Abstract
Identification of human plasma proteins with deep coverage is considered as a great challenge due to its extreme complexity. In this work, an intact proteins fractionation strategy based on multi-interaction between proteins and GO/PEI/Au/PEG nanocomposites (GPAP strategy) was developed for human plasma proteome deep analysis. Compared with untreated method, the number of identified proteins was increased from 858 to 2023, among which the number of low-abundance proteins (< 100ng/mL) was increased from 2 to 11. The concentration range of the identified proteins was broaden to 9 orders of magnitude. Furthermore, the spectral count of the top three proteins in human plasma (Plasma Albumin, Human IgG, Serotransferrin) were decreased in the range of 37.4–82.6%. An excellent reproducibility of GPAP strategy was verified via stable isotope dimethyl label strategy. The functionalized material was demonstrated to be an efficient method to achieve deep coverage identification of human plasma proteome.
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