Table 2.
Sequence data | Frequency of AAA codon at position +2 |
---|---|
Whole E.coli K12 genome | 440/4241 (10.3%) |
Unverified E.coli signal sequences | 22/45 (48.9%) |
Verified E.coli signal sequences | 16/54 (29.6%) |
E.coli signal sequence data set were obtained from a signal peptide database (http://proline.bic.nus.edu.sg/spdb/). This database currently contains 99 entries of E.coli signal sequences: 54 of the entries are experimentally verified signal sequences (the N-terminal amino acid residues were sequenced), and 45 are computationally predicted sequences (17).