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• W4200381718 abstract "ABSTRACT The enzyme BesC from the β - e thynyl-L- s erine biosynthetic pathway in Streptomyces cattleya fragments 4-chloro-L-lysine (produced from L-Lysine by BesD) to ammonia, formaldehyde, and 4-chloro-L-allylglycine and can analogously fragment L-Lys itself. BesC belongs to the emerging family of O 2 -activating non-heme-diiron enzymes with the “heme-oxygenase-like” protein fold (HDOs). Here we show that binding of L-Lys or an analog triggers capture of O 2 by the protein’s diiron(II) cofactor to form a blue µ-peroxodiiron(III) intermediate analogous to those previously characterized in two other HDOs, the olefin-installing fatty acid decarboxylase, UndA, and the guanidino- N -oxygenase domain of SznF. The ∼ 5- and ∼ 30-fold faster decay of the intermediate in reactions with 4-thia-L-Lys and (4 RS )-chloro-DL-lysine than in the reaction with L-Lys itself, and the primary deuterium kinetic isotope effects (D-KIEs) on decay of the intermediate and production of L-allylglycine in the reaction with 4,4,5,5-[ 2 H]-L-Lys, imply that the peroxide intermediate or a successor complex with which it reversibly interconverts initiates the oxidative fragmentation by abstracting hydrogen from C4. Surprisingly, the sluggish substrate L-Lys can dissociate after triggering the intermediate to form, thereby allowing one of the better substrates to bind and react. Observed linkage between Fe(II) and substrate binding suggests that the triggering event involves a previously documented (in SznF) ordering of the dynamic HDO architecture that contributes one of the iron sites, a hypothesis consistent with the observation that the diiron(III) product cluster produced upon decay of the intermediate spontaneously degrades, as it has been shown to do in all other HDOs studied to date." @default.
• W4200381718 created "2021-12-31" @default.
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• W4200381718 date "2021-12-03" @default.
• W4200381718 modified "2023-09-27" @default.
• W4200381718 title "A Substrate-triggered μ-Peroxodiiron(III) Intermediate in the 4-Choro-L-Lysine-Fragmenting Heme-Oxygenase-like Diiron Oxidase (HDO) BesC: Substrate Dissociation from, and C4 Targeting by, the Intermediate" @default.
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• W4200381718 doi "https://doi.org/10.1101/2021.12.02.471016" @default.
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