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Protein Extract Preparation and Co-immunoprecipitation from Caenorhabditis elegans
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Systematic Proteogenomic Approach To Exploring a Novel Function for NHERF1 in Human Reproductive Disorder: Lessons

Keun Na1, Heon Shin2, Jin-Young Cho1

  • 1Yonsei Proteome Research Center, Yonsei University , Seoul 03722, South Korea.

Journal of Proteome Research
|September 30, 2017
PubMed
Summary

This study introduces a proteogenomic approach to identify new functions for human proteins, like NHERF1, which was mislabeled as a missing protein. NHERF1 was found to play a role in trophoblast differentiation and motility, suggesting a novel function in embryonic development.

Keywords:
C-HPPNHERF1SLC9A3R1missing proteinpreeclampsiaproteogenomics

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Area of Science:

  • Proteomics and genomics
  • Human protein identification
  • Cellular function analysis

Background:

  • The Chromosome-Centric Human Proteome Project (C-HPP) aims to bridge gaps between genomic and proteomic data.
  • Missing proteins (MPs) lack sufficient evidence, representing a significant challenge in proteomic research.
  • Inconsistent protein annotations in databases hinder accurate protein identification and functional studies.

Purpose of the Study:

  • To develop and demonstrate a systematic proteogenomic approach for exploring novel functions of ambiguously annotated proteins.
  • To investigate the potential new function of Na+/H+ exchange regulatory cofactor 1 (NHERF1/SLC9A3R1), previously mislabeled as a missing protein.
  • To establish a stepwise platform for characterizing candidate proteins with unclear functional roles.

Main Methods:

  • Mass spectrometry (MS) and immunoblotting were used to confirm the molecular identity of NHERF1.
  • Quantitative MS profiling of placental trophoblasts and functional studies of cytotrophoblast JEG-3 cells were performed.
  • Genetic complementation in Caenorhabditis elegans using the NHERF1 ortholog (nrfl-1) was conducted to validate findings.

Main Results:

  • NHERF1 was confirmed as a non-missing protein with a role in trophoblast differentiation and motility.
  • Functional studies in JEG-3 cells indicated NHERF1's involvement in these cellular processes.
  • Complementation of the C. elegans nrfl-1 mutant with human NHERF1 partially rescued the defective phenotype.

Conclusions:

  • NHERF1 possesses a previously unrecognized function potentially crucial for pregnancy and human embryonic development.
  • The study provides a robust experimental framework for discovering new functions of proteins with ambiguous database annotations.
  • This approach aids in the selection and characterization of missing proteins for future proteomic research.