Phytase Mutant Disulfide Bonding for High-Temperature Stability

The patent applies local quality by introducing disulfide bonds at specific local positions (cysteine mutations at predetermined sites) within the phytase protein structure. This targeted approach ensures that cross-linking occurs only at strategically chosen locations that stabilize the enzyme without disrupting its catalytic function, thereby improving thermal stability while maintaining enzyme activity.

The patent employs parameter changes by systematically varying the positions of cysteine mutations to create different mutant variants. By changing the location parameters of disulfide bond formation, the researchers optimized the balance between thermal stability and enzyme activity, ultimately identifying the combination of mutations that provides the best performance.

The patent applies preliminary action by using bioinformatics analysis and molecular dynamics simulations to pre-identify optimal mutation sites before conducting experiments. This preliminary computational screening reduces the complexity of site selection by narrowing down the numerous possible cysteine positions to a focused set of predetermined sites most likely to improve thermal stability.

The patent employs copying by using computational models and simulated structures to predict the effects of various mutation combinations. These virtual copies and simulations allow researchers to screen multiple mutation scenarios in silico before implementing them experimentally, significantly reducing the complexity of identifying effective mutation sites.