Identification of Two Genes Coding for the Translation Elongation Factor EF-l* in Saccharomyces Cerevisiae and Analysis of Their Translational Efficiencies After Introduction of Isoacceptor Codon Mutations PDF Download
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Author: Felix Schirmaler
Publisher:
ISBN:
Category :
Languages : en
Pages : 238
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Author: Felix Schirmaler
Publisher:
ISBN:
Category :
Languages : en
Pages : 238
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Author: Mark Gordon Sandbaken
Publisher:
ISBN:
Category :
Languages : en
Pages : 322
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Author: Caitlin E. Gamble
Publisher:
ISBN:
Category :
Languages : en
Pages : 124
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Book Description
Synonymous codon choice modulates translation, but the properties of codons or codon combinations that result in impaired translation are not understood. We scored expression of 35,811 three-codon insertions in GFP in Saccharomyces cerevisiae and evaluated these variants for codon usage and RNA structure effects on GFP fluorescence levels. We have established that codon pairs affect translation elongation and efficiency in yeast in a manner distinct from the effects of individual codon tRNA abundance. Also, similar to previous studies in bacteria, we have found that the base-pairing status of nucleotides near the translation start site is likely to impair translation initiation. Both inhibitory codon pairs and 5’ mRNA structure can impose substantial limitations on translation efficiency through synonymous variation. For 17 inhibitory codon pairs, we show that it is the pair, rather than the dipeptide, the 6-base sequence, or the two individual codons, that is responsible for inhibition. Variants from the GFP insertion library that had an inhibitory pair had significantly lower expression than variants in which: the 6 base sequences were out of frame; the two codons were present but separated; or one of the codons of the pair was instead an optimal codon. We find that the inhibitory pairs act in translation, based on both suppression of inhibition by over expressed tRNA (11/12 tested) and the reduction in translation speeds relative to synonymous dipeptide sequences, as observed from ribosome occupancies along yeast transcripts. Furthermore, for 12 of the 17 pairs, preserving the order of codons in the pair was required for strong inhibitory effects. Thus the position of inhibitory pairs within the ribosome is likely a key factor in translation efficiency. Moreover, the identity of codons in inhibitory pairs is inconsistent with an inhibition mechanism governed primarily by limited tRNA supply. Rather, our data implicates wobble decoding and interactions between adjacent sites in the ribosome. The high-throughput experimental analysis described here has resulted in the direct and extensive identification of multiple inhibitory codon pairs, a quantitative analysis of their relative effects on translation in vivo, and tests of their activity as modulators of translation.
Author: Boris Zinshteyn
Publisher:
ISBN:
Category :
Languages : en
Pages : 159
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The goal of this thesis is to elucidate the mechanisms that govern translational efficiency (TE) - the amount of protein produced from each molecule of mRNA. While the mechanisms regulating the TE of a few specific messages are well understood, the general contribution of translational control to differences in cellular protein levels is currently unclear. Recent advances have enabled the direct measurement of protein levels and translation rates genome-wide, and studies in multiple organisms have found varying degrees of translation regulation, both at steady state, and in response to stress or developmental cues. Despite this influx of high-throughput data, the mechanisms underlying the differences in gene-specific and condition-dependent TE remain largely unknown. In this thesis, I describe the roles of two different components of the translational machinery in regulating translational efficiency. In Chapter 1, I discuss the features of mRNA coding sequences that can affect TE, thereby introducing Chapter 2, in which I investigate the role of a conserved anticodon tRNA modification in determining the rate of translation elongation and the phenotypic consequences of its loss for budding yeast. In Chapter 3, I discuss the regulation of translation initiation to introduce Chapter 4, in which I explore how the RNA binding specificity of the core translation factor, yeast eukaryotic initiation factor 4G (eIF4G), contributes to genome-wide competition between mRNAs. Finally, I will discuss future directions for this work.
Author: Chia-Lin Wei (Ph.D. in microbiology)
Publisher:
ISBN:
Category :
Languages : en
Pages : 422
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Author: Shōzō Ōsawa
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 240
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The genetic code was deciphered experimentally around 1966 and for a number of years scientists considered it to be "universal" for all forms of life. In 1981 researchers shocked the scientific community with the discovery that the code differed in mitochondria and certain other organisms, evidence that the genetic code was still evolving. This book discusses the distribution and origin of the non-universal codes and examines the possible mechanisms of code changes, making it essential reading for all those interested in evolutionary genetics.
Author: David Freifelder
Publisher: Macmillan
ISBN: 9780716714446
Category : Medical
Languages : en
Pages : 786
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Book Description
Suitable for advanced undergraduate and graduate students in biochemistry, this book provides clear, concise, well-exampled descriptions of the physical methods that biochemists and molecular biologists use.
Author: Xuhua Xia
Publisher: Springer Science & Business Media
ISBN:
Category : Science
Languages : en
Pages : 376
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Book Description
Biological and biomedical sciences are becoming more interdisciplinary, and scientists of the future need inte rdisciplinary training instead of the conventional disciplinary training. Just as Sean Eddy (2005) wiselypointed out that sending monolingual diplomats to the United Nations maynot enhance international collaborations, combining strictly disciplinary scientists trained in either mathematics, computational science or molecular biology will not create a productive inte rdisciplinary team ready to solve interdisciplinary problems. Molecular biology is an interdiscip linary science back in its heyday, and founders of molecular biology were ofte n interdisciplinary scientists. Indeed, Francis Crick considered himself as “a mixture of crystallographer, biophysicist, biochemist, and geneticist” (Crick, 1965). Because it was too cumbersome to explain to people that he was such a mixture, the term “molecular biologist” came handy. To get the crystallographer, biophysicist, biochemist, and geneticist within hi mself to collaborate with each other probably worked better than a team with a crystallographer, a biophysicist, a biochemist and a geneticist who maynot even be interested in each other’s problems.
Author: Shmuel Razin
Publisher: Springer Science & Business Media
ISBN: 0306476061
Category : Science
Languages : en
Pages : 574
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Book Description
was the result of the efforts of Robert Cleverdon. The rapidly developing discipline of molecular biology and the rapidly expanding knowledge of the PPLO were brought together at this meeting. In addition to the PPLO specialists, the conference invited Julius Marmur to compare PPLO DNA to DNA of other organisms; David Garfinkel, who was one of the first to develop computer models of metabolism; Cyrus Levinthal to talk about coding; and Henry Quastler to discuss information theory constraints on very small cells. The conference was an announcement of the role of PPLO in the fundamental understanding of molecular biology. Looking back 40-some years to the Connecticut meeting, it was a rather bold enterprise. The meeting was international and inter-disciplinary and began a series of important collaborations with influences resonating down to the present. If I may be allowed a personal remark, it was where I first met Shmuel Razin, who has been a leading figure in the emerging mycoplasma research and a good friend. This present volume is in some ways the fulfillment of the promise of that early meeting. It is an example of the collaborative work of scientists in building an understanding of fundamental aspects of biology.
Author: Heinz Bielka
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3112729757
Category : Science
Languages : en
Pages : 340
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Book Description
No detailed description available for "The Eukaryotic Ribosome".
