The research outlined in this proposal is aimed at elucidating the mode of biosynthesis of a number of antibiotics. Compounds and problems to be studied include the enzymology of formation of pyrrolnitrin and dihydrophenylalanine, the formation of cyclohexane rings in ansatrienin and asukamycin, the formation of mC7N units in ansatrienin, naphthomycin and/or rifamycin on the one hand, and in asukamycin and manumycin on the other, the mode of polyketide assembly in lysolipin and in the macrodiolide aplasmomycin, as well as the biosynthesis of reductiomycin, the novel phenazine antibiotics, the esmeraldins and saphenamycins, and the modified peptide antibiotics nosiheptide and thiostrepton. The results are expected to answer fundamental questions in antibiotic biosynthesis and lay the ground work for biological structure modification of complex antibiotics based on biosynthetic information. The methods to be used include (a) feeding experiments with precursors labeled with radioactive (14C, 3H) and/or stable (13C, 15N, 18O, 2H) isotopes and extensive use of Fourier- transform NMR spectroscopy for product analysis, (b) synthesis of potential pathway intermediates and their evaluation in whole cell or cell-free experiments, (c) isolation of enzymes carrying out some of these transformations and (d) synthesis and use of stereospecifically labeled substrates to probe the stereochemistry and mechanism of some of the biosynthetic reactions.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI020264-11
Application #
3129832
Study Section
Bio-Organic and Natural Products Chemistry Study Section (BNP)
Project Start
1987-12-01
Project End
1994-03-31
Budget Start
1993-04-01
Budget End
1994-03-31
Support Year
11
Fiscal Year
1993
Total Cost
Indirect Cost
Name
University of Washington
Department
Type
Schools of Arts and Sciences
DUNS #
135646524
City
Seattle
State
WA
Country
United States
Zip Code
98195
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Xu, Jun; Wan, Eva; Kim, Chang-Joon et al. (2005) Identification of tailoring genes involved in the modification of the polyketide backbone of rifamycin B by Amycolatopsis mediterranei S699. Microbiology 151:2515-28
Xu, Jun; Mahmud, Taifo; Floss, Heinz G (2003) Isolation and characterization of 27-O-demethylrifamycin SV methyltransferase provides new insights into the post-PKS modification steps during the biosynthesis of the antitubercular drug rifamycin B by Amycolatopsis mediterranei S699. Arch Biochem Biophys 411:277-88
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Floss, H G (2001) Antibiotic biosynthesis: from natural to unnatural compounds. J Ind Microbiol Biotechnol 27:183-94
Yu, T W; Muller, R; Muller, M et al. (2001) Mutational analysis and reconstituted expression of the biosynthetic genes involved in the formation of 3-amino-5-hydroxybenzoic acid, the starter unit of rifamycin biosynthesis in amycolatopsis Mediterranei S699. J Biol Chem 276:12546-55

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