Histone H2A is a 130-residue protein from Homo sapiens. This is its AlphaFold structure prediction, created 1 Jun 2022. UniProt accession: B2R5B3.
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The mean pLDDT of this model is 89.8 (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 | 79% |
| 70 to 90 | Confident: backbone generally right | 3% |
| 50 to 70 | Low: treat with caution | 14% |
| Below 50 | Very low: often disordered regions | 4% |
What pLDDT means and how to read it
Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling
The nucleosome is a histone octamer containing two molecules each of H2A, H2B, H3 and H4 assembled in one H3-H4 heterotetramer and two H2A-H2B heterodimers. The octamer wraps approximately 147 bp of DNA
Chromosome, Nucleus
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 7QXA | EM | 3.2 Å | L=1-130 |
| 9SHZ | EM | 3.2 Å | L=1-130 |
| 9QAX | EM | 3.3 Å | L=1-130 |
| 9SHY | EM | 3.53 Å | L=1-130 |
| 9QAZ | EM | 3.6 Å | L=1-130 |
| 9QAY | EM | 3.8 Å | L=1-130 |
| 9SI0 | EM | 3.8 Å | L=1-130 |
| 7QXB | EM | 3.9 Å | L=1-130 |
| 7QXS | EM | 3.9 Å | L=1-130 |
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