Abstract
Cyclosporin A, a potent and clinically-important immunosuppressive drug (SandimmunR), is synthesized from its precursor amino acids by cyclosporin synthetase, a single multi-functional enzyme. In this study we report the cloning of the corresponding coding region of this synthetase. It contains an open reading frame of 45.8 kb which encodes a peptide with a calculated Mr of 1 689 243. The predicted gene product contains 11 aminoacid-activating domains that are very similar to one another and to the domains of other peptide synthetases. Seven of these domains harbour N-methyltransferase functions. This is the largest genomic ORF described so far.
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Weber, G., Schörgendorfer, K., Schneider-Scherzer, E. et al. The peptide synthetase catalyzing cyclosporine production in Tolypocladium niveum is encoded by a giant 45.8-kilobase open reading frame. Curr Genet 26, 120–125 (1994). https://doi.org/10.1007/BF00313798
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DOI: https://doi.org/10.1007/BF00313798