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Related Experiment Video

Updated: Jul 19, 2026

Biochemical Titration of Glycogen In vitro

Biochemical Titration of Glycogen In vitro

Published on: November 24, 2013

Interaction between glycogenin and glycogen synthase.

Alexander V Skurat¹, Amy D Dietrich, Peter J Roach

¹Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202-5122, USA. askurat@iupui.edu

Archives of Biochemistry and Biophysics

|October 24, 2006

Summary

Researchers identified glycogenin-1 and nebulin as glycogen synthase regulators using yeast two-hybrid studies. Glycogenin

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Area of Science:

Biochemistry
Molecular Biology
Metabolic Regulation

Background:

Glycogen synthase is a critical enzyme in regulating glycogen metabolism.
Understanding glycogen synthase regulation is key to metabolic research.
Identifying interacting proteins can elucidate regulatory mechanisms.

Purpose of the Study:

To identify novel regulators of glycogen synthase.
To characterize the interaction between glycogen synthase and its binding partners.
To explore the potential of identified interactions for protein purification.

Main Methods:

Yeast two-hybrid screening was employed to identify protein-protein interactions.
Interaction domains within glycogen synthase and glycogenin were mapped using deletion analysis.
Purification of glycogen synthase was performed using a glycogenin fragment as a reagent.

Main Results:

Two glycogen synthase-interacting proteins, glycogenin-1 and nebulin, were identified in human skeletal muscle.
The interaction between glycogen synthase and glycogenin is mediated by the C-terminal 33 amino acids of glycogenin.
Glycogenin possesses an additional binding site for glycogen synthase beyond its C-terminus, as indicated by binding of full-length glycogenin to a core glycogen synthase segment.

Conclusions:

Glycogenin-1 and nebulin are novel interactors of glycogen synthase.
The C-terminal fragment of glycogenin is sufficient to bind glycogen synthase.
The C-terminal fragment of glycogenin serves as an effective reagent for purifying glycogen synthase from muscle and liver tissues.