Guanine nucleotide-binding protein G(s) subunit alpha (GNAS) is a 394-residue protein from Cricetulus griseus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q8R4A8.
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The mean pLDDT of this model is 91.5 (very high 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 | 81% |
| 70 to 90 | Confident: backbone generally right | 12% |
| 50 to 70 | Low: treat with caution | 4% |
| Below 50 | Very low: often disordered regions | 3% |
What pLDDT means and how to read it
Guanine nucleotide-binding proteins (G proteins) function as transducers in numerous signaling pathways controlled by G protein-coupled receptors (GPCRs). Signaling involves the activation of adenylyl cyclases, resulting in increased levels of the signaling molecule cAMP. GNAS functions downstream of several GPCRs, including beta-adrenergic receptors. Stimulates the Ras signaling pathway via RAPGEF2
Heterotrimeric G proteins are composed of 3 units; alpha, beta and gamma. The alpha chain contains the guanine nucleotide binding site (By similarity). Interacts with CRY1; the interaction may block GPCR-mediated regulation of cAMP concentrations. Interacts with ADCY6 and stimulates its adenylyl cyclase activity (By similarity). Interacts with ADCY2 and ADCY5 (By similarity). Stimulates the…
Cell membrane
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 8I2G | EM | 2.8 Å | A=6-64, A=205-394 |
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