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Crystal structure of hypothetical protein PA4202 from Pseudomonas aeruginosa PAO1 in complex with nitroethane as a nitroalkane substrate

Authors
Kim, Do WanLee, Ki SeogChi, Young Min
Issue Date
3-9월-2018
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords
Nitronate monooxygenase; Nitroalkane oxidase; Flavoenzyme; Nitroalkane; Pseudomonas aeruginosa
Citation
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, v.503, no.1, pp.330 - 337
Indexed
SCIE
SCOPUS
Journal Title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume
503
Number
1
Start Page
330
End Page
337
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/73143
DOI
10.1016/j.bbrc.2018.06.024
ISSN
0006-291X
Abstract
Nitroalkane oxidase (NAO) and nitronate monooxygenase (NMO) are two different types of nitroalkane oxidizing flavoenzymes identified in nature. A previous study suggested that the hypothetical protein PA4202 from Pseudomonas aeruginosa PAO1 is NMO and utilizes only anionic nitronates. However, the structural similarity between the PA4202 protein and Streptomyces ansochromogenes NAO has motivated investigation for what features of the two enzymes differentiate between the NAO and NMO activities. Herein, we report the crystal structure of PA4202 in a ternary complex with a neutral nitroethane (NE) and flavin mononucleotide (FMN) cofactor to elucidate the substrate recognition mechanism using a site-directed mutagenesis. The ternary complex structure indicates that the NE is bound with an orientation, which is poised for the proton transfer to H183 (which is the essential first catalytic step with nitroalkanes), and subsequent reactions with FMN. Moreover, a kinetic study reveals that the catalytic reactions of the wild type and H183 mutants PA4202s with nitroalkane substrates may yield the products of hydrogen peroxide and nitrite that are specified to NAO, although they show a low catalytic efficiency. Our results provide the first structure-based molecular insight into the substrate binding property of the hypothetical protein PA4202, including the interactions with neutral nitroalkanes as the substrate. (C) 2018 Elsevier Inc. All rights reserved.
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생명과학대학 (생명공학부)
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