Characterization and Crystal Structure of a Nonheme Diiron Monooxygenase Involved in Platensimycin and Platencin BiosynthesisClick to copy article linkArticle link copied!
- Liao-Bin DongLiao-Bin DongDepartment of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Liao-Bin Dong
- Yu-Chen LiuYu-Chen LiuDepartment of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Yu-Chen Liu
- Alexis J. CepedaAlexis J. CepedaDepartment of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Alexis J. Cepeda
- Edward KalkreuterEdward KalkreuterDepartment of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Edward Kalkreuter
- Ming-Rong DengMing-Rong DengDepartment of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Ming-Rong Deng
- Jeffrey D. RudolfJeffrey D. RudolfDepartment of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Jeffrey D. Rudolf
- Changsoo ChangChangsoo ChangMidwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, Argonne, Illinois 60439, United StatesMore by Changsoo Chang
- Andrzej JoachimiakAndrzej JoachimiakMidwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, Argonne, Illinois 60439, United StatesMore by Andrzej Joachimiak
- George N. Phillips Jr.George N. Phillips, Jr.Department of Biosciences, Rice University, Houston, Texas 77030, United StatesMore by George N. Phillips, Jr.
- Ben Shen*Ben Shen*[email protected]Department of Chemistry, Department of Molecular Medicine and Natural Products Library Initiative, and The Scripps Research Institute, Jupiter, Florida 33458, United StatesMore by Ben Shen
Abstract

Nonheme diiron monooxygenases make up a rapidly growing family of oxygenases that are rarely identified in secondary metabolism. Herein, we report the in vivo, in vitro, and structural characterizations of a nonheme diiron monooxygenase, PtmU3, that installs a C-5 β-hydroxyl group in the unified biosynthesis of platensimycin and platencin, two highly functionalized diterpenoids that act as potent and selective inhibitors of bacterial and mammalian fatty acid synthases. This hydroxylation sets the stage for the subsequent A-ring cleavage step key to the unique diterpene-derived scaffolds of platensimycin and platencin. PtmU3 adopts an unprecedented triosephosphate isomerase (TIM) barrel structural fold for this class of enzymes and possesses a noncanonical diiron active site architecture with a saturated six-coordinate iron center lacking a μ-oxo bridge. This study reveals the first member of a previously unidentified superfamily of TIM-barrel-fold enzymes for metal-dependent dioxygen activation, with the majority predicted to act on CoA-linked substrates, thus expanding our knowledge of nature’s repertoire of nonheme diiron monooxygenases and TIM-barrel-fold enzymes.
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