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Assignment of the vibrational spectra of enzyme-bound tryptophan tryptophyl quinones using a combined QM/MM approach

Assignment of the vibrational spectra of enzyme-bound tryptophan tryptophyl quinones using a combined QM/MM approach

Pang, Jiayun, Scrutton, Nigel S., de Visser, Sam P. and Sutcliffe, Michael J. (2009) Assignment of the vibrational spectra of enzyme-bound tryptophan tryptophyl quinones using a combined QM/MM approach. The Journal of Physical Chemistry A, 114 (2). pp. 1212-1217. ISSN 1089-5639 (Print), 1520-5215 (Online) (doi:10.1021/jp910161k)

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Abstract

Fourier transform infrared (FTIR) spectroscopy can be used to provide a detailed time-resolved probe of reaction intermediates in enzyme-catalyzed systems. Accurate assignment of the respective chemical species being studied is key to the success of this approach. The plethora of signals from the protein environment, leading to complexity in the spectra, presents a particular challenge. Here we present a combined QM/MM-based approach that can be used to assign key resonances in the FTIR spectrum of tryptophan tryptophyl quinone (TTQ) in the TTQ-dependent quinoprotein aromatic amine dehydrogenase (AADH). We show that consideration of the cofactor alone is not sufficient to identify correctly the experimentally observed resonances—inclusion of the protein is required for this. However, to enable accurate peak assignment, a stepwise approach is needed that builds up increasing levels of complexity from a simple system. This study serves as a benchmark for future QM/MM-based studies to predict the spectroscopic changes during the interconversion of intermediates in the reductive half-reaction catalyzed by AADH, and more generally for using a combined QM/MM approach to calculate spectroscopic data of protein cofactors and cofactor-based adducts. Copyright © 2009 American Chemical Society.

Item Type: Article
Uncontrolled Keywords: Fourier transform infrared (FTIR) spectroscopy, enzymes
Subjects: Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 17 Oct 2016 09:12
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/9554

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