Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 30, Problem 7P
Interpretation Introduction
Interpretation:
The amino acids those are most likely to be incorporated by nonsense suppressor mutants should be determined.
Concept Introduction:
The genetic code comprises of 64 or 43 dissimilar options for codons. Three of these combination accounts to stop codons and 61 of these codes for a precise tRNA carrying a precise amino acid.
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4
Given the following diagram of how protein AWESOME1 binds to it's target DNA, describe the
potential effects of each of the 5 mutations shown below. The wild-type sequence of a helix #1
is also shown in the blue box, and all the mutations are in helix #1 (see numbers for identifying
particular residues).
a helix #1
R(1)-V-I-L-Y-F-W-I-M-Y-F-S-H-Y-W-R(16)
#1
Predict the consequence of the following
mutations:
1) Arg(1) to Glu
2) Arg(1) to Ala
3) Phe(6) to lle
4) Trp(7) to Phe
5) Met(9) to Pro
in
The following RNA sequence represents a small messenger which can be translated in a prokaryotic cell:
5'-ACGAAUGCACAGUAAAACUGGCUAGCGUAGGCUGA-3
Assume that the messenger RNA is translated in the cell, using the correct machinery and signals
required for accurate protein synthesis. Using this RNA sequence and the Genetic Code Dictionary (see
your textbook for the dictionary), solve the following problems
A. Write the sequence of a protein that would be translated from this mRNA, using the appropriate stop and start
signals, and indicating the correct termini of the protein product.
B. Suppose that the underlined A in the sequence is changed to a U. Write the expected protein product of this
mRNA.
Chapter 30 Solutions
Biochemistry
Ch. 30 - Prob. 1PCh. 30 - Prob. 2PCh. 30 - The Second Genetic Code Review the evidence...Ch. 30 - Codon-Anticodon Recognition: Base-Pairing...Ch. 30 - Consequences of the Wobble Hypothesis Point out...Ch. 30 - Prob. 6PCh. 30 - Prob. 7PCh. 30 - Prob. 8PCh. 30 - Prob. 9PCh. 30 - The Consequences of Ribosome Complexity Eukaryotic...
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- The following is a portion of a protein: met-trp-tyr-arg-gly-pro-thr-Various mutant forms of this protein have been recovered. Using the normal and mutant sequences, determine the DNA and mRNA sequences that code for this portion of the protein, and explain each of the mutations. a. met-trp- b. met-cys-ile-val-val-leu-gln- c. met-trp-tyr-arg-ser-pro-thr- d. met-trp-tyr-arg-gly-ala-val-ile-ser-pro-thr-arrow_forwardOxytocin is a small peptide hormone. It contains a nine amino acid sequence shown below: CYIQNCPLG 33 How many nucleotides would be found in the mRNA for this protein? Suggest an mRNA sequence for the peptide. Write in as 5' XXX 3' (no spaces between nucleotides). Keep in mind, for a protein to be synthesized it needs to include a start codon and a stop codon. Suggest a complementary template DNA sequence based on the MRNA sequences suggested above. Write in as 3' XXX 5' (no spaces between nucleotides).arrow_forwardTable 8.2 Codons in mRNA molecule and their corresponding amino acids UUU UUA GCA AAG GOU O nonsense Oleucine Refer to Table 8.2. UAU codes for which amino acid? O lysine O alanine Phenylalanine UAU leucine UAA alanine lysine valine UCG, UCU O tyrosine AAU UGC tyrosine nonsense asparagine cysteine serinearrow_forward
- 2a) Suppose you have a gene in which a single base substitution has created the nonsense mutation 5'TAA3' (which will be transcribed into 5'UAA3' in the mRNA - but recall that mutations are changes in the DNA sequence). Name all the amino acids that could have been coded for by the original, unmutated codon at that position in the gene.arrow_forwardIn HbS, the human hemoglobin found in individuals with sickle-cell anemia, glutamic acid at position 6 in the beta chain is replaced by valine. Q.) Show that one of the glutamic acid codons can be converted to a valine codon by a single substitution mutation (i.e., by changing one letter in one codon).arrow_forwardMRNA CODONS RESPONSIBLE FOR LINING UP EACH OF THE 20 AMINO ACIDS Amino Acid Code-End of the MRNA Codons* (anticodon) tRNA Alanine GCU Arginine Asparagine Aspartic Acid Cysteine Glutamic Acid AGA AAU GAU UGU GAA Glutamine CAA Glycine Histidine GGU CAU Isoleucine AUU Leucine CUU Lysine Methionine AAA AUG Phenylalanine Proline UUU CCU Serine UCU Threonine ACU Tryptophan Tyrosine Valine UGG UAU GUA * There are 64 codons. Some amino acids have several mRNA codons. There is, however, no overlap of codes. 1. You should be able to fill in the 3-letter "code-end" of the tRNA molecules in the table above. Remember, in RNA A pairs with U, and G pairs with C. There is no thymine. Fill in the table.arrow_forward
- The average molecular weight of a protein in the cell is about 30,000 daltons. A few proteins, however, are much larger. the largest known polypeptide chain made by any cell is a protein called titin (made by mammalian muscle cells), and it has a molecular weight of 3,000,000 daltons. estimate how long it will take a muscle cell to translate an mRNA coding for titin (assume the average molecular weight of an amino acid to be 120, and a translation rate of two amino acids per second for eukaryotic cells).arrow_forwardMRNA CODONS RESPONSIBLE FOR LINING UP EACH OF THE 20 AMINO ACIDS Code-End of the Amino Acid MRNA Codons* (anticodon) tRNA Alanine GCU AGA Arginine Asparagine Aspartic Acid Cysteine Glutamic Acid Glutamine Glycine Histidine AAU GAU UGU GAA CAA GGU CAU AUU CUU AAA AUG Isoleucine Leucine Lysine Methionine UUU Phenylalanine Proline CCU UCU Serine ACU UGG Threonine Tryptophan Tyrosine Valine UAU GUA There are 64 codons. Some amino acids have several mRNA codor There is, however, no overlap of codes.arrow_forward. Why is a nonsense suppressor tRNATyr, even though ithas a mutant anticodon that cannot recognize a tyrosinecodon, charged with tyrosine by Tyr tRNA synthetase?arrow_forward
- Hand written solutions are strictly prohibited.arrow_forwardA 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 witharrow_forwardThere are four codons that encode threonine. Consider the leader sequence in Figure 31.22A. What codons are used and with what frequency?arrow_forward
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