Crystallographic and spectroscopic snapshots reveal a dehydrogenase in action

Lu Huo, Ian Davis, Fange Liu, Babak Andi, Shingo Esaki, Hiroaki Iwaki, Yoshie Hasegawa, Allen M. Orville and Aimin Liu ()
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Lu Huo: Georgia State University
Ian Davis: Georgia State University
Fange Liu: Georgia State University
Babak Andi: Photon Sciences Directorate, Brookhaven National Laboratory
Shingo Esaki: Georgia State University
Hiroaki Iwaki: Kansai University, Suita
Yoshie Hasegawa: Kansai University, Suita
Allen M. Orville: Photon Sciences Directorate, Brookhaven National Laboratory
Aimin Liu: Georgia State University

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract Aldehydes are ubiquitous intermediates in metabolic pathways and their innate reactivity can often make them quite unstable. There are several aldehydic intermediates in the metabolic pathway for tryptophan degradation that can decay into neuroactive compounds that have been associated with numerous neurological diseases. An enzyme of this pathway, 2-aminomuconate-6-semialdehyde dehydrogenase, is responsible for ‘disarming’ the final aldehydic intermediate. Here we show the crystal structures of a bacterial analogue enzyme in five catalytically relevant forms: resting state, one binary and two ternary complexes, and a covalent, thioacyl intermediate. We also report the crystal structures of a tetrahedral, thiohemiacetal intermediate, a thioacyl intermediate and an NAD+-bound complex from an active site mutant. These covalent intermediates are characterized by single-crystal and solution-state electronic absorption spectroscopy. The crystal structures reveal that the substrate undergoes an E/Z isomerization at the enzyme active site before an sp3-to-sp2 transition during enzyme-mediated oxidation.

Date: 2015
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DOI: 10.1038/ncomms6935

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