Tubulin beta chain is a 445-residue protein from Sus scrofa. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P02554.
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The mean pLDDT of this model is 91.8 (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 | 82% |
| 70 to 90 | Confident: backbone generally right | 14% |
| 50 to 70 | Low: treat with caution | 3% |
| Below 50 | Very low: often disordered regions | 2% |
What pLDDT means and how to read it
Tubulin is the major constituent of microtubules, a cylinder consisting of laterally associated linear protofilaments composed of alpha- and beta-tubulin heterodimers (PubMed:7225365). Microtubules grow by the addition of GTP-tubulin dimers to the microtubule end, where a stabilizing cap forms (PubMed:7225365). Below the cap, tubulin dimers are in GDP-bound state, owing to GTPase activity of alpha-tubulin (PubMed:7225365)
Dimer of alpha and beta chains (PubMed:7225365). A typical microtubule is a hollow water-filled tube with an outer diameter of 25 nm and an inner diameter of 15 nM. Alpha-beta heterodimers associate head-to-tail to form protofilaments running lengthwise along the microtubule wall with the beta-tubulin subunit facing the microtubule plus end conferring a structural polarity. Microtubules usually…
Cytoplasm, cytoskeleton
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 6TIW | EM | 1.09 Å | B=1-429 |
| 9U6A | X-ray | 1.92 Å | B=1-431 |
| 5YL2 | X-ray | 2.09 Å | B/D=1-445 |
| 7TTF | X-ray | 2.1 Å | B/D=1-433 |
| 5XKG | X-ray | 2.2 Å | B/D=1-445 |
| 7L05 | X-ray | 2.21 Å | B/D=1-445 |
| 5JQG | X-ray | 2.24 Å | B/D=1-445 |
| 5XKH | X-ray | 2.25 Å | B/D=1-445 |
| 7TTD | X-ray | 2.27 Å | B/D=1-433 |
| 5JCB | X-ray | 2.3 Å | B/D=1-445 |
| 5XP3 | X-ray | 2.3 Å | B/D=1-445 |
| 6BR1 | X-ray | 2.3 Å | B/D=1-445 |
| 6O5M | X-ray | 2.3 Å | B/D=1-445 |
| 6XES | X-ray | 2.32 Å | B/D=1-433 |
| 7EMJ | X-ray | 2.33 Å | B/D=1-445 |
| 7XQY | X-ray | 2.35 Å | B/D=1-445 |
| 7DAE | X-ray | 2.39 Å | B/D=1-445 |
| 7EXC | X-ray | 2.39 Å | B/D=1-445 |
| 6LS4 | X-ray | 2.4 Å | B/D=1-445 |
| 6NNG | X-ray | 2.4 Å | B/D=1-445 |
Showing 20 of 205 experimental structures (best resolution first).
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