Table 2. List of available SSP and signaling peptide databases in plants.
SPdb, a signal peptide database containing signal sequences of archaea, prokaryotes, and eukaryotes.
| SSP Databases | MtSSPdb | PlantSSPdb | SPdb | Arabidopsis Unannotated Secreted Peptide Database |
|---|---|---|---|---|
| Last update | 2019 | 2015 | 2008 | 2006 |
| Species | M. truncatula (to be expanded soon to Arabidopsis and B. distachyon) | 32 species, including M. truncatula | Different species including plants and M. truncatula | Arabidopsis |
| M. truncatula SSPs (genome assembly) | 4,439 (Mt3.5v5 and Mt4.0v1) | 820 (Mt3.5v4) | 17 | Not available |
| Annotation | Available | Not available | Not available | Not available |
| Gene family | 262 available with detailed information (function, reference, HMM profile logos, genes, etc.) | 334 available for M. truncatula with limited information | Not available | Not available |
| BLAST (input sequence size) | Available (500 MB) | Available (8 MB) | Not available | Not available |
| Expression data | Available for 16 experiments and 192 conditions | Not available | Not available | Not available |
| Gene Expression Atlas | Available with multiple analyses | Not available | Not available | Not available |
| SSP Prediction tool | Available across multiple plant species and genome scale sequences | Not available | Not available | Not available |
| Synthetic Peptide Library | Available with 155 peptides tested on 3 species for root and nodule-related traits, and SSP order option available | Not available | Not available | Not available |