Journal Article

Human glycogenins maintain glucose homeostasis by regulating glycogen metabolism

Weng, Tzu-Han, Tsai, Su-Yi, Lee, Ying-Ting, Tseng, Yu-Ting, Chen, Ying-Chen, Hsiao, Wen-Po, Hsia, Kuo-Chiang, Pien, Yu-Chung, Chen, Ching-Jou, Lin, Sung-Jan, Yen, Hsin-Yung, Chen, Po-Pang, Hsu, Tzu-Han, Chen, Yao-Chi, Lim, Carmay, Chen, Yi-An

2025

Overview

Proper regulation of glycogen metabolism is fundamental to cellular energy homeostasis, and its disruption is associated with various metabolic disorders, including glycogen storage diseases (GSDs) and potentially diabetes. Despite glycogen’s role as an essential energy reservoir, the mechanisms governing its synthesis and structural diversity across tissues remain unclear. Here, we uncover the distinct physiological roles of the human glycogenins GYG1 and GYG2 in glycogen synthesis. Through cellular models, structural biology, and biochemical analyses, we demonstrate that, unlike GYG1, GYG2 exhibits minimal autoglycosylation activity and acts as a suppressor of glycogen formation. Together, these two glycogenins coordinate glycogen synthase activity and influence glycogen assembly in a cell-type-dependent manner. Importantly, these glycogenins modulate glucose metabolic pathways, thereby ensuring cellular glucose homeostasis. These findings address longstanding questions in glycogen metabolism and establish both GYG1 and GYG2 as critical regulators of glycogen synthesis and breakdown in human, providing insights with potential therapeutic implications for treating GSDs and metabolic diseases. Glycogenin initiates glycogen synthesis, but its two human isoforms may do more than expected. Here, Weng et al. reveal that GYG2, despite low enzyme activity, drives glycogen particle assembly, uncovering a new layer of metabolic control.

• Publisher: Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
• Subject: 13/100 / 13/106 / 13/31 / 631/535/1258/1259 / 631/80/221 / 631/80/304 / 692/699/317 / Cell Line / Cellular structure / Cloning / Diabetes mellitus / Energy / Energy balance / Enzymatic activity / Enzyme activity / Enzymes / Glucose / Glucose - metabolism / Glucosyltransferases - chemistry / Glucosyltransferases - metabolism / Glycogen / Glycogen - metabolism / Glycogen synthase / Glycogenosis / Glycogens / Glycoproteins - chemistry / Glycoproteins - metabolism / Glycosylation / Homeostasis / Human Embryonic Stem Cells - metabolism / Humanities and Social Sciences / Humans / Isoforms / Liver / Metabolic disorders / Metabolic pathways / Metabolism / Models, Molecular / multidisciplinary / Musculoskeletal system / Mutation / Particle Size / Phosphorylation / Protein Binding / Protein Structure, Quaternary / Protein Structure, Tertiary / Proteins / Science / Science (multidisciplinary) / Stem cells / Storage diseases / Synthesis