acetylglucosaminidase from Thermotoga maritima (NagA), which hydrolyses chitooligomers into monomer beta-N-acetylglucosamine. NagA forms a dimer structure in which the monomer structure is organised into an N- and a C-terminal domain (Pfam:PF00933 and this entry, respectively). This domain shows an alpha-beta- alpha-sandwich fold, which comprises six beta-strands with two alpha-helices on either side of the sheet [1,2].

1: The structure of hyperthermophilic beta-N-acetylglucosaminidase reveals a novel dimer architecture associated with the active site. Mine S, Kado Y, Watanabe M, Fukuda Y, Abe Y, Ueda T, Kawarabayasi Y, Inoue T, Ishikawa K; FEBS J. 2014;281:5092-5103. PMID:25227262

2: Crystal structure of beta-N-acetylglucosaminidase CbsA from Thermotoga neapolitana. Kim JS, Yoon BY, Ahn J, Cha J, Ha NC; Biochem Biophys Res Commun. 2015;464:869-874. PMID:26187666