Table 2. Highly detected transport proteins and their substrates.
Substrate | No. of eCDSsa | No. of peptidesb | No. of clustersc | No. of spectrad |
---|---|---|---|---|
Amino acids | 480 | 345 | 6 | 775 |
Carboxylates | 673 | 480 | 3 | 861 |
Nitrate/sulfonate/ bicarbonate | 3 | 5 | 1 | 6 |
Peptides | 107 | 111 | 2 | 173 |
Phosphonate | 8 | 9 | 1 | 12 |
Polyamines | 148 | 118 | 2 | 232 |
Porin | 58 | 37 | 3 | 67 |
Proline/glycine betaine | 240 | 149 | 1 | 294 |
Sugars | 400 | 351 | 3 | 742 |
Unknown symporter | 40 | 7 | 1 | 7 |
Taurine | 121 | 66 | 1 | 156 |
Unknown | 463 | 292 | 13 | 502 |
Abbreviation: eCDSs, protein-coding sequences.
Translated environmental protein-coding sequences with given transport function as determined by BLASTP.
Unique peptide sequences detected that mapped to the identified eCDSs.
Clusters described by Yooseph et al. (2007).
Mass spectra that matched to peptides of the identified eCDSs.