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to 1.68 A resolution. The enzyme shows a homohexameric structure, which is formed by using two helices attached to the N-terminus and C-terminus as a tab for sticking between subunits. In complexes with substrates, 4-O-beta-D-mannosyl-D-glucose and phosphate, and the product D-mannose-1-phosphate the structures reveal that the invariant residue Asp131, is supposed to be the general acid/base, does not exist close to the glycosidic Glc-O4 atom, which should be protonated in the catalytic reaction
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