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DNA, RNA and Protein Synthesis
DNA, RNA and Protein Synthesis

... IV. Translation (Converting the “language” of mRNA to the language of proteins.) Codon= triplet of nitrogen bases on mRNA ...
2.4 Molecules to Metabolism NOTES - Proteins
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U - West Windsor-Plainsboro Regional School District
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... Towards a ‘universal’ nucleant for protein crystallization Naomi’s Nucleants have facilitated the crystallization of 14 proteins, the highest number reported for any single nucleant. Many of these proteins have proven difficult to crystallize and some of these, including membrane proteins, have only ...
Word Doc - Live Life, Love Fitness
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Transcription Factors Dial 14-3-3 for Nuclear Shuttle
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... Cdc25:GFP to the nucleus. Thus, it appears that binding of 14-3-3s controls the intracellular localization of Cdc25 in Xenopus in a manner that is very similar, if not identical, to that of RSG localization in plant cells. Kumagai and Dunphy (1999) hypothesized that Cdc25 shuttles continually betwee ...
Chapter 12-3: RNA and Protein Synthesis
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Chapter 4
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PRACTICE EXAM ANSWERS 2007 1. A. Essentially
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... C. You would expect the RNA polymerase to have β, β’, α, and ω subunits which are all part of core RNA polymerase to be the same. However, the σ subunits would be different. Note for the extra credit: The patterns would look like this: D. You need to use an expression microarray in order to answer t ...
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... Next higher level of complexity - folding of the a-helical and/or b-pleated regions H-bonding, dipole-dipole interactions, London dispersion forces, disulfide bridges ...
RNA and Protein Synthesis - Port Washington School District
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... acids to the ribosomes where they are eventually assembled into protein chains – Each amino acid is coded for by a different triplet codon on mRNA – tRNA has an anticodon that will pair up with codon on mRNA ...
Gene regulation in Bacteria
Gene regulation in Bacteria

... A translational regulatory protein recognizes sequences within the mRNA. In most cases, these proteins act to inhibit translation. These are known as translational repressors. Translational repressors inhibit translation in one of two ways: - Binding next to the Shine-Dalgarno sequence and/or the st ...
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SR protein



SR proteins are a conserved family of proteins involved in RNA splicing. SR proteins are named because they contain a protein domain with long repeats of serine and arginine amino acid residues, whose standard abbreviations are ""S"" and ""R"" respectively. SR proteins are 50-300 amino acids in length and composed of two domains, the RNA recognition motif (RRM) region and the RS binding domain. SR proteins are more commonly found in the nucleus than the cytoplasm, but several SR proteins are known to shuttle between the nucleus and the cytoplasm.SR proteins were discovered in the 1990s in Drosophila and in amphibian oocytes, and later in humans. In general, metazoans appear to have SR proteins and unicellular organisms lack SR proteins.SR proteins are important in constitutive and alternative pre-mRNA splicing, mRNA export, genome stabilization, nonsense-mediated decay, and translation. SR proteins alternatively splice pre-mRNA by preferentially selecting different splice sites on the pre-mRNA strands to create multiple mRNA transcripts from one pre-mRNA transcript. Once splicing is complete the SR protein may or may not remain attached to help shuttle the mRNA strand out of the nucleus. As RNA Polymerase II is transcribing DNA into RNA, SR proteins attach to newly made pre-mRNA to prevent the pre-mRNA from binding to the coding DNA strand to increase genome stabilization. Topoisomerase I and SR proteins also interact to increase genome stabilization. SR proteins can control the concentrations of specific mRNA that is successfully translated into protein by selecting for nonsense-mediated decay codons during alternative splicing. SR proteins can alternatively splice NMD codons into its own mRNA transcript to auto-regulate the concentration of SR proteins. Through the mTOR pathway and interactions with polyribosomes, SR proteins can increase translation of mRNA.Ataxia telangiectasia, neurofibromatosis type 1, several cancers, HIV-1, and spinal muscular atrophy have all been linked to alternative splicing by SR proteins.
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