(springer).pdf

Enzymes are biological catalysts that support chemical reactions in living organisms, making them attractive for use in various industries. However, natural enzymes often require modification to be optimal for industrial conditions, involving changes to substrate specificity, expression level, solubility, stability, activity, selectivity, or thermal stability. Protein engineering techniques, including rational design and directed evolution, are used to modify enzymes. Rational design involves introducing mutations at specific places in the protein-encoding gene, while directed evolution involves repeated cycles of random mutagenesis and selection to create a library of genes with improved properties. Both techniques have strengths and limitations, and combining them can be effective. Site-directed mutagenesis is used to enhance biocatalysis, and it involves identifying targets for mutagenesis using sequence- and structure-based strategies. Approaches for selecting targets include focusing on regions related to catalytic properties, identifying conserved sequence motifs, and using random mutagenesis to achieve protein stabilization. Techniques such as alanine scanning, sequence alignment, and structural information are used to identify residues that may influence desired enzyme properties.