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Thermostable and highly specific l-aspartate oxidase from Thermococcus litoralis DSM 5473: cloning, overexpression, and enzymological properties

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Abstract

We successfully expressed the l-aspartate oxidase homolog gene (accession no: OCC_06611) of Thermococcus litoralis DSM 5473 in the soluble fraction of Escherichia coli BL21 (DE3) using a pET21b vector with 6X His tag at its C-terminus. The gene product (Tl-LASPO) showed l-aspartate oxidase activity in the presence of FAD in vitro, and this report is the first that details an l-aspartate oxidase derived from a Thermococcus species. The homologs of Tl-LASPO existed mainly in archaea, especially in the genus of Thermococcus, Pyrococcus, Sulfolobus, and Halobacteria. The quaternary structure of Tl-LASPO was homotrimeric with a subunit molecular mass of 52 kDa. The enzyme activity of Tl-LASPO increased with temperature up to 70 °C. Tl-LASPO was active from pH 6.0 to 9.0, and its highest activity was at pH 8.0. Tl-LASPO was stable at 80 °C for 1 h. The highest k cat/K m value was observed in assays at 70 °C. Tl-LASPO was highly specific for l-aspartic acid. Tl-LASPO utilized fumaric acid, 2,6-dichlorophenolindophenol, and ferricyanide in addition to FAD as a cofactor under anaerobic conditions. The absorption spectrum of holo-Tl-LASPO exhibited maxima at 380 and 450 nm. The FAD dissociation constant, K d, of the FAD-Tl-LASPO complex was determined to be 5.9 × 10−9 M.

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Abbreviations

DCIP:

2,6-Dichlorophenolindophenol

DTT:

Dithiothreitol

DTNB:

Dithiobis-(2-nitrobenzoic acid)

EDTA:

Ethylenediaminetetraacetic acid

FAD:

Flavin adenine dinucleotide

KPB:

Potassium phosphate buffer

LB:

Luria–Bertani

MALDI-TOF-MS:

Matrix-assisted laser desorption–ionization mass spectrometry

NAD:

Nicotine adenine dinucleotide

PLP:

Pyridoxal 5′-phosphate

PCR:

Polymerase chain reaction

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Acknowledgements

This study was supported in part by the Ministry of Education, Culture, Sports, Science and Technology (MEXT)—Supported Program for the Strategic Research Foundation at Private Universities (Project no. S1311044), 2013–2017.

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Correspondence to Tadao Oikawa.

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Communicated by H. Atomi.

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Washio, T., Oikawa, T. Thermostable and highly specific l-aspartate oxidase from Thermococcus litoralis DSM 5473: cloning, overexpression, and enzymological properties. Extremophiles 22, 59–71 (2018). https://doi.org/10.1007/s00792-017-0977-4

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  • DOI: https://doi.org/10.1007/s00792-017-0977-4

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