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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Stereochemical integrity of oxazolone ring-containing jadomycins
Charles N Borissow1, Cathy L Graham, Ray T Syvitski
1College of Pharmacy, Burbidge Building, Dalhousie University, 5968 College Street, Halifax, Nova Scotia, B3H 3J5, Canada.
Jadomycins, natural products from Streptomyces venezuelae, feature a unique oxazolone ring. Their biosynthesis and cytotoxicity reveal that alpha-carbon substitution, not stereochemistry, impacts biological activity.
Area of Science:
- Natural Product Biosynthesis
- Chemical Biology
- Drug Discovery
Background:
- Jadomycins are angucycline natural products from *Streptomyces venezuelae*.
- These compounds possess a unique oxazolone ring formed via amino acid condensation.
- Understanding jadomycin biosynthesis and structure-activity relationships is crucial for potential therapeutic applications.
Purpose of the Study:
- To investigate the biosynthesis of jadomycins, focusing on the incorporation of amino acids.
- To characterize novel E-ring-containing jadomycin analogs.
- To determine the influence of structural modifications on jadomycin cytotoxicity.
Main Methods:
- Precursor-directed biosynthesis using enantiomeric alpha-amino acids.
- Chemical characterization of new jadomycin derivatives.
- Cytotoxicity assays against human breast cancer cell lines.
Main Results:
- *Streptomyces venezuelae* incorporates alpha-amino acids without isomerization.
- Two novel six-membered E-ring jadomycins were characterized.
- Cytotoxicity is primarily influenced by alpha-carbon substitution, not stereochemistry.
Conclusions:
- The biosynthesis of jadomycins is flexible regarding amino acid precursors.
- JadS glycosyltransferase exhibits adaptable substrate specificity.
- Structural modifications at the alpha-carbon are key for optimizing jadomycin anti-cancer activity.
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