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Characterization and Crystal Structure of a Nonheme Diiron Monooxygenase Involved in Platensimycin and Platencin Biosynthesis
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    Characterization and Crystal Structure of a Nonheme Diiron Monooxygenase Involved in Platensimycin and Platencin Biosynthesis
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    • Liao-Bin Dong
      Liao-Bin Dong
      Department of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United States
    • Yu-Chen Liu
      Yu-Chen Liu
      Department of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United States
      More by Yu-Chen Liu
    • Alexis J. Cepeda
      Alexis J. Cepeda
      Department of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United States
    • Edward Kalkreuter
      Edward Kalkreuter
      Department of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United States
    • Ming-Rong Deng
      Ming-Rong Deng
      Department of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United States
    • Jeffrey D. Rudolf
      Jeffrey D. Rudolf
      Department of Chemistry, and The Scripps Research Institute, Jupiter, Florida 33458, United States
    • Changsoo Chang
      Changsoo Chang
      Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
    • Andrzej Joachimiak
      Andrzej Joachimiak
      Midwest Center for Structural Genomics and Structural Biology Center, Biosciences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
    • George N. Phillips Jr.
      George N. Phillips, Jr.
      Department of Biosciences, Rice University, Houston, Texas 77030, United States
    • Ben Shen*
      Ben Shen
      Department of Chemistry,  Department of Molecular Medicine  and  Natural Products Library Initiative, and The Scripps Research Institute, Jupiter, Florida 33458, United States
      *[email protected]
      More by Ben Shen
    Other Access OptionsSupporting Information (1)

    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2019, 141, 31, 12406–12412
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    https://doi.org/10.1021/jacs.9b06183
    Published July 10, 2019
    Copyright © 2019 American Chemical Society

    Abstract

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    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.

    Copyright © 2019 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/jacs.9b06183.

    • Materials; methods; detailed experimental procedures; bioinformatic analysis; in vivo, in vitro, and structural characterizations of PtmU3; and structural elucidation of 8 and 12 (PDF)

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    This article is cited by 25 publications.

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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2019, 141, 31, 12406–12412
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jacs.9b06183
    Published July 10, 2019
    Copyright © 2019 American Chemical Society

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