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Characterization of a Phosphatidylserine Synthase of Vibrio parahaemolyticus

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Abstract

Phosphatidylserine synthase (Pss) is involved in the metabolic pathway in phospholipid synthesis in different organisms. In this study, Pss expression in Vibrio parahaemolyticus was verified through liquid chromatography tandem-mass spectrometry. To analyze the characteristics of Pss, the recombinant Pss was overexpressed and purified from Escherichia coli. The optimum temperature and pH of Pss were 40 °C and 8, respectively. When reacting with divalent metal, Pss activity decreased. In addition, Pss could not only use cytidine diphosphate diacylglycerol (CDP-DAG, 16:0), but also CDP-DAG (18:1) as a substrate to produce cytidine 5′‐monophosphate. Furthermore, the 3D structure of Pss was predicted, and the results revealed that histidine and lysine of the two HKD motifs were present in the catalytic site. Moreover, CDP-DAG (16:0) was docked with the Pss model. To investigate whether the two HKD motifs in Pss are important to its activity, site-directed mutagenesis of histidine was performed. The results revealed that the activities of both H131A and H352A were diminished. Little is known regarding the catalytic site of type I Pss. This is the first report on the biochemical characterization of Pss in V. parahaemolyticus.

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Acknowledgement

This work was supported by the Ministry of Science and Technology of Taiwan (Grant No. MOST 106–2313-B-002–024).

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  1. Microbiology Laboratory, Department of Agricultural Chemistry, National Taiwan University, 1 Sec 4, Roosevelt Road, Taipei, 10617, Taiwan

    Ru-Yin Huang & Chia-Yin Lee

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  1. Ru-Yin Huang
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Correspondence to Chia-Yin Lee.

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Huang, RY., Lee, CY. Characterization of a Phosphatidylserine Synthase of Vibrio parahaemolyticus. Curr Microbiol 77, 710–715 (2020). https://doi.org/10.1007/s00284-019-01854-x

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  • DOI: https://doi.org/10.1007/s00284-019-01854-x

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