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Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Related Experiment Video

Updated: Jun 28, 2025

Comprehensive Workflow of Mass Spectrometry-based Shotgun Proteomics of Tissue Samples
14:51

Comprehensive Workflow of Mass Spectrometry-based Shotgun Proteomics of Tissue Samples

Published on: November 13, 2021

5.3K

Optimized Workflow for Proteomics and Phosphoproteomics With Limited Tissue Samples.

Minghan Hu1, Yan Wang2

  • 1Functional Genomics Section and Cell Biology Section, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland.

Current Protocols
|April 22, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new seven-step workflow for proteomics and phosphoproteomics on small samples, like neuronal tissues. It uses a dual enrichment strategy for phosphopeptides, improving recovery from limited protein amounts.

Keywords:
limited proteinphosphoprotein enrichmentphosphoproteomicsproteomicstrigeminal ganglion

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Last Updated: Jun 28, 2025

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Proteomics

Background:

  • Proteomics and phosphoproteomics are vital for understanding post-transcriptional regulation.
  • Analyzing small biological samples, especially neuronal tissues, presents challenges in peptide and phosphopeptide recovery.
  • Existing workflows may not be optimized for limited sample sizes, impacting data quality.

Purpose of the Study:

  • To develop and present a comprehensive 7-step experimental workflow for proteomic and phosphoproteomic analysis of small-scale samples.
  • To optimize peptide and phosphopeptide recovery from limited biological material, with a focus on neuronal tissues.
  • To establish a robust method overcoming sample limitations in high-precision proteomic investigations.

Main Methods:

  • A novel 7-step workflow for sample preparation was designed.
  • A dual phosphopeptide enrichment strategy using Immobilized Metal Affinity Chromatography (IMAC) Fe-NTA magnetic beads and Titanium Dioxide (TiO2) was implemented.
  • Standard proteomic techniques including protein extraction, digestion, TMT labeling, peptide cleanup, high pH fractionation, and LC-MS/MS analysis were employed.

Main Results:

  • The workflow successfully addresses the challenge of limited protein and phosphopeptide recovery from small samples.
  • The dual enrichment strategy enhances the breadth and efficiency of phosphopeptide capture.
  • The method provides a new benchmark for precision and efficiency in analyzing limited biological samples.

Conclusions:

  • The developed workflow significantly improves proteomic and phosphoproteomic analysis for small-scale samples.
  • This method is particularly beneficial for analyzing precious neuronal tissues like the trigeminal ganglion.
  • The optimized protocol enhances the recovery and precision of proteomic investigations from limited biological starting material.