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The minotaur proteome: avoiding cross-species identifications deriving from bovine serum in cell culture models
Jakob Bunkenborg1, Guadalupe Espadas García, Marcia Ivonne Peña Paz
1Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark.
Abstract:
Cell culture is a fundamental tool in proteomics where mammalian cells are cultured in vitro using a growth medium often supplemented with 5-15% FBS. Contamination by bovine proteins is difficult to avoid because of adherence to the plastic vessel and the cultured cells. We have generated peptides from bovine serum using four sample preparation methods and analyzed the peptides by high mass accuracy LC-MS/MS. Distinguishing between bovine and human peptides is difficult because of a considerable overlap of identical tryptic peptide sequences. Pitfalls in interpretation, different database search strategies to minimize erroneous identifications and an augmented contaminant database are presented.
Insights
Bovine protein contamination in cell cultures is a common issue. This study presents methods to identify and minimize bovine peptide contaminants in proteomics research using liquid chromatography-tandem mass spectrometry.
Area of Science:
- Proteomics
- Cell Biology
- Biochemistry
Background:
- Mammalian cell culture is essential for proteomics research.
- Fetal bovine serum (FBS) supplementation in growth media can lead to bovine protein contamination.
- Bovine protein adherence to plasticware and cells complicates contaminant removal.
Purpose of the Study:
- To develop and evaluate methods for identifying bovine protein contaminants in cell culture.
- To address challenges in distinguishing bovine from human peptides.
- To present strategies for minimizing erroneous identifications in proteomics data.
Main Methods:
- Generation of peptides from bovine serum using four distinct sample preparation techniques.
- Analysis of generated peptides via high mass accuracy liquid chromatography-tandem mass spectrometry (LC-MS/MS).
- Comparison of bovine and human tryptic peptide sequences to identify overlaps.
Main Results:
- Significant overlap exists between tryptic peptide sequences of bovine and human origin.
- Four sample preparation methods were assessed for peptide generation from bovine serum.
- LC-MS/MS analysis enabled the detection of bovine peptides.
Conclusions:
- Distinguishing bovine contaminants from endogenous peptides requires careful interpretation.
- Optimized database search strategies are crucial for accurate contaminant identification.
- An augmented contaminant database aids in minimizing false positives in proteomics studies.
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