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Molecules 2017, 22(12), 2272; https://doi.org/10.3390/molecules22122272

Activation of Recombinantly Expressed l-Amino Acid Oxidase from Rhizoctonia solani by Sodium Dodecyl Sulfate

1
Biochemistry III, Department of Chemistry, Universitätsstrasse 25, Bielefeld University, 33615 Bielefeld, Germany
2
Physical and Biophysical Chemistry, Department of Chemistry, Universitätsstrasse 25, Bielefeld University, 33615 Bielefeld, Germany
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 15 December 2017 / Accepted: 18 December 2017 / Published: 20 December 2017
(This article belongs to the Special Issue Flavoenzymes)
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Abstract

l-Amino acid oxidases (l-AAO) catalyze the oxidative deamination of l-amino acids to the corresponding α-keto acids. The non-covalently bound cofactor FAD is reoxidized by oxygen under formation of hydrogen peroxide. We expressed an active l-AAO from the fungus Rhizoctonia solani as a fusion protein in E. coli. Treatment with small amounts of the detergent sodium dodecyl sulfate (SDS) stimulated the activity of the enzyme strongly. Here, we investigated whether other detergents and amphiphilic molecules activate 9His-rsLAAO1. We found that 9His-rsLAAO1 was also activated by sodium tetradecyl sulfate. Other detergents and fatty acids were not effective. Moreover, effects of SDS on the oligomerization state and the protein structure were analyzed. Native and SDS-activated 9His-rsLAAO1 behaved as dimers by size-exclusion chromatography. SDS treatment induced an increase in hydrodynamic radius as observed by size-exclusion chromatography and dynamic light scattering. The activated enzyme showed accelerated thermal inactivation and an exposure of additional protease sites. Changes in tryptophan fluorescence point to a more hydrophilic environment. Moreover, FAD fluorescence increased and a lower concentration of sulfites was sufficient to form adducts with FAD. Taken together, these data point towards a more open conformation of SDS-activated l-amino acid oxidase facilitating access to the active site. View Full-Text
Keywords: l-amino acid oxidase; activation; SDS; active conformation; conformational change; photon correlation spectroscopy (PCS) l-amino acid oxidase; activation; SDS; active conformation; conformational change; photon correlation spectroscopy (PCS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hahn, K.; Hertle, Y.; Bloess, S.; Kottke, T.; Hellweg, T.; Fischer von Mollard, G. Activation of Recombinantly Expressed l-Amino Acid Oxidase from Rhizoctonia solani by Sodium Dodecyl Sulfate. Molecules 2017, 22, 2272.

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