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Related Concept Videos

Peptide Identification Using Tandem Mass Spectrometry01:33

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
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Multi-Protease Strategy Identifies Three PE2 Missing Proteins in Human Testis Tissue.

Yihao Wang1,2, Yang Chen1, Yao Zhang3

  • 1State Key Laboratory of Proteomics, National Center for Protein Sciences Beijing, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine , Beijing 102206, China.

Journal of Proteome Research
|September 30, 2017
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Summary

Researchers identified novel testis-enriched missing proteins (MPs) using a multiprotease strategy. Three exemplary MPs were validated under exceptional criteria, advancing the Chromosome-Centric Human Proteome Project (C-HPP) mission.

Keywords:
Chromosome-Centric Human Proteome Projectmissing proteinsmultiproteaseproteometestis

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Area of Science:

  • Proteomics
  • Human Proteome Project
  • Mass Spectrometry

Background:

  • The Chromosome-Centric Human Proteome Project (C-HPP) aims to identify all human proteins, with a focus on missing proteins (MPs).
  • Previous strategies relied on standard proteases like trypsin, potentially limiting peptide diversity and coverage.
  • Testis-specific MPs are a particular focus for the C-HPP's next-50-MPs challenge.

Purpose of the Study:

  • To identify novel testis-enriched missing proteins (MPs) using an optimized proteomic strategy.
  • To evaluate the efficacy of nonconventional proteases in improving peptide identification for MPs.
  • To validate identified MPs according to the Human Proteome Project (HPP) guidelines.

Main Methods:

  • Theoretical analysis of MPs using multiprotease digestion (including LysargiNase and GluC) to enhance peptide diversity.
  • Separation of human testis tissues by 10% SDS-PAGE followed by high-resolution LC-MS/MS analysis (Q Exactive HF).
  • Rigorous data analysis including spectrum quality checks, isobaric post-translational modification (PTM) and single amino acid variant (SAAV) filtering, and synthesized peptide verification.

Main Results:

  • A total of 7838 proteins were identified in the human testis proteome.
  • Three PE2-level missing proteins (beta-defensin 123, cancer/testis antigen family 45 member A10, and Histone H2A-Bbd type 2/3) were identified.
  • Two of these MPs (beta-defensin 123 and Histone H2A-Bbd type 2/3) met exceptional criteria for identification based on unique peptide evidence and overlapping peptides from different proteases.

Conclusions:

  • A multiprotease digestion strategy significantly improves the identification of testis-enriched missing proteins compared to conventional methods.
  • Nonconventional proteases like LysargiNase and GluC are valuable tools for increasing peptide diversity and sequence coverage in proteomic studies.
  • The identified MPs, validated under exceptional criteria, represent significant progress in the C-HPP's mission to complete the human proteome.