Table 2.
Amino acid compositions of total filament proteins and the purified silicateins
| Residue | Composition, mol %
|
|||
|---|---|---|---|---|
| Filament proteins | Silicatein α | Silicatein β | Silicatein γ | |
| Asx | 11.8 | 12.5 | 12.4 | 12.7 |
| Thr | 4.8 | 6.7 | 4.8 | 4.3 |
| Ser | 10.9 | 13.0 | 12.3 | 11.8 |
| Glx | 8.8 | 8.8 | 10.2 | 10.0 |
| Pro | 3.2 | 2.1 | 2.2 | 2.5 |
| Gly | 12.7 | 15.2 | 14.8 | 13.7 |
| Ala | 9.2 | 9.6 | 10.0 | 10.6 |
| Val | 6.4 | 4.1 | 5.7 | 6.3 |
| Met | 2.3 | 1.6 | 1.2 | 1.0 |
| Ile | 4.3 | 4.0 | 3.9 | 4.0 |
| Leu | 6.0 | 7.0 | 6.2 | 7.4 |
| Tyr | 7.9 | 6.3 | 6.6 | 7.8 |
| Phe | 2.8 | 2.4 | 2.5 | 2.2 |
| His | 1.3 | 0.8 | 0.5 | 0.4 |
| Lys | 4.4 | 3.3 | 3.7 | 3.8 |
| Arg | 3.1 | 2.6 | 2.9 | 1.6 |
Amino acid compositions (mol % exclusive of cysteine and tryptophan) were determined after acid hydrolysis (6 M HCl; 24 h at 110°C).