Example 3

To make a screening strain to rapidly screen for RebA to RebD conversion in vivo, a landing pad was inserted into the RebA strain described above. The landing pad consisted of 500 bp of locus-targeting DNA sequences on either end of the construct to the genomic region downstream of the ALG1 open reading frame (FIG. 4). Internally, the landing pad contained a PGAL1 promoter and a yeast terminator flanking an endonuclease recognition site (F-CphI).

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