Predict translation initiation rate (OSTIR)
rbs_predictPredict the translation initiation rate at each start codon in a bacterial mRNA using OSTIR, the open-source continuation of the Salis lab RBS Calculator, with ViennaRNA free energies. Returns the predicted rate plus the full thermodynamic breakdown (16S rRNA:mRNA hybridisation, mRNA unfolding, spacing, standby site, start-codon binding) for every start codon found. Rates are on an arbitrary scale — compare them as ratios, not as absolute expression levels. Runs ViennaRNA on a shared service and is therefore rate limited (see 429/503). PREDICTED, NOT MEASURED (Spearman ρ = 0.39 on two 5' UTR datasets it was not fitted to). Spearman ρ = 0.39 against measured expression on two 5' UTR datasets it was not fitted to (Gilliot & Gorochowski, Nucleic Acids Res 2024;52(13):e58). The widely quoted 53% within 2-fold / 91% within 10-fold are calibration residuals on the fitting set, not held-out validation. Valid for: translation INITIATION only, in E. coli-like Gram-negative hosts (the model is parameterised on the E. coli anti-Shine-Dalgarno sequence). Rankings within one construct context; the absolute value has no units and no meaning.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| end | No | Optional 1-based position; only consider start codons beginning at or before it. | |
| start | No | Optional 1-based position; only consider start codons beginning at or after it. | |
| sequence | Yes | mRNA sequence, raw or FASTA — the 5' UTR plus at least the start of the CDS. DNA (T) and RNA (U) are both accepted and scored identically. A, C, G, T/U only. Max 3,000 nt. | |
| antiShineDalgarno | No | Optional anti-Shine-Dalgarno sequence (the 16S rRNA 3' end) to model a non-E. coli host. Omit to use OSTIR's own E. coli default. |