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Proteomics

Proteomics

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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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

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A proteomics approach to decipher a sticky CHO situation.

Swetha Kumar¹, Amit Kumar², Steven Huhn²

¹Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland, USA.

Biotechnology and Bioengineering

|April 26, 2022

Summary

Chinese hamster ovary (CHO) cells are key for protein therapeutics. Host cell line H1 clones showed 6.8x higher productivity than H2, linked to altered cell adhesion and metabolism pathways.

Keywords:

CHO adhesion fold change analysis pathway analysis proteomics

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Quantitative Analysis of Chromatin Proteomes in Disease

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Area of Science:

Biotechnology
Proteomics
Cell Biology

Background:

Chinese hamster ovary (CHO) cells are widely used for producing protein therapeutics.
Understanding intrinsic host cell line properties is crucial for optimizing protein production and scale-up.

Purpose of the Study:

To compare two CHO host cell lines (H1, H2) and their clones for protein production efficiency.
To identify molecular differences contributing to varying productivity.

Main Methods:

Comparative TMT-proteomics was employed to analyze protein expression profiles.
Fold-change analyses were used to identify differentially regulated pathways and proteins.

Main Results:

CHO host cell line H1 clones exhibited 6.8-fold higher productivity than H2 clones.
Differential regulation was observed in cell adhesion, aggregation, and cellular metabolism pathways.
Podoplanin (antiadhesion molecule) was upregulated in H1, correlating with reduced cell aggregation and surface adhesion.
Key metabolic enzymes, including isocitrate dehydrogenase (IDH) and mitochondrial-d-lactate dehydrogenase (d-LDHm), were differentially regulated.

Conclusions:

Host cell line H1 possesses intrinsic properties favoring higher protein production compared to H2.
Altered cell adhesion and metabolic enzyme regulation are key factors in CHO cell line performance.
Findings provide insights for future cell engineering strategies to enhance CHO cell line productivity.