Sandbox Reserved 1846: Difference between revisions

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Two wild-type residues, S283 and D238, were engineered to form a disulfide bond by replacing them with cysteine. The distances between the alpha and beta atoms suggested that this mutation could enable the formation of a disulfide bond. The wild-type protein has a melting point of 84.7°C, while the cysteine mutation increased the melting point to 94.5°C, a 9.8°C improvement—higher than any other mutations. However, this increase in stability was accompanied by a 28% decrease in enzymatic activity compared to the wild-type.
Two wild-type residues, S283 and D238, were engineered to form a disulfide bond by replacing them with cysteine. The distances between the alpha and beta atoms suggested that this mutation could enable the formation of a disulfide bond. The wild-type protein has a melting point of 84.7°C, while the cysteine mutation increased the melting point to 94.5°C, a 9.8°C improvement—higher than any other mutations. However, this increase in stability was accompanied by a 28% decrease in enzymatic activity compared to the wild-type.
This demonstrates why multiple mutations are often combined: to improve thermostability while maintaining or boosting catalytic activity. As the mutations target different sites, they can be used together based on the desired effect.


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