Predicting the Minimal Translation Apparatus: Lessons from the Reductive Evolution of


In all cells, proteins are synthesized from the message encoded by mRNA using complex machineries involving many proteins and RNAs. In this process, named translation, the ribosome plays a central role. The elements involved in both ribosome biogenesis and its function are extremely conserved in all organisms from the simplest bacteria to mammalian cells. Most of the 260 known proteins involved in translation have been identified and studied in the bacteria Escherichia coli and Bacillus subtilis, two common cellular models in biology. However, comparative genomics has shown that the translation protein set can be much smaller. This is true for bacteria belonging to the class Mollicutes that are characterized by reduced genomes and hence considered as models for minimal cells. Using homology inference approach and expert analyses, we identified the translation apparatus proteins for 39 of these organisms. Although striking variations were found from one group of species to another, some Mollicutes species require half as many proteins as E. coli or B. subtilis. This analysis allowed us to determine a set of proteins necessary for translation in Mollicutes and define the translation apparatus that would be required in a cellular chassis mimicking a minimal bacterial cell.


Vyšlo v časopise: Predicting the Minimal Translation Apparatus: Lessons from the Reductive Evolution of. PLoS Genet 10(5): e32767. doi:10.1371/journal.pgen.1004363
Kategorie: Research Article
prolekare.web.journal.doi_sk: 10.1371/journal.pgen.1004363

Souhrn

In all cells, proteins are synthesized from the message encoded by mRNA using complex machineries involving many proteins and RNAs. In this process, named translation, the ribosome plays a central role. The elements involved in both ribosome biogenesis and its function are extremely conserved in all organisms from the simplest bacteria to mammalian cells. Most of the 260 known proteins involved in translation have been identified and studied in the bacteria Escherichia coli and Bacillus subtilis, two common cellular models in biology. However, comparative genomics has shown that the translation protein set can be much smaller. This is true for bacteria belonging to the class Mollicutes that are characterized by reduced genomes and hence considered as models for minimal cells. Using homology inference approach and expert analyses, we identified the translation apparatus proteins for 39 of these organisms. Although striking variations were found from one group of species to another, some Mollicutes species require half as many proteins as E. coli or B. subtilis. This analysis allowed us to determine a set of proteins necessary for translation in Mollicutes and define the translation apparatus that would be required in a cellular chassis mimicking a minimal bacterial cell.


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