Glycogenin

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Published on August 17, 2021 9:51:50 PM ● Video Link: https://www.youtube.com/watch?v=hLbC8LH01pg

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Glycogenin is an enzyme involved in converting glucose to glycogen. It acts as a primer, by polymerizing the first few glucose molecules, after which other enzymes take over. It is a homodimer of 37-kDa subunits and is classified as a glycosyltransferase.
It catalyzes the chemical reactions:

UDP-alpha-D-glucose + glycogenin ⇌ UDP + alpha-D-glucosylglycogenin
UDP-alpha-D-glucose + a glucosyl-glycogenin ⇌ (1,4-alpha-D-glucosyl)n-glucosyl glucogenin + UDP + H+Thus, the two substrates of this enzyme are UDP-alpha-D-glucose and glycogenin, whereas its two products are UDP and alpha-D-glucosylglycogenin.

Source: https://en.wikipedia.org/wiki/Glycogenin
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