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Which of the following enzymes are not a part of hemicellulase?

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Which of the following enzymes are not a part of hemicellulase?

(a) xylan endo-1,3-b-xylosidase

(b) xylan 1,4-b-xylosidase

(c) Pectinesterase

(d) L- rabinofuranosidase

I got this question in an international level competition.

This intriguing question comes from Large Scale Use of Enzyme in portion Large Scale Use of Enzyme in Solution of Enzyme Technology

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The correct answer is (c) Pectinesterase

For explanation I would say: Pectinesterase is not a part of hemicellulases and releases methanol from the pectyl methyl esters. Hemicellulase is a mixture of hydrolytic enzymes which includes xylan endo-1,3-b-xylosidase (EC 3.2.1.32), xylan 1,4-b-xylosidase (EC 3.2.1.37) and a-L- rabinofuranosidase (EC 3.2.1.55). Hemicellulase is not a pectinase strictly, but its presence helps reduce hemicellulose levels.

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