Question

$\alpha$ -Amylose is an unbranched glucose polymer. Why would this polymer not be as effective a storage form of glucose as glycogen?

   $\alpha$ -Amylose is an unbranched glucose polymer. Why would this polymer not be as effective a storage form of glucose as glycogen?

Biochemistry

Jeremy M. Berg, John… 8th Edition

Chapter 21, Problem 4

Instant Answer

Solved by Expert Prashant Bana

01/10/2021

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This means that it has only one end where the enzyme glycogen phosphorylase can act to degrade it. Show more…

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$\alpha$ -Amylose is an unbranched glucose polymer. Why would this polymer not be as effective a storage form of glucose as glycogen?

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Key Concepts

Polymer Branching

Branching in polysaccharides refers to the way glucose units are attached at various points along the polymer chain. In glycogen, the highly branched structure creates many non-reducing ends, which allow enzymes rapid and simultaneous access to multiple cleavage points. This structural feature significantly speeds up both the synthesis and breakdown of the molecule, making it a more efficient storage form of glucose compared to unbranched polymers.

Enzymatic Accessibility

Enzymatic accessibility pertains to how easily enzymes can access and cleave the glycosidic bonds in a polymer. The numerous branch points in glycogen increase the surface area and create multiple attack sites for degrading enzymes, thereby allowing for a quicker mobilization of glucose when energy is required. In contrast, the linear structure of amylose has fewer terminal ends available for rapid enzymatic action, making it less effective for quick glucose release.

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