Table 2 Codon usage in the 13 protein-encoding genes of the Urechis caupo mitochondrial genome. The total number of codons is 3722. The anticodon of the corresponding tRNA gene is shown in parentheses below each amino acid designation. Stop codons are not included in this analysis.
From: Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
Amino acid | Codon | N | % | Amino acid | Codon | N | % |
|---|---|---|---|---|---|---|---|
Phe (F) | TTT | 161 | 4.3% | Ser (S2) | TCT | 108 | 2.9% |
(GAA) | TTC | 115 | 3.1% | (TGA) | TCC | 65 | 1.7% |
Leu (L2) | TTA | 146 | 3.9% | Â | TCA | 74 | 2.0% |
(TAA) | TTG | 10 | 0.3% | Â | TCG | 3 | 0.1% |
Tyr (Y) | TAT | 42 | 1.1% | Cys (C) | TGT | 18 | 0.5% |
(GTA) | TAC | 65 | 1.7% | (GCA) | TGC | 11 | 0.3% |
TER | TAA | --- | --- | Trp (W) | TGA | 77 | 2.1% |
| Â | TAG | --- | --- | (TCA) | TGG | 21 | 0.6% |
Leu (L1) | CTT | 105 | 2.8% | Pro (P) | CCT | 72 | 1.9% |
(TAG) | CTC | 62 | 1.7% | (TGG) | CCC | 44 | 1.2% |
| Â | CTA | 224 | 6.0% | Â | CCA | 80 | 2.1% |
| Â | CTG | 38 | 1.0% | Â | CCG | 6 | 0.2% |
His (H) | CAT | 33 | 0.9% | Arg (R) | CGT | 6 | 0.2% |
(GTG) | CAC | 55 | 1.5% | (TCG) | CGC | 5 | 0.1% |
Gln (Q) | CAA | 84 | 2.3% | Â | CGA | 46 | 1.2% |
(TTG) | CAG | 12 | 0.3% | Â | CGG | 9 | 0.2% |
Ile (I) | ATT | 200 | 5.4% | Thr (T) | ACT | 76 | 2.0% |
(GAT) | ATC | 100 | 2.7% | (TGT) | ACC | 91 | 2.4% |
Met (M) | ATA | 171 | 4.6% | Â | ACA | 93 | 2.5% |
(CAT) | ATG | 52 | 1.4% | Â | ACG | 5 | 0.1% |
Asn (N) | AAT | 61 | 1.6% | Ser (S1) | AGT | 7 | 0.2% |
(GTT) | AAC | 65 | 1.7% | (TCT) | AGC | 16 | 0.4% |
Lys (K) | AAA | 78 | 2.1% | Â | AGA | 62 | 1.7% |
(TTT) | AAG | 14 | 0.4% | Â | AGG | 8 | 0.2% |
Val (V) | GTT | 49 | 1.3% | Ala (A) | GCT | 75 | 2.0% |
(TAC) | GTC | 28 | 0.8% | (TGC) | GCC | 75 | 2.0% |
| Â | GTA | 99 | 2.7% | Â | GCA | 122 | 3.3% |
| Â | GTG | 18 | 0.5% | Â | GCG | 14 | 0.4% |
Asp (D) | GAT | 23 | 0.6% | Gly (G) | GGT | 14 | 0.4% |
(GTC) | GAC | 37 | 1.0% | (TCC) | GGC | 27 | 0.7% |
Glu (E) | GAA | 73 | 2.0% | Â | GGA | 127 | 3.4% |
(TTC) | GAG | 10 | 0.3% | Â | GGG | 36 | 1.0% |