Quantitative Proteomic Analysis of the Human Nucleolus

Area of Science:

• Proteomics
• Cell Biology
• Biochemistry

Background:

• Mass spectrometry (MS)-based quantitative proteomics has advanced significantly, enabling comprehensive proteome analysis.
• Current techniques allow for the identification of protein components, characterization of proteome dimensions (e.g., turnover, PTMs, localization), and dynamic proteome profiling.
• High-throughput quantitative proteomics combined with subcellular fractionation provides insights into organelle-specific regulatory mechanisms.

Purpose of the Study:

• To present a reliable workflow and protocol for MS-based analysis and quantitation of the nucleolar proteome in human cells.
• To detail a specific protocol for isolating and analyzing nucleoli using advanced quantitative proteomics techniques.
• To provide a foundation for understanding nucleolar function through detailed proteomic characterization.

Main Methods:

• Stable Isotope Labeling by Amino acids in Cell culture (SILAC) analysis of human MCF10A-Src-ER cells.
• Isolation of nucleoli from human cells followed by proteomic analysis.
• Utilized a Q-Exactive Plus Orbitrap MS instrument (Thermo Fisher Scientific) for high-resolution mass spectrometry.
• Subsequent data processing using MaxQuant software and customized R scripts for analysis.

Main Results:

• A comprehensive workflow for the quantitative proteomic analysis of the nucleolar proteome was established.
• The protocol enables detailed characterization of proteins within the nucleolus.
• The study provides a basis for evaluating the nucleolar proteome using advanced MS and computational analysis.

Conclusions:

• The presented workflow offers a reliable method for MS-based quantitative proteomics of the nucleolar proteome.
• This approach facilitates in-depth investigation of nucleolar composition and function.
• The protocol is valuable for studying cellular regulatory mechanisms and physiological responses at the organelle level.