Table 1.
Major characteristics of the 7 polar tube proteins (PTPs) identified in Anncaliia algerae.
| PTP | Accession number | Complete protein | Mature protein | Isoelectric point (pI) | Major amino acid (%) | Number of cysteine residues | Number of potential O-glycosylation sites |
|---|---|---|---|---|---|---|---|
| PTP1 | WAQ68434 | 407 aa | 387 aa (39 kDa) | 4.6 | Pro (32%) | 13 | 57 |
| PTP2* | WAQ68435 | 535 aa | 517 aa (49 kDa) | 9.0 | Gly (25%) | 8 | 93 |
| PTP3 | WAQ68436 | 1203 aa | 1183 aa (127 kDa) | 5.6 | Ala (15%) | 2 | 54 |
| PTP3b | WAQ68437 | 1197 aa | 1182 aa (121 kDa) | 5.0 | Ala (16%) | 5 | 84 |
| PTP4 | WAQ68438 | 254 aa | 241 aa (28 kDa) | 6.8 | Lys (12%) | 5 | 4 |
| PTP5 | WAQ68439 | 240 aa | 240 aa (28 kDa) | 8.9 | Lys (14%) | 8 | 1 |
| PTP7 | WAQ68440 | 417 aa | 402 aa (45.5 kDa) | 6.8 | Thr (11%) | 6 | 23 |
The mature proteins correspond to polypeptides devoid of their predicted N-terminal signal peptide. The pI, major amino acid and numbers of both cysteine residues and potential O-glycosylation sites are deduced from the mature proteins.
PTP polar tube protein, aa amino acids, kDa kilodalton.
*Only the data of a full length PTP2 sequence (PTP2c, see Supplementary Fig S1) are presented.