Results 261 to 270 of about 494,112 (301)
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Origins of life and evolution of the biosphere, 1999
Several hypotheses on the origin of codon assignments imply that the present protein synthesizing machinery was already in place when the assignments were made. These are examined by computer modeling. The results do not suggest that assignments were optimized for resistance to reading and mutation errors, nor that the assignments are random.
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Several hypotheses on the origin of codon assignments imply that the present protein synthesizing machinery was already in place when the assignments were made. These are examined by computer modeling. The results do not suggest that assignments were optimized for resistance to reading and mutation errors, nor that the assignments are random.
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Codon optimizer: a freeware tool for codon optimization
Protein Expression and Purification, 2003Selection plays a major role in the determination of codon usage in all organisms studied so far. In highly expressed genes, a narrow set of codons is used and these codons correspond to the more abundant tRNA species. This minimizes the risk of tRNA depletion during translation.
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An effect of codon context on the mistranslation of UGU codons in vitro
Journal of Molecular Biology, 1984Effects of codon context on nonsense codon suppression may act either through release factor recognition of termination codons or aminoacyl-tRNA selection by the ribosome. The latter hypothesis has been studied by comparing misreading by Escherichia coli UGA suppressor tryptophan tRNA of UGU (cysteine) codons in two synthetic polymers, poly(U-G) and ...
M J, Carrier, R H, Buckingham
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Identification of the UUG codon as a translational initiation codon in vivo
Journal of Molecular Biology, 1975Abstract The lac repressor protein was purified from an Escherichia coli strain carrying an amber mutation in the lacI gene and the tyrosine-inserting amber suppressor, Su3. Protein sequencing showed a change at position 62 in the repressor polypeptide chain from leucine to tyrosine, proving that the amber was derived from a UUG codon at this ...
J G, Files +3 more
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Codon bias from minimization of codon–anticodon interaction
Biosystems, 2016Inequalities between codon usage probabilities for quartets of codons are derived using a minimum principle for codon-anticodon interaction and a probability sum rule in the framework of the Crystal Basis Model of the genetic code. Performing this study separately for the Early and for the Eukaryotic Genetic Code, we observe a consistency in the ...
Sciarrino, Antonino, Sorba, Paul
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Tandem Stop Codons in Ciliates That Reassign Stop Codons
Journal of Molecular Evolution, 2009Tandem stop codons are extra stop codons hypothesized to be present downstream of genes to act as a backup in case of read-through of the real stop codon. Although seemingly absent from Escherichia coli, recent studies have confirmed the presence of such codons in yeast.
Marie, Adachi, Andre R O, Cavalcanti
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Synthesis at the Speed of Codons
Trends in Biochemical Sciences, 2015The possibility that different mRNA sequences encoding identical peptides are translated dissimilarly has long been of great interest. Recent work by Yu and co-workers provides striking evidence that mRNA sequences influence the rate of protein synthesis, and lends support to the emerging idea that mRNA sequence informs protein folding.
Kristin S, Koutmou +2 more
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Writing Scrapie's Coda, Codon by Codon?
Science, 2000Over the past decade, geneticists have found that different variations, or polymorphisms, in the gene coding for PrP--a cellular protein that many scientists believe becomes infectious when it converts to an abnormal form called a prion--seem to confer varying degrees of susceptibility to scrapie.
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Computational Biology and Chemistry, 2007
We develop here an analytical evolution model based on a trinucleotide mutation matrix 64x64 with nine substitution parameters associated with the three types of substitutions in the three trinucleotide sites and with non-zero elements on its main diagonal.
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We develop here an analytical evolution model based on a trinucleotide mutation matrix 64x64 with nine substitution parameters associated with the three types of substitutions in the three trinucleotide sites and with non-zero elements on its main diagonal.
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