Table 1.
Representative proteins with rotational symmetry
| Protein | No. of subunits | Rotational symmetry | Reference* |
|---|---|---|---|
| HIV proteinase | 2 | 2 | 3, 4 |
| βB2 crystallin | 2 | 2 | 5 |
| Immunoglobulins | 4 | 2 | 6 |
| Purine nucleoside phosphorylase | 3 | 3 | 7 |
| Porin | 3 | 3 | 8 |
| Hemoglobin | 4 | Three orthogonal 2-fold | 9 |
| Neuraminidase | 4 | 4 | 10 |
| Pentraxins | 5 | 5 | 11, 12 |
| β-Subunit of types 1 and 2 heat-labile enterotoxins and cholera toxin | 5 | 5 | 13 |
| Insulin | 6 | 3- and 2-fold | 14, 15 |
| Limulus C-reactive protein | 6 | 6 | 16 |
| GroEL | 14 | 7 | 17 |
| Aerolysin | 7 | 7 | 18, 19 |
| 20S proteosome | 7 | 7 | 20 |
| Mandelate racemase | 8 | 8 | 21 |
| Light-harvesting complex 2 | 18 | 9 | 22 |
| GTP cyclohydrolase I | 10 | 5- and 2-fold | 23 |
| trp RNA binding attenuating protein | 11 | 11 | 24 |
| Aspartate transcarbamoylase | 12 | 3- and 2-fold | 25 |
| Phaseolin | 12 | Tetramer of trimers | 26 |
| Portal protein of bacteriophage | 13 | 13 | 27 |
| Apoferritin | 24 | 4-, 3-, and 2-fold | 28 |
| Light-harvesting complex 1 | 32 | 16 | 29 |
| Tobacco mosaic virus disc | 34 | 17 | 30 |
| Coat of tomato bushy stunt virus | 180 | 5-, 3-, and 2-fold | 31 |
*
Reference to crystal structure is provided if a crystal structure is available.