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- amino-acids
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# Protein Data Stability - Single Mutation

This repository contains data on the change in protein stability with a single mutation.

## Attribution of Data Sources

- **Primary Source**: Tsuboyama, K., Dauparas, J., Chen, J. et al. Mega-scale experimental analysis of protein folding stability in biology and design. Nature 620, 434–444 (2023). [Link to the paper](https://www.nature.com/articles/s41586-023-06328-6)
- **Dataset Link**: [Zenodo Record](https://zenodo.org/record/7992926)

As to where the dataset comes from in this broader work, the relevant dataset (#3) is shown in `dataset_table.jpeg` of this repository's files.

## Sample Protein Stability Data

| Base Amino Acid Sequence                                                   | Mutation | ddG_ML                 | Classification |
|---------------------------------------------------------------------------|----------|------------------------|----------------|
| DEIHIHFNGVTIEFRGLTEEAKKALEEAIKRGASEEELKELARRLIK                            | base     | -0.0675543480388345    | neutral        |
| DEIHIHFNGVTIEFRGLTEEAKKALEEAIKRGASEEELKELARRLIK                            | D1Q      | -0.0162349479755414    | neutral        |
| DEIHIHFNGVTIEFRGLTEEAKKALEEAIKRGASEEELKELARRLIK                            | D1E      | -0.1402534094665108    | neutral        |
| DEIHIHFNGVTIEFRGLTEEAKKALEEAIKRGASEEELKELARRLIK                            | D1N      | 0.0126650189159422     | neutral        |
| DEIHIHFNGVTIEFRGLTEEAKKALEEAIKRGASEEELKELARRLIK                            | D1H      | 0.1970434798619962     | neutral        |

## Dataset Structure

The dataset focuses on the differential deltaG (mutation minus base) of various protein mutations.

- **Base Protein Sequence** (`aa_seq`): A (sometimes shortened) amino acid sequence.
- **Mutation**: Represented as a combination of amino acid and its position (e.g., F10N indicates changing the 10th amino acid (F) in a sequence for N).
- **delta deltaG** (`ddG_ML`): Derived from a model that makes use of stability measurements measured by two proteases, trypsin and chymotrypsin.
- **Classification**: Classification is done purely on the basis of ddG. The standard deviation of ddG in the dataset is measured and:
-- Rows above 0.5 standard deviations are classified as 'destabilising'
-- Rows below -0.5 standard deviations are classified as 'stabilising'
-- Rows between -0.5 and 0.5 standard deviations are classified as 'neutral'
  
### Understanding ΔG (delta G)

ΔG is the Gibbs free energy change of a process, dictating whether a process is thermodynamically favorable:

- **Negative ΔG**: Indicates the process is energetically favorable. For protein folding, it implies the protein is stable in its folded form.
- **Positive ΔG**: Indicates the process is not energetically favorable. In protein folding, it means the protein requires energy to maintain its folded state.

The **delta delta G** (ΔΔG) represents the deltaG of the mutation compared to the base protein:

- **Positive ΔΔG**: Suggests the mutation decreases protein stability.
- **Negative ΔΔG**: Suggests the mutation enhances protein stability.

### Data Cleanup and Validation:

1. Filtering: The dataset has been curated to only include examples of single mutations.
2. Consistency Check: Only rows with consistent mutation indication, aligned with both the base and mutated sequences, have been retained.