SPX domain-containing protein 1 (SPX1) is a 295-residue protein from Oryza sativa subsp. japonica. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q69XJ0.
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The mean pLDDT of this model is 73.9 (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 | 40% |
| 70 to 90 | Confident: backbone generally right | 22% |
| 50 to 70 | Low: treat with caution | 14% |
| Below 50 | Very low: often disordered regions | 24% |
What pLDDT means and how to read it
Involved in plant adaptation to phosphate (Pi) starvation (PubMed:19000161). Inhibits PHR2 DNA-binding activity via a Pi-dependent protein interaction (PubMed:25271318). Suppresses the regulation on expression of PT2 by PHR2 and accumulation of shoot Pi (PubMed:20149131). Optimizes growth under phosphate-limited conditions through a negative feedback loop of the PSI (phosphate starvation-induced) signaling pathway (PubMed:19000161, PubMed:20149131). Regulates the expression of SPX2, SPX3 and SPX5 (PubMed:19566645). May be an important link between signal transduction pathways related to phosphate starvation and cold stress (PubMed:19000161). Together with SPX2, plays a negative role in the…
Interacts (via SPX domain) with PHR2 (via C-terminus) (PubMed:25271318, PubMed:35640569). Interacts with RLI1 in the nucleus to prevents its positive regulation of leaf inclination during phosphate (Pi) starvation (PubMed:29610209, PubMed:35640569)
Nucleus
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 7E40 | X-ray | 2.6 Å | B/D=1-198 |
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