Evolving Bacterial Fitness with an Expanded Genetic Code
نویسندگان
چکیده
منابع مشابه
Protein evolution with an expanded genetic code.
We have devised a phage display system in which an expanded genetic code is available for directed evolution. This system allows selection to yield proteins containing unnatural amino acids should such sequences functionally outperform ones containing only the 20 canonical amino acids. We have optimized this system for use with several unnatural amino acids and provide a demonstration of its ut...
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With few exceptions the genetic codes of all known organisms encode the same 20 amino acids, yet all that is required to add a new building block are a unique tRNA/aminoacyl-tRNA synthetase pair, a source of the amino acid, and a unique codon that specifies the amino acid. For example, the amber nonsense codon, TAG, together with orthogonal Methanococcus jannaschii or Escherichia coli tRNA/synt...
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Bioengineering advances have made it possible to fundamentally alter the genetic codes of organisms. However, the evolutionary consequences of expanding an organism's genetic code with a noncanonical amino acid are poorly understood. Here we show that bacteriophages evolved on a host that incorporates 3-iodotyrosine at the amber stop codon acquire neutral and beneficial mutations to this new am...
متن کاملEvolving genetic code
In 1985, we reported that a bacterium, Mycoplasma capricolum, used a deviant genetic code, namely UGA, a "universal" stop codon, was read as tryptophan. This finding, together with the deviant nuclear genetic codes in not a few organisms and a number of mitochondria, shows that the genetic code is not universal, and is in a state of evolution. To account for the changes in codon meanings, we pr...
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We found that Methanocaldococcus jannaschii DSM2661 tyrosyl-tRNA synthetase (Mj E9RS), specifically evolved to charge its cognate tRNA with the unnatural amino acid p-acetylphenylalanine (pAcF) in E. coli, misaminoacylates the endogenous E. coli prolyl-tRNAs with pAcF at a low level (0.5% per proline frequency) in both the absence or presence of its co-evolved amber suppressor tRNA (M. jannasch...
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ژورنال
عنوان ژورنال: Scientific Reports
سال: 2018
ISSN: 2045-2322
DOI: 10.1038/s41598-018-21549-w