Myoglobin (MB) is a 154-residue protein from Physeter macrocephalus. This is its AlphaFold structure prediction, created 1 Aug 2025. UniProt accession: P02185.
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The mean pLDDT of this model is 97.5 (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 | 97% |
| 70 to 90 | Confident: backbone generally right | 3% |
| 50 to 70 | Low: treat with caution | 0% |
| Below 50 | Very low: often disordered regions | 0% |
What pLDDT means and how to read it
Monomeric heme protein which primary function is to store oxygen and facilitate its diffusion within muscle tissues. Reversibly binds oxygen through a pentacoordinated heme iron and enables its timely and efficient release as needed during periods of heightened demand. Depending on the oxidative conditions of tissues and cells, and in addition to its ability to bind oxygen, it also has a nitrite reductase activity whereby it regulates the production of bioactive nitric oxide. Under stress conditions, like hypoxia and anoxia, it also protects cells against reactive oxygen species thanks to its pseudoperoxidase activity
Monomeric
Cytoplasm, sarcoplasm
Compare the prediction with experimentally determined structures of the same protein:
| PDB ID | Method | Resolution | Chains and residues |
|---|---|---|---|
| 5YCE | X-ray | 0.77 Å | A=1-154 |
| 7VDN | X-ray | 0.93 Å | A=2-152 |
| 1A6M | X-ray | 1.0 Å | A=2-152 |
| 1NAZ | X-ray | 1.04 Å | A=1-154 |
| 8ESU | X-ray | 1.04 Å | A=1-154 |
| 1A6K | X-ray | 1.1 Å | A=2-152 |
| 2EKT | X-ray | 1.1 Å | A=2-154 |
| 3O89 | X-ray | 1.1 Å | A=2-154 |
| 6M8F | X-ray | 1.1 Å | A=1-154 |
| 9P1F | X-ray | 1.1 Å | A=1-154 |
| 4H07 | X-ray | 1.14 Å | A=1-154 |
| 1A6G | X-ray | 1.15 Å | A=2-152 |
| 1A6N | X-ray | 1.15 Å | A=2-152 |
| 1BZP | X-ray | 1.15 Å | A=2-154 |
| 1BZR | X-ray | 1.15 Å | A=2-154 |
| 1U7R | X-ray | 1.15 Å | A=2-154 |
| 7SLH | X-ray | 1.15 Å | A=1-154 |
| 9P1E | X-ray | 1.15 Å | A=1-154 |
| 7SPF | X-ray | 1.17 Å | A=1-154 |
| 7L3Y | X-ray | 1.18 Å | A=1-154 |
Showing 20 of 357 experimental structures (best resolution first).
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