In vitro reconstitution and crystal structure of p-aminobenzoate N-oxygenase (AurF) involved in aureothin biosynthesis

Seong Choi Yoo, Houjin Zhang, Joseph S. Brunzelle, Satish K. Nair, Huimin Zhao

    Research output: Contribution to journalArticlepeer-review

    91 Scopus citations

    Abstract

    p-aminobenzoate N-oxygenase (AurF) from Streptomyces thioluteus catalyzes the formation of unusual polyketide synthase starter unit p-nitrobenzoic acid (pNBA) from p-aminobenzoic acid (pABA) in the biosynthesis of antibiotic aureothin. AurF is a metalloenzyme, but its native enzymatic activity has not been demonstrated in vitro, and its catalytic mechanism is unclear. In addition, the nature of the cofactor remains a controversy. Here, we report the in vitro reconstitution of the AurF enzyme activity, the crystal structure of AurF in the oxidized state, and the cocrystal structure of AurF with its product pNBA. Our combined biochemical and structural analysis unequivocally indicates that AurF is a non-heme di-iron monooxygenase that catalyzes sequential oxidation of aminoarenes to nitroarenes via hydroxylamine and nitroso intermediates.

    Original languageEnglish (US)
    Pages (from-to)6858-6863
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume105
    Issue number19
    DOIs
    StatePublished - May 13 2008

    Keywords

    • Di-iron enzymes
    • Metalloenzymes
    • N-oxygenation
    • Reaction mechanism

    ASJC Scopus subject areas

    • General

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