Abstract
A selectively modified porous metal/carbon nanocomposite was fabricated to enhance the enrichment of low-abundance phosphopeptides from biological samples. The carbon matrix derived from the metal-organic framework provides a suitable pore size to allow the diffusion of peptides, while the deliberately modified metal nanoparticles within the pores enhance their interaction with the phosphopeptides. This nanocomposite shows extremely high enrichment selectivity for phosphopeptides in the MALDI-TOF MS detection, even when the molar ratio of α-casein digests versus bovine serum albumin digests was up to about 1:20,000. By combining such nanocomposite with nano-LC-MS/MS, 4556 unique phosphopeptides were identified with high selectivity (95.2%) from HeLa cell extracts. Furthermore, phosphopeptides from prostate tissue digests were also determined. A total of 277 and 1242 phosphopeptides were identified from normal and tumor tissues of a patient with prostate cancer, respectively. This indicates that phosphorylation and prostate cancer can be related to each other.
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Acknowledgments
The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for the help of mass spectrometry analysis.
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This work was supported by the Natural Science Foundation of Shanghai (19ZR1412000), the Science and Technology Commission of Shanghai Municipality (STCSM, No. 20520712500), and the Fundamental Research Funds for the Central Universities (No. 50321102017022).
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Pu, C., Zhao, H., Gu, Q. et al. Targeted immobilization of titanium (IV) on magnetic mesoporous nanomaterials derived from metal-organic frameworks for high-efficiency phosphopeptide enrichment in biological samples. Microchim Acta 187, 568 (2020). https://doi.org/10.1007/s00604-020-04556-5
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DOI: https://doi.org/10.1007/s00604-020-04556-5