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Volumn 279, Issue 5348, 1998, Pages 199-202

Engineering broader specificity into an antibiotic-producing polyketide synthase

Author keywords

[No Author keywords available]

Indexed keywords

AVERMECTIN; ERYTHROMYCIN; MACROLIDE;

EID: 0032498205     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.279.5348.199     Document Type: Article
Times cited : (212)

References (48)
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    • note
    • Single-letter abbreviations for the amino acid residues are as follows: A, Ala; C, Cys; D, Asp; E, Glu; F, Phe; G, Gly; H, His; I, Ile; K, Lys; L, Leu; M, Met; N, Asn; P, Pro; Q, Gln; R, Arg; S, Ser; T, Thr; V, Val; W, Trp; and Y, Tyr.
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    • note
    • 18 column (12.5 mm by 250 mm)]. After the initial chromatography, erythromycin mixtures were analyzed by both liquid chromatography MSMS and high-resolution ESMS, and data were obtained for compounds 5 through 13, which verified the mass of each parent ion as that of the proton adduct (27). This high-resolution analysis was extended to the proton adducts generated by ESMSMS of daughter ions formed by the loss of water and to the neutral sugars of 5 through 13 (27). In addition, 2D NMR data were obtained for the fully purified compound 12 (28). The combined yield of 5 through 13 obtained from these fermentations was typically 2 mg/liter. Purified samples of 8 and 9 were assayed against erythromycin A (1) in a B. subtilis bioassay (29); these new antibiotics were found to be of comparable potency to 1.
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    • The isolated compounds 1 and 2 gave identical physical and spectroscopic data to that published elsewhere (7, 9). The spectra of the newly identified triketide lactones 3 and 4 were assigned using 2D COSY and were identical to that of synthetic samples (23). Supplementary material is available at
    • The isolated compounds 1 and 2 gave identical physical and spectroscopic data to that published elsewhere (7, 9). The spectra of the newly identified triketide lactones 3 and 4 were assigned using 2D COSY and were identical to that of synthetic samples (23). Supplementary material is available at www.sciencemag.org/feature/data/974306.shl#22
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    • 2O) and loss of the neutral sugar [-158 (cladinose) for erythromycin A and B analogs; -144 (mycarose) for erythromycin D analogs]. Supplementary material is available at www.sciencemag.org/feature/data/ 974306.shl#27
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    • The spectrum of 12 was assigned using 2D COSY. Supplementary material is available at
    • The spectrum of 12 was assigned using 2D COSY. Supplementary material is available at www. sciencemag.org/feature/data/974306.shl#28
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    • note
    • Supported by a project grant from the U.K. Biotechnology and Biological Sciences Research Council. Biotechnology Directorate. We thank P. Skelton and J. B. Lester for assistance with, respectively, mass spectrometry and DNA sequencing; A. L. Cutter for authentic samples of triketide lactones; H. A. I. McArthur and J. Dirlam for helpful discussions; and D. Hopwood and C. Khosla for the kind provision of S. coelicolor CH999 and plasmid pRM5. We also wish to thank Pfizer Central Research for assistance in the scale-up and isolation of some of the novel compounds, and I. Parsons and D. M. Rescek for NMR data.


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