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Rapid identification of magnesium ascorbyl phosphate utilizing phosphatase through a chromogenic change-coupled activity assay

  • Applied microbial and cell physiology
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Abstract

In this study, we report a chromogenic reaction between magnesium ascorbyl phosphate (MAP) and ferric chloride to generate a Brown-Red clathrate, while the Treated MAP by phosphatases forms Colorless (BRTC) product with ferric chloride. The BRTC was indicative of phosphatase activity-mediated excision of phosphorous group from MAP and utilized to screen phosphatases from bacterial cell lysates. From ten tested strains, BRTC was observed in the cell lysate of Salmonella enterica subsp. enterica serovar Cerro 87. BRTC was again employed to track phosphatase activity of the resuspensions of the ammonium sulfate graded precipitations of the cell lysate. Two phosphatases, PhoN and YcdX, were identified by LC-MS/MS analysis in the protein fraction giving most obvious BRTC phenotype and validated by examination of in vitro activity of the purified proteins.

Key points

BRTC is labelling-free, naked-eye visible, and independent of any facilities.

BRTC can directly screen phosphatases from microbial cell lysates.

Using BRTC system, two phosphatases were identified in Salmonella enterica subsp. enterica serovar Cerro 87.

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The data supporting the findings of this study are available within the article and its supplementary information files.

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Funding

This work was supported by grant from the National Key Research and Development Program of China (grant number 2020YFA0907200) and the National Natural Science Foundation of China (grant numbers 31871250, 31670034).

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Contributions

YW, WH, and XH conceived and designed research. ZD and XH supervised the project. YW conducted experiments. YW and WH analyzed data. YW and XH wrote the manuscript. All authors read and approved the manuscript.

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Correspondence to Xinyi He.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare no competing interests.

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Wang, Y., Hu, W., Deng, Z. et al. Rapid identification of magnesium ascorbyl phosphate utilizing phosphatase through a chromogenic change-coupled activity assay. Appl Microbiol Biotechnol 105, 2901–2909 (2021). https://doi.org/10.1007/s00253-021-11229-7

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  • DOI: https://doi.org/10.1007/s00253-021-11229-7

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