Deciphering the late steps of rifamycin biosynthesis
Feifei Qi1, Chao Lei2, Fengwei Li1
1Shandong Provincial Key Laboratory of Synthetic Biology, CAS Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong, 266101, China.
Nature Communications
|June 16, 2018
Summary
Researchers elucidated key enzymatic steps in rifamycin biosynthesis. The study identified Rif15 and Rif16 enzymes, revealing novel C-O bond formation and ester-to-ether transformations in producing these vital antibiotic precursors.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Rifamycin-derived drugs are crucial for treating tuberculosis and other infections.
- The late-stage biosynthesis pathways for industrially significant rifamycins (SV and B) are not well understood.
Purpose of the Study:
- To characterize the enzymatic network responsible for the biosynthesis of rifamycin SV, S, L, O, and B.
- To elucidate the specific roles of key enzymes in these pathways.
Main Methods:
- Biochemical assays to characterize enzyme activity.
- Enzyme kinetics studies.
- Structural analysis of enzyme-substrate interactions (implied).
Main Results:
- Identified a two-subunit transketolase, Rif15, mediating a unique C-O bond formation in rifamycin L biosynthesis.
- Characterized a cytochrome P450 enzyme, Rif16, responsible for an atypical ester-to-ether transformation from rifamycin L to rifamycin B.
- Demonstrated novel catalytic mechanisms within these enzyme families.
Conclusions:
- The study reveals previously unknown enzymatic steps in rifamycin biosynthesis.
- Rif15 and Rif16 enzymes play critical roles in generating diverse rifamycin compounds.
- These findings offer insights into the biosynthesis of essential antibiotics and highlight novel enzyme chemistries.
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