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Semisynthesis Of Mycothiazole Analogs Having Distinct Bioactivity.

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Semisynthesis Of Mycothiazole Analogs Having Distinct Bioactivity.

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Semisynthesis of Mycothiazole Analogs having Distinct Bioactivity.

Jacqueline G Clarke¹, Naibedya Dutta², Matthew S Nickel¹

¹Department of Natural Sciences & Mathematics, Dominican University of California, San Rafael, California 94901, United States.

ACS Medicinal Chemistry Letters

|June 17, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

Semisynthetic modification of mycothiazole yielded unexpected diastereomers lacking the diene. These analogs showed reduced stability but varied cytotoxicity against pancreatic and glioblastoma cancer cells, highlighting stereochemistry

Keywords:

C. elegans cancer cell lines diastereomers diene mycothiazole

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Area of Science:

Medicinal Chemistry
Organic Synthesis
Pharmacology

Background:

Mycothiazole (1) is a natural product with potential therapeutic applications.
Semisynthetic modifications aim to enhance stability and potency of bioactive compounds.
8-O-acetylmycothiazole (2) serves as a benchmark for analog development.

Purpose of the Study:

To synthesize a more stable and/or potent analog of mycothiazole (1).
To investigate the impact of semisynthetic modification on mycothiazole's structure and bioactivity.
To evaluate the cytotoxic and in vivo effects of novel mycothiazole diastereomers.

Main Methods:

Semisynthetic modification of mycothiazole (1) using Meerwein's salt.
Structural elucidation using NMR, HR-LCMS, and optical rotation.

In vitro cytotoxicity assays against PANC-1 and U251N cancer cell lines.

In vivo aging studies in Caenorhabditis elegans to assess mitochondrial function and lifespan.

Main Results:

Unexpected formation of diastereomers (5a, 5b) lacking the diene moiety.
Compounds 5a and 5b exhibited reduced stability compared to parent compounds 1 and 2.
Significant differences in cytotoxic potency were observed between 5a and 5b against pancreatic and glioblastoma cells.
In vivo studies revealed 5b inhibited mitochondrial function in C. elegans, while neither analog affected lifespan.

Conclusions:

The diene in mycothiazole (1) may be crucial for its high cytotoxic potency and lifespan effects.
Minor stereochemical variations in mycothiazole analogs can significantly modulate bioactivity.
Further investigation of stereochemistry is warranted for optimizing mycothiazole chemotypes.