Glycogenin-1 (GYG1) is a 350-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P46976.
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The mean pLDDT of this model is 84.3 (confident overall). pLDDT is AlphaFold's per-residue confidence score from 0 to 100. In MolViewer, choose the B-factor color scheme to color the model by pLDDT, because AlphaFold stores it in the B-factor column.
| pLDDT band | Meaning | Share of residues |
|---|---|---|
| Above 90 | Very high: backbone and side chains are usually accurate | 57% |
| 70 to 90 | Confident: backbone generally right | 24% |
| 50 to 70 | Low: treat with caution | 10% |
| Below 50 | Very low: often disordered regions | 8% |
What pLDDT means and how to read it
Glycogenin participates in the glycogen biosynthetic process along with glycogen synthase and glycogen branching enzyme. It catalyzes the formation of a short alpha (1,4)-glucosyl chain covalently attached via a glucose 1-O-tyrosyl linkage to internal tyrosine residues and these chains act as primers for the elongation reaction catalyzed by glycogen synthase
Part of the GYS1-GYG1 complex, a heterooctamer composed of a tetramer of GYS1 and 2 dimers of GYG1, where each GYS1 protomer binds to one GYG1 subunit (via GYG1 C-terminus); the GYS1 tetramer may dissociate from GYG1 dimers to continue glycogen polymerization on its own (PubMed:17055998, PubMed:22160680, PubMed:35690592, PubMed:35835870). May also form a heterooctamer complex with GYS2 (via GYG1…
Cytoplasm, Nucleus
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 3U2U | X-ray | 1.45 Å | A/B=1-262 |
| 3U2V | X-ray | 1.5 Å | A/B=1-262 |
| 3U2W | X-ray | 1.68 Å | A/B=1-262 |
| 7OVX | X-ray | 1.7 Å | Q=339-350 |
| 3U2X | X-ray | 1.77 Å | A/B=1-262 |
| 3T7M | X-ray | 1.8 Å | A/B=1-262 |
| 3RMV | X-ray | 1.82 Å | A=1-262 |
| 3T7O | X-ray | 1.85 Å | A/B=1-262 |
| 3RMW | X-ray | 1.93 Å | A=1-262 |
| 3Q4S | X-ray | 1.98 Å | A=1-262 |
| 3T7N | X-ray | 1.98 Å | A/B=1-262 |
| 3U2T | X-ray | 2.05 Å | A=1-262 |
| 6EQJ | X-ray | 2.18 Å | A=1-262 |
| 3QVB | X-ray | 2.26 Å | A=1-262 |
| 6EQL | X-ray | 2.38 Å | A/B=1-262 |
| 7ZBN | EM | 2.62 Å | E/F/G/H=1-350 |
| 7Q0B | EM | 3.0 Å | E/F/G/H=1-350 |
| 7Q13 | EM | 3.0 Å | E/F/G/H=1-350 |
| 8CVX | EM | 3.5 Å | E/F/G/H=1-350 |
| 8CVZ | EM | 3.52 Å | E/F/G/H/I/J=1-350 |
Showing 20 of 23 experimental structures (best resolution first).
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