Bioinformatic Discovery of a Cambialistic Monooxygenase

Dinuclear monooxygenases mediate challenging C–H bond oxidation reactions throughout nature. Many of these enzymes are presumed to exclusively utilize diiron cofactors. Herein we report the bioinformatic discovery of an orphan dinuclear monooxygenase that preferentially utilizes a heterobimetallic manganese–iron (Mn/Fe) cofactor to mediate an O₂-dependent C–H bond hydroxylation reaction. Unlike the structurally similar Mn/Fe-dependent monooxygenase AibH2, the diiron form of this enzyme (SfbO) exhibits a nascent enzymatic activity. This behavior raises the possibility that many other dinuclear monooxygenases may be endowed with the capacity to harness cofactors with a variable metal content.. Authors: Liu, Chang [Univ. of California, Berkeley, CA (United States)] (ORCID:000000029393101X); Powell, Magan M. [Univ. of California, Berkeley, CA (United States)]; Rao, Guodong [Univ. of California, Berkeley, CA (United States)]; Britt, R. David [Univ. of California, Berkeley, CA (United States)] (ORCID:0000000308898436); Rittle, Jonathan [Univ. of California, Berkeley, CA (United States)] (ORCID:0000000162416253). DOE Contract: AC02-05CH11231; AC02-76SF00515. Subjects: 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Assays; Electron paramagnetic resonance spectroscopy; Peptides and proteins; Redox reactions; Transition metals