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Novel sulfur-containing rapamycin analogs prepared by precursor-directed biosynthesis
Edmund I Graziani1, Frank V Ritacco, Mia Y Summers
1Department of Chemical & Screening Sciences, Wyeth Research, 401 North Middletown Road, Pearl River, New York 10965, USA. graziaei@wyeth.com
Organic Letters
|July 5, 2003
Summary
Researchers created two new sulfur-containing rapamycin analogs by feeding Streptomyces hygroscopicus cultures specific amino acids. These novel compounds, 20-thiarapamycin and 15-deoxo-19-sulfoxylrapamycin, expand the known rapamycin chemical space.
Area of Science:
- Natural product chemistry
- Microbial fermentation
- Organic synthesis
Background:
- Rapamycin is a potent immunosuppressive natural product with significant therapeutic applications.
- Modifications of rapamycin can lead to analogs with altered or improved properties.
- Streptomyces hygroscopicus is a known producer of rapamycin and can be engineered to produce analogs.
Purpose of the Study:
- To synthesize novel sulfur-containing analogs of rapamycin.
- To explore the structural diversity of rapamycin derivatives.
- To investigate the impact of sulfur incorporation on rapamycin structure.
Main Methods:
- Fermentation of Streptomyces hygroscopicus with specific precursor amino acids (l-nipecotic acid, (S)-1,3-thiazane-4-carboxylic acid, (S)-1,4-thiazane-3-carboxylic acid).
- Isolation and purification of novel compounds from fermentation broths.
- Structure elucidation using advanced spectroscopic techniques (e.g., NMR, Mass Spectrometry).
Main Results:
- Two new sulfur-containing rapamycin analogs were successfully synthesized and isolated.
- The structures were identified as 20-thiarapamycin and 15-deoxo-19-sulfoxylrapamycin.
- Spectroscopic data confirmed the successful incorporation of sulfur into the rapamycin scaffold.
Conclusions:
- Novel sulfur-containing rapamycin analogs can be produced through precursor-directed biosynthesis.
- This study expands the chemical diversity of rapamycin analogs.
- The identified compounds represent new leads for potential therapeutic development.