Question:
Pullulanase enzyme is specific to which type of linkages?
Pullulanase enzyme is specific to which type of linkages?
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In the industrial production of high-fructose corn syrup (HFCS), pullulanase is blended with glucoamylase during the saccharification stage to break branch points, maximizing glucose yield from corn starch.
Updated On: Aug 20, 2026
- \(\alpha\)- 1-6 glycosidic
- \(\beta\)- 1-6 glycosidic
- \(\alpha\)- 2-6 glycosidic
- \(\beta\)- 2-6 glycosidic
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Starch-degrading enzymes are classified based on their substrate specificity and the specific glycosidic bonds they cleave.
Step 2: Detailed Explanation:
- Pullulanase (EC 3.2.1.41) is a specialized "debranching enzyme."
- It specifically hydrolyzes the \(\alpha\)-(1\(\rightarrow\)6)-glycosidic linkages present in pullulan, amylopectin, glycogen, and limit dextrins.
- By cleaving these branch points, it converts branched starch structures into linear chains, which can then be completely broken down into glucose by amylases.
Step 3: Final Answer:
Pullulanase is specific to \(\alpha\)-1-6 glycosidic linkages, which corresponds to option (A).
Starch-degrading enzymes are classified based on their substrate specificity and the specific glycosidic bonds they cleave.
Step 2: Detailed Explanation:
- Pullulanase (EC 3.2.1.41) is a specialized "debranching enzyme."
- It specifically hydrolyzes the \(\alpha\)-(1\(\rightarrow\)6)-glycosidic linkages present in pullulan, amylopectin, glycogen, and limit dextrins.
- By cleaving these branch points, it converts branched starch structures into linear chains, which can then be completely broken down into glucose by amylases.
Step 3: Final Answer:
Pullulanase is specific to \(\alpha\)-1-6 glycosidic linkages, which corresponds to option (A).
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