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Related Experiment Video

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Low Molecular Weight Protein Enrichment on Mesoporous Silica Thin Films for Biomarker Discovery
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Alternative Strategy To Explore Missing Proteins with Low Molecular Weight.

Zhilong Lin1,2, Yuanliang Zhang1,2, Huozhen Pan1,2

  • 1BGI-Shenzhen , Beishan Industrial Zone 11th building , Yantian District, Shenzhen , Guangdong 518083 , China.

Journal of Proteome Research
|October 9, 2019
PubMed
Summary

Researchers developed a new strategy to identify low-molecular-weight missing proteins (MPs) in human placenta. This approach successfully identified three novel MPs, advancing the Human Proteome Project

Keywords:
C18 SPE columnLC-MS/MSlow molecular weight proteinsmissing proteinsplacenta

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Area of Science:

  • Proteomics
  • Human Proteome Project (HPP)
  • Low-molecular-weight protein identification

Background:

  • The Human Proteome Project (HPP) aims to identify all missing proteins (MPs).
  • Identifying remaining MPs is technically challenging, with decreasing discovery rates.
  • Low-molecular-weight proteins are particularly difficult to detect and characterize.

Purpose of the Study:

  • To develop and validate a comprehensive strategy for enriching, separating, and identifying low-molecular-weight proteins.
  • To discover novel missing proteins (MPs) in human placenta.

Main Methods:

  • Utilized a C18 solid-phase extraction (SPE) column for protein enrichment.
  • Separated proteins using SDS-PAGE or a 50 kDa cutoff filter.
  • Employed trypsin digestion and MS/MS analysis with dual digestion modes (full-trypsin and semi-trypsin).
  • Validated peptide identifications using parallel reaction monitoring (PRM).

Main Results:

  • Identified 4 new MPs with 8 unique peptides.
  • Confirmed 3 MPs from human placenta tissues: TMF-regulated nuclear protein 1, late cornified envelope protein 6A, and insulin growth factor-like family member 2.
  • Validated peptide identifications for 6 out of 8 unique peptides using PRM.
  • The identified proteins range from 80 to 227 amino acids in length.

Conclusions:

  • The developed strategy is effective for analyzing low-molecular-weight proteins.
  • This study contributes to filling the gap in the list of missing proteins.
  • The findings provide a foundation for future proteomic studies targeting low-molecular-weight proteins.