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Identification and quantification of mycothiol in Actinobacteria by a novel enzymatic method

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Abstract

Mycothiol (MSH) was reported to be the dominant low molecular weight thiol in members of the Actinobacteria. In this study, a simple, fast, and sensitive method for qualitative and quantitative determination of MSH molecules was developed based on maleylpyruvate isomerase (MPI) from Corynebacterium glutamicum. The principle of this method is that the activity of MPI from C. glutamicum was dependent on MSH molecules. It was found that this MPI activity displayed a linear response (R 2 = 0.9928) at MSH amounts ranging from 0.12 to 3.98 pmol in the defined assay system. This observation was applied to calculate the MSH levels, and the newly developed method was compared with thiol-specific fluorescent-labeling high-performance liquid chromatography method. Forty-eight genera of Actinobacteria were screened for MSH and 43 genera were reported for MSH occurrence, and the MSH levels in Actinobacteria were determined to be 0.01 to 9.69 μmol/g of residual dry cell weight.

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Acknowledgements

This work is supported by grants from the National Natural Science Foundation of China (30725001). Technical support from Prof. Y-S. Che’s laboratory at the IMCAS (Beijing) and assistance in MSH purification by Ms. Ying Lao are greatly acknowledged.

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Correspondence to Shuang-Jiang Liu.

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Yin, YJ., Wang, BJ., Jiang, CY. et al. Identification and quantification of mycothiol in Actinobacteria by a novel enzymatic method. Appl Microbiol Biotechnol 88, 1393–1401 (2010). https://doi.org/10.1007/s00253-010-2918-3

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  • DOI: https://doi.org/10.1007/s00253-010-2918-3

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