The reconstitution of recombinant protein complexes is facilitated by methods that allow coexpression of their subunits from a single vector. Here we describe a detailed step-by-step protocol for the biGBac cloning method which can be used to generate baculoviral transfer vectors coding for up to 25 subunits of a protein complex (Weissmann et al., Proc Natl Acad Sci U S A 113(19):E2564-E2569, 2016). biGBac is based on Gibson assembly reactions, optimized DNA linker sequences, and uses a hierarchical two-step assembly procedure. In the first assembly step, up to five expression cassettes are combined to generate a polygene cassette. In the second step, up to five polygene cassettes can then be combined to generate transfer vectors coding for up to 25 subunits.
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