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Biosynthesis of dTDP-β-l-4-O-methyl-digitoxose in selvamicin-producing Pseudonocardia species. It is possible that methylation occurs after transfer of the l-digitoxosyl residue to the macrolactone. The abbreviations used are as follows: 2,3-DH, dTDP-4-keto-6-deoxyhexose 2,3-dehydratase; 3 KR, dTDP-3,4-diketo-2,6-dideoxyhexose 3-ketoreductase; 5 EPIM, dTDP-4-keto-2,6-dideoxyhexose C5 epimerase; 4KR, dTDP-4-keto-2,6-dideoxyhexose 4 ketoreductase.
