Published online 17 February 2005
Article |
Relative predicted protein levels of functionally associated proteins are conserved across organisms
Department of Molecular Genetics and Biotechnology, The Faculty of Medicine, The Hebrew University Jerusalem 91120, Israel
*To whom correspondence should be addressed. Tel: +972 2 6758614; Fax: +972 2 6757308; Email: hanah{at}md.huji.ac.il
Received January 3, 2005. Revised February 1, 2005. Accepted February 1, 2005.
We show that the predicted protein levels of functionally related proteins change in a coordinated fashion over many unicellular organisms. For each protein, we created a profile containing a protein abundance measure in each of a set of organisms. We show that for functionally related proteins these profiles tend to be correlated. Using the Codon Adaptation Index as a predictor of protein abundance in 48 unicellular organisms, we demonstrated this phenomenon for two types of functional relations: for proteins that physically interact and for proteins involved in consecutive steps within a metabolic pathway. Our results suggest that the protein abundance levels of functionally related proteins co-evolve.
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