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Incorrectly folded aromatic polyketides from polyketide reductase deficient mutants.
T Kunnari1, K Ylihonko, A Hautala
1Galilaeus Oy, Kaarina, Finland. tero.kunnari@galilaeus.fi
Bioorganic & Medicinal Chemistry Letters
|October 6, 1999
Summary
Ketoreductase deficiency in Streptomyces mutants alters aromatic polyketide biosynthesis. This enzyme activity is crucial for proper polyketide chain condensation, impacting compound structure.
Area of Science:
- Microbiology
- Biochemistry
- Synthetic Biology
Background:
- Streptomyces species are prolific producers of diverse polyketide natural products.
- Polyketide biosynthesis involves complex enzymatic machinery, including ketoreductases.
- Mutational analysis is a key approach to understanding biosynthetic pathways.
Purpose of the Study:
- To characterize compounds produced by Streptomyces mutants lacking polyketide ketoreductase activity.
- To elucidate the role of ketoreductase in the biosynthesis of aromatic polyketides.
Main Methods:
- Generation and cultivation of Streptomyces mutants HO61 and P67 deficient in polyketide ketoreductase.
- Chemical structure elucidation of compounds produced by these mutants.
- Comparative analysis of wild-type and mutant compound profiles.
Main Results:
- Novel compounds were identified from the deficient mutants.
- The structures revealed defects in polyketide chain condensation.
- Ketoreductase activity was confirmed as essential for specific condensation steps.
Conclusions:
- Polyketide ketoreductase plays a critical role in the correct condensation of polyketide chains.
- Disruption of ketoreductase function leads to aberrant polyketide structures.
- Understanding these pathways can inform the engineering of novel polyketides.