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A novel protocol for enzymatic digestion based on covalent binding by protein immobilization

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Abstract

The process of protein digestion is a critical step for successful protein identification in proteomic analysis. Many efforts have been dedicated to enhancing the digestion efficiency for sufficient digestion. Among these approaches, protein complete denaturation with denaturants is a common process for better digestion. However, the removal of denaturants was tedious or would cause protein loss and other problems. In this work, a feasible digestion approach, immobilized protein digestion (IPD), based on covalent binding has been developed. Proteins can be completely denatured and immobilized on the surface of functional materials by covalent binding to form a monolayer. Subsequently, varieties of denaturants or contaminants would be removed thoroughly by washing. To achieve fast immobilization and high digestion efficiency, different functional materials and denaturants were selected. Compared with traditional in-solution digestion, the method achieved a prominent increase in identified peptides numbers and sequence coverage of proteins. Data analysis also showed that covalent binding could evidently decrease enzymatic missed cleavage for various protein sequences. Furthermore, possible peptide losses due to covalent binding were also investigated. Also, it has been proved to be efficient for complex biological sample digestion.

Workflow of the IPD method, including protein denaturation, immobilization, digestion, and identification

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Acknowledgments

This work was supported by the National Research Projects (2016YFA0501402, 2012YQ12004409, and 2013CB911201).

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Correspondence to Xiangmin Zhang.

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The use of the mouse liver samples for research was approved by the Ethics Committee of Zhongshan Hospital and the Biomedical Sciences, Fudan University. All authors declare that they are in compliance with the ethical standards.

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Qi, Q., Yan, G., Deng, C. et al. A novel protocol for enzymatic digestion based on covalent binding by protein immobilization. Anal Bioanal Chem 408, 8437–8445 (2016). https://doi.org/10.1007/s00216-016-9964-3

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  • DOI: https://doi.org/10.1007/s00216-016-9964-3

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