Oxygen Content in Membrane Proteins and Cell Compartmentalization
Author Information
Author(s): Sasidharan Rajkumar, Smith Andrew, Gerstein Mark
Primary Institution: Yale University
Hypothesis
Transmembrane proteins in ancient taxa were selectively excluding oxygen, and as atmospheric oxygen levels increased, the size and number of communication-related transmembrane proteins increased.
Conclusion
Compartmentalized and non-compartmentalized cells can be distinguished by how oxygen is partitioned at the proteome level, but this distinction is not absolute based on a larger sample of taxa.
Supporting Evidence
- The study extended previous research by analyzing a larger sample of taxa.
- It was found that about 50% of eukaryotes overlap with the range of prokaryotes in terms of oxygen partitioning.
- The original conclusion about the separation of compartmentalized and non-compartmentalized cells was not supported by the larger dataset.
Takeaway
Scientists studied how oxygen is used in proteins that help cells communicate, and found that while there are some differences between types of cells, you can't always tell them apart just by looking at how they handle oxygen.
Methodology
The study analyzed complete proteomes of 309 eubacteria, 34 archaea, and 30 eukaryotes to calculate the mean oxygen content of protein sequences and predict transmembrane protein topology.
Potential Biases
The genomes used in the original analysis may not represent the broader diversity of life.
Limitations
The original analysis may be biased as it was based on a smaller sample size of 19 taxa.
Digital Object Identifier (DOI)
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