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Fusion protein construction is a widely employed biochemical technique, especially when it comes to multi-component enzymes such as cytochrome P450s. Here we describe a novel method for generating fusion proteins with variable linker lengths, protein fusion with variable linker insertion (P-LinK), which was validated by fusing P450cin monooxygenase (CinA) to the flavodoxin shuttle protein (CinC). CinC was fused to the C terminus of CinA through a series of 16 amino acid linkers of different lengths in a single experiment employing 3 PCR amplifications. Screening for 2-β-hydroxy-1,8-cineole production by CinA-CinC fusion proteins revealed that enzymatically active variants possessed linker lengths of more than 5 amino acids, reaching optimum enzyme activity at a linker length of 10 amino acids. Our P-LinK method not only minimizes experimental effort and significantly reduces time demands but also requires only a single cloning and transformation step in order to generate multiple linker variants (1 to 16 amino acids long), making the approach technically simple and robust.

P-LinK: A method for generating multicomponent cytochrome P450 fusions with variable linker length