Proliferating cell nuclear antigen 2 (PCNA2) is a 264-residue protein from Arabidopsis thaliana. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: Q9ZW35.
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The mean pLDDT of this model is 94.3 (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 | 91% |
| 70 to 90 | Confident: backbone generally right | 6% |
| 50 to 70 | Low: treat with caution | 1% |
| Below 50 | Very low: often disordered regions | 3% |
What pLDDT means and how to read it
Confers DNA tethering and processivity to DNA polymerases and other proteins. Auxiliary protein of DNA polymerase delta and epsilon, is involved in the control of DNA replication by increasing the polymerases' processivity during elongation of the leading strand (By similarity). Appears to function together with POLH/DNA polymerase eta, in the error-prone translesion DNA synthesis (TLS) branch of the DNA damage tolerance (DDT) pathway, to bypass DNA lesions induced by UV irradiation (PubMed:18494853)
Homo- and heterotrimer. Interacts with POLH, ATXR5 and ATXR6
Nucleus
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 2ZVW | X-ray | 2.5 Å | A/B/C/D/E/F/G/H=1-255 |
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