Evidence for a ferryl intermediate in a heme-based dioxygenase
In contrast to the wide spectrum of cytochrome P450 monooxygenases, there are only 2 heme-based dioxygenases in humans: tryptophan dioxygenase (hTDO) and indoleamine 2,3-dioxygenase (hIDO). hTDO and hIDO catalyze the same oxidative ring cleavage reaction of L-tryptophan to N-formyl kynurenine, the i...
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paper:paper_00278424_v106_n41_p17371_LewisBallester2023-06-08T14:54:23Z Evidence for a ferryl intermediate in a heme-based dioxygenase Martí, Marcelo Adrián Capece, Luciana Estrin, Dario Ariel Indoleamine 2,3-dioxygenase Reasonance raman spectroscopy Tryptophan dioxygenase indoleamine 2,3 dioxygenase oxygen tryptophan 2,3 dioxygenase article atom controlled study enzyme chemistry enzyme conformation enzyme mechanism enzyme regulation enzyme structure kinetics priority journal Raman spectrometry Computer Simulation Crystallography, X-Ray Dioxygenases Humans Indoleamine-Pyrrole 2,3,-Dioxygenase Kinetics Kynurenine Spectrum Analysis, Raman Tryptophan In contrast to the wide spectrum of cytochrome P450 monooxygenases, there are only 2 heme-based dioxygenases in humans: tryptophan dioxygenase (hTDO) and indoleamine 2,3-dioxygenase (hIDO). hTDO and hIDO catalyze the same oxidative ring cleavage reaction of L-tryptophan to N-formyl kynurenine, the initial and rate-limiting step of the kynurenine pathway. Despite immense interest, the mechanism by which the 2 enzymes execute the dioxygenase reaction remains elusive. Here, we report experimental evidence for a key ferryl intermediate of hIDO that supports a mechanism in which the 2 atoms of dioxygen are inserted into the substrate via a consecutive 2-step reaction. This finding introduces a paradigm shift in our understanding of the heme-based dioxygenase chemistry, which was previously believed to proceed via simultaneous incorporation of both atoms of dioxygen into the substrate. The ferryl intermediate is not observable during the hTDO reaction, highlighting the structural differences between the 2 dioxygenases, as well as the importance of stereoelectronic factors in modulating the reactions. Fil:Marti, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Capece, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Estrin, D.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00278424_v106_n41_p17371_LewisBallester http://hdl.handle.net/20.500.12110/paper_00278424_v106_n41_p17371_LewisBallester |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Indoleamine 2,3-dioxygenase Reasonance raman spectroscopy Tryptophan dioxygenase indoleamine 2,3 dioxygenase oxygen tryptophan 2,3 dioxygenase article atom controlled study enzyme chemistry enzyme conformation enzyme mechanism enzyme regulation enzyme structure kinetics priority journal Raman spectrometry Computer Simulation Crystallography, X-Ray Dioxygenases Humans Indoleamine-Pyrrole 2,3,-Dioxygenase Kinetics Kynurenine Spectrum Analysis, Raman Tryptophan |
spellingShingle |
Indoleamine 2,3-dioxygenase Reasonance raman spectroscopy Tryptophan dioxygenase indoleamine 2,3 dioxygenase oxygen tryptophan 2,3 dioxygenase article atom controlled study enzyme chemistry enzyme conformation enzyme mechanism enzyme regulation enzyme structure kinetics priority journal Raman spectrometry Computer Simulation Crystallography, X-Ray Dioxygenases Humans Indoleamine-Pyrrole 2,3,-Dioxygenase Kinetics Kynurenine Spectrum Analysis, Raman Tryptophan Martí, Marcelo Adrián Capece, Luciana Estrin, Dario Ariel Evidence for a ferryl intermediate in a heme-based dioxygenase |
topic_facet |
Indoleamine 2,3-dioxygenase Reasonance raman spectroscopy Tryptophan dioxygenase indoleamine 2,3 dioxygenase oxygen tryptophan 2,3 dioxygenase article atom controlled study enzyme chemistry enzyme conformation enzyme mechanism enzyme regulation enzyme structure kinetics priority journal Raman spectrometry Computer Simulation Crystallography, X-Ray Dioxygenases Humans Indoleamine-Pyrrole 2,3,-Dioxygenase Kinetics Kynurenine Spectrum Analysis, Raman Tryptophan |
description |
In contrast to the wide spectrum of cytochrome P450 monooxygenases, there are only 2 heme-based dioxygenases in humans: tryptophan dioxygenase (hTDO) and indoleamine 2,3-dioxygenase (hIDO). hTDO and hIDO catalyze the same oxidative ring cleavage reaction of L-tryptophan to N-formyl kynurenine, the initial and rate-limiting step of the kynurenine pathway. Despite immense interest, the mechanism by which the 2 enzymes execute the dioxygenase reaction remains elusive. Here, we report experimental evidence for a key ferryl intermediate of hIDO that supports a mechanism in which the 2 atoms of dioxygen are inserted into the substrate via a consecutive 2-step reaction. This finding introduces a paradigm shift in our understanding of the heme-based dioxygenase chemistry, which was previously believed to proceed via simultaneous incorporation of both atoms of dioxygen into the substrate. The ferryl intermediate is not observable during the hTDO reaction, highlighting the structural differences between the 2 dioxygenases, as well as the importance of stereoelectronic factors in modulating the reactions. |
author |
Martí, Marcelo Adrián Capece, Luciana Estrin, Dario Ariel |
author_facet |
Martí, Marcelo Adrián Capece, Luciana Estrin, Dario Ariel |
author_sort |
Martí, Marcelo Adrián |
title |
Evidence for a ferryl intermediate in a heme-based dioxygenase |
title_short |
Evidence for a ferryl intermediate in a heme-based dioxygenase |
title_full |
Evidence for a ferryl intermediate in a heme-based dioxygenase |
title_fullStr |
Evidence for a ferryl intermediate in a heme-based dioxygenase |
title_full_unstemmed |
Evidence for a ferryl intermediate in a heme-based dioxygenase |
title_sort |
evidence for a ferryl intermediate in a heme-based dioxygenase |
publishDate |
2009 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00278424_v106_n41_p17371_LewisBallester http://hdl.handle.net/20.500.12110/paper_00278424_v106_n41_p17371_LewisBallester |
work_keys_str_mv |
AT martimarceloadrian evidenceforaferrylintermediateinahemebaseddioxygenase AT capeceluciana evidenceforaferrylintermediateinahemebaseddioxygenase AT estrindarioariel evidenceforaferrylintermediateinahemebaseddioxygenase |
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1768546242688712704 |