TABLE 1.
Numbers of ACA triplets in RNAs involved in protein synthesis in E. coli K-12
| RNA | Length (nucleotides)a | Avg no. of ACAsb | No. of ACA-less RNAs/total no. of genes | Probability of single-strand ACAc | Probability of double-strand ACAc |
|---|---|---|---|---|---|
| tmRNA | 363 | 0 | 1/1 | 0.02 | 0.51 |
| 4.5S RNA | 114 | 0 | 1/1 | 0.73 | 0.70 |
| tRNA | 78.5 | 0.30 | 68/87 | 0.74 | 0.87 |
| 5S rRNA | 120 | 0.13 | 7/8 | 0.49 | 0.83 |
| 16S rRNA | 1,542 | 18.4 | 0/7 | 0.50 | 1.00 |
| 23S rRNA | 2,904 | 32.0 | 0/7 | 0.51 | 1.00 |
| mRNA | 952 | 11.1 | 51/4,243 | 0.21d | NA |
a
For RNAs with more than one gene, we indicate the average length.
b
Total number of ACA triplets found in all genes of each category divided by number of genes in each category.
c
The random probability of ACA was calculated as described in Materials and Methods. NA, not applicable.
d
The random probability of ACA was calculated for the whole RNA and averaged by the total number of mRNAs.