Mannan 1,4-mannobiosidase (, ''1,4-β-D-mannan mannobiohydrolase'', ''exo-β-mannanase'', ''exo-1,4-β-mannobiohydrolase'') is an

enzyme An enzyme () is a protein that acts as a biological catalyst by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different mol ...

with

systematic name A systematic name is a name given in a systematic way to one unique group, organism, object or chemical substance, out of a specific population or collection. Systematic names are usually part of a nomenclature. A semisystematic name or semitrivi ...

''4-β-D-mannan mannobiohydrolase''. It catalyses the

hydrolysis Hydrolysis (; ) is any chemical reaction in which a molecule of water breaks one or more chemical bonds. The term is used broadly for substitution reaction, substitution, elimination reaction, elimination, and solvation reactions in which water ...

of (1→4)-β-D-mannosidic linkages in (1→4)-β-D-mannans, to remove successive mannobiose residues from the non-reducing chain ends.

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