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- Once the chains of peptides that make up lysyl-tRNA synthetase protein are synthesized in ribosomes, lysyl-tRNA synthetase needs to have the proper active site in order to perform its function, explain the process of protein folding necessary to have a proper 3-D structure, include effect of thermodynamics and different states in folding, including what happen when there are prolines that form peptide bonds with other amino acids, and any disulfide bridgesMany blood clotting proteins undergo a post-translational modification in which specific glutamic acid residues (Glu) in the protein are converted to gamma-carboxyglutamic acid residues (Gla). See reaction scheme below. An example is the blood clotting protein Factor IX, which has 12 Glu in its N-terminus converted to Gla. This modification gives Factor IX the ability to bind calcium and phospholipid membranes. Bacteria do not have the enzyme required to convert Glu to Gla and therefore Factor IX proteins expressed in bacteria would not have the proper modifications. How might you engineer the translational apparatus of a bacterial cell line so that it produces Factor IX with Gla in the appropriate positions. How would you ensure that only the 12 Glu in Factor IX that are normally converted to Gla and not just all Glu (Limit 5-6 senetnces)?Question 28 Introns Protein-coding sequences that need to be excised B Non-coding regions that need to be excised Protein-coding sequences that form part of the mature MRNA Non-coding regions that form part of the mature MRNA Question 29 Anomers are A Either the open chain structure or the cyclic structure, established through mutarotation B) Either L or D Cyclic monosaccharides that differ only in the positions of substituents at carbon (alpha or beta) The fifteen other stereoisomers of glucose Question 30 The nuclear lamina A is the site of ribosomal RNA (FRNA) synthesis maintains the shape of the nucleus encloses the nucleus to separate it from the cytoplasm D) regulates the entry and exit of molecules from the nucleus
- One single polypeptide chain (120 amino acid residues) is produced for protein A in prokaryotic cell. N-terminal amino acid is alanine in the chain of this protein. How many moles of ATP and GTP will be in use for this polypeptide chain synthesis? What post-translational modifications may be for this protein?Discuss the key factors & mechanisms during co-translational translocation by which START TRANSFER and STOP TRANSFER sequences help the protein generate appropriate number of transmembrane regions with N or C terminal on the designated side of the plasma membrane.(NO PLAGIARISM)What are the functional consequences of this deletion for lilP mRNA transcription and translation? (100 words max.)
- A poison added to an in vitro translation mixture containing mRNA molecules with the sequence 5'- AUGAAAAAAAAAAAAUAA-3' has the following effect: the only product made is a Met-Lys dipeptide that remains attached to the ribosome. What is the most likely way in which the poison acts to inhibit protein synthesis? It mimics a methionine tRNA. O It inhibits stop proteins from entering the ribosome O It inhibits movement of translocation so it can't empty the P-site O It inhibits the P site from accepting a tRNA to begin withMany clinically relevant mitochondrial diseases are caused by mutations in mitochondrial genes affecting tRNAs. For example, one form of MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes) is caused by a point mutation in the gene encoding the mitochondrial tRNA whose anticodon recognizes the codons 5' UUA and 5' UUG. The mutation makes the aminoacylation of this tRNA inefficient. a. The rate of synthesis of most mitochondrial proteins is either unaffected or slightly decreased in MELAS cells, but one mitochondrial protein called NAD6 is synthesized at only 10% of the normal rate. How is it possible that the translation of this single mitochondrial protein might be affected specifically?Briefly discuss (referring to the images provided) why mutant 2 fails to produce functional protein. Note that none of the mRNA transcribed from this gene is of the expected size; some of the mRNA molecules produced are 223 nucleotides shorter than expected, whilst others are 47 nucleotides longer than expected.
- Original sequence: Consider the following coding 71 nucleotide DNA template sequence (It does not contain a translational start): 5’-GTTTCCCCTATGCTTCATCACGAGGGCACTGACATGTGTAAACGAAATTCCAACCTGAGCGGCGT GTTGAG-3’ Question: 4) In a mutant you discovered that the underlined nucleotide has been deleted. What would the resulting peptide sequence be? What type of mutation is this? 5’-GTTTCCCCTATGCTTCATCACGAGGGCACTGACATGTGTAAACGAAATTCCAACCTGAGCGGCGT GTTGAG-3Which statements are true? Explain why or why not.1 The consequences of errors in transcription areless severe than those of errors in DNA replication.2 Since introns are largely genetic “junk,” they do nothave to be removed precisely from the primary transcriptduring RNA splicing.3 Wobble pairing occurs between the first positionin the codon and the third position in the anticodon.4 During protein synthesis, the thermodynamics ofbase-pairing between tRNAs and mRNAs sets the upperlimit for the accuracy with which protein molecules aremade.5 Protein enzymes are thought to greatly outnum-ber ribozymes in modern cells because they can catalyzea much greater variety of reactions and all of them havefaster rates than any ribozyme.Answer codon usage based on this description: You have isolated a new eukaryotic microorganism and want to determine the genetic code of its mitochondria. Here are the amino acids encoded after translation of two synthetic mRNAs using mitochondrial extracts from your eukaryote- in this experiment translation can start at any sequence position: RNA: Protein: Tyr-Met-Tyr-Met-Tyr-Met---- UAUAUAUAUAUAUAU--- UAAUAAUAAUAAUAA--- Asn-Asn-Asn-Asn-Asn---- Met-Met-Met-Met-Met---- Based on the results shown here, what can you conclude about the codons in this eukaryote? A. B. C. D. O A O C OD OB AUA Tyr Met Tyr Met UAU Met Tyr Met Tyr AAU Met Trp Asn UAA Asn Asn Asn Asn, STOP or Met Asn, STOP or Met