This is a family of glycosyl-hydrolases of the CAZy GH130 family. Several have been characterised as mannosylglucose phosphorylase [2,3,4]. This enzyme is part of the mannan catalytic pathway and feeds into the glycolysis cycle [2]. Specifically it catalyses the reversible phosphorolysis of beta-1,4-D-mannosyl-N-acetyl-D-glucosamine [4]. This family was noted to belong to the Beta fructosidase superfamily in [1].

1: beta-fructosidase superfamily: homology with some alpha-L-arabinases and beta-D-xylosidases. Naumoff DG; Proteins. 2001;42:66-76. PMID:11093261

2: New microbial mannan catabolic pathway that involves a novel mannosylglucose phosphorylase. Senoura T, Ito S, Taguchi H, Higa M, Hamada S, Matsui H, Ozawa T, Jin S, Watanabe J, Wasaki J, Ito S; Biochem Biophys Res Commun. 2011;408:701-706. PMID:21539815

3: Metabolic mechanism of mannan in a ruminal bacterium, Ruminococcus albus, involving two mannoside phosphorylases and cellobiose 2-epimerase: discovery of a new carbohydrate phosphorylase, beta-1,4-mannooligosaccharide phosphorylase. Kawahara R, Saburi W, Odaka R, Taguchi H, Ito S, Mori H, Matsui H; J Biol Chem. 2012;287:42389-42399. PMID:23093406

4: Discovery of beta-1,4-D-mannosyl-N-acetyl-D-glucosamine phosphorylase involved in the metabolism of N-glycans. Nihira T, Suzuki E, Kitaoka M, Nishimoto M, Ohtsubo K, Nakai H; J Biol Chem. 2013;288:27366-27374. PMID:23943617